ID SUSE-SU-2017:1635-1 Type suse Reporter Suse Modified 2017-06-21T18:11:05
Description
This update for openvpn fixes the following issues:
Some parts of the certificate-parsing code did not always clear all
allocated memory. This would have allowed clients to leak a few bytes of
memory for each connection attempt, thereby facilitating a (quite
inefficient) DoS attack on the server. [bsc#1044947, CVE-2017-7521]
The ASN1 parsing code contained a bug that could have resulted in some
buffers being free()d twice, and this issue could have potentially been
triggered remotely by a VPN peer. [bsc#1044947, CVE-2017-7521]
If clients used a HTTP proxy with NTLM authentication, a
man-in-the-middle attacker between client and proxy could cause the
client to crash or disclose at most 96 bytes of stack memory. The
disclosed stack memory was likely to contain the proxy password. If the
proxy password had not been reused, this was unlikely to compromise the
security of the OpenVPN tunnel itself. Clients who did not use the
--http-proxy option with ntlm2 authentication were not affected.
[bsc#1044947, CVE-2017-7520]
It was possible to trigger an assertion by sending a malformed IPv6
packet. That issue could have been abused to remotely shutdown an
openvpn server or client, if IPv6 and --mssfix were enabled and if the
IPv6 networks used inside the VPN were known. [bsc#1044947,
CVE-2017-7508]
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"packageFilename": "openvpn-2.3.8-16.17.1.ppc64le.rpm", "packageName": "openvpn", "operator": "lt", "arch": "ppc64le", "OSVersion": "12.1"}, {"OS": "SUSE Linux Enterprise Server", "packageVersion": "2.3.8-16.17.1", "packageFilename": "openvpn-debuginfo-2.3.8-16.17.1.ppc64le.rpm", "packageName": "openvpn-debuginfo", "operator": "lt", "arch": "ppc64le", "OSVersion": "12.2"}, {"OS": "SUSE Linux Enterprise Server", "packageVersion": "2.3.8-16.17.1", "packageFilename": "openvpn-auth-pam-plugin-debuginfo-2.3.8-16.17.1.ppc64le.rpm", "packageName": "openvpn-auth-pam-plugin-debuginfo", "operator": "lt", "arch": "ppc64le", "OSVersion": "12.2"}, {"OS": "SUSE Linux Enterprise Server LTSS", "packageVersion": "2.3.8-16.17.1", "packageFilename": "openvpn-debuginfo-2.3.8-16.17.1.s390x.rpm", "packageName": "openvpn-debuginfo", "operator": "lt", "arch": "s390x", "OSVersion": "12"}, {"OS": "SUSE Linux Enterprise Server LTSS", "packageVersion": "2.3.8-16.17.1", "packageFilename": "openvpn-auth-pam-plugin-2.3.8-16.17.1.s390x.rpm", "packageName": "openvpn-auth-pam-plugin", "operator": "lt", "arch": "s390x", "OSVersion": "12"}, {"OS": "SUSE Linux Enterprise Desktop", "packageVersion": "2.3.8-16.17.1", "packageFilename": "openvpn-debugsource-2.3.8-16.17.1.x86_64.rpm", "packageName": "openvpn-debugsource", "operator": "lt", "arch": "x86_64", "OSVersion": "12.2"}, {"OS": "SUSE OpenStack Cloud", "packageVersion": "2.3.8-16.17.1", "packageFilename": "openvpn-debugsource-2.3.8-16.17.1.x86_64.rpm", "packageName": "openvpn-debugsource", "operator": "lt", "arch": "x86_64", "OSVersion": "6"}, {"OS": "SUSE Linux Enterprise Server for SAP", "packageVersion": "2.3.8-16.17.1", "packageFilename": "openvpn-auth-pam-plugin-2.3.8-16.17.1.x86_64.rpm", "packageName": "openvpn-auth-pam-plugin", "operator": "lt", "arch": "x86_64", "OSVersion": "12"}, {"OS": "SUSE OpenStack Cloud", "packageVersion": "2.3.8-16.17.1", "packageFilename": "openvpn-2.3.8-16.17.1.x86_64.rpm", "packageName": "openvpn", "operator": "lt", "arch": "x86_64", "OSVersion": "6"}], "viewCount": 6, "reporter": "Suse", "references": ["https://bugzilla.suse.com/1044947"], "description": "This update for openvpn fixes the following issues:\n\n - Some parts of the certificate-parsing code did not always clear all\n allocated memory. This would have allowed clients to leak a few bytes of\n memory for each connection attempt, thereby facilitating a (quite\n inefficient) DoS attack on the server. [bsc#1044947, CVE-2017-7521]\n\n - The ASN1 parsing code contained a bug that could have resulted in some\n buffers being free()d twice, and this issue could have potentially been\n triggered remotely by a VPN peer. [bsc#1044947, CVE-2017-7521]\n\n - If clients used a HTTP proxy with NTLM authentication, a\n man-in-the-middle attacker between client and proxy could cause the\n client to crash or disclose at most 96 bytes of stack memory. The\n disclosed stack memory was likely to contain the proxy password. If the\n proxy password had not been reused, this was unlikely to compromise the\n security of the OpenVPN tunnel itself. Clients who did not use the\n --http-proxy option with ntlm2 authentication were not affected.\n [bsc#1044947, CVE-2017-7520]\n\n - It was possible to trigger an assertion by sending a malformed IPv6\n packet. That issue could have been abused to remotely shutdown an\n openvpn server or client, if IPv6 and --mssfix were enabled and if the\n IPv6 networks used inside the VPN were known. 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This would have allowed clients to leak a few bytes of\n memory for each connection attempt, thereby facilitating a (quite\n inefficient) DoS attack on the server. [bsc#1044947, CVE-2017-7521]\n\n - The ASN1 parsing code contained a bug that could have resulted in some\n buffers being free()d twice, and this issue could have potentially been\n triggered remotely by a VPN peer. [bsc#1044947, CVE-2017-7521]\n\n - If clients used a HTTP proxy with NTLM authentication, a\n man-in-the-middle attacker between client and proxy could cause the\n client to crash or disclose at most 96 bytes of stack memory. The\n disclosed stack memory was likely to contain the proxy password. If the\n proxy password had not been reused, this was unlikely to compromise the\n security of the OpenVPN tunnel itself. Clients who did not use the\n --http-proxy option with ntlm2 authentication were not affected.\n [bsc#1044947, CVE-2017-7520]\n\n - It was possible to trigger an assertion by sending a malformed IPv6\n packet. That issue could have been abused to remotely shutdown an\n openvpn server or client, if IPv6 and --mssfix were enabled and if the\n IPv6 networks used inside the VPN were known. [bsc#1044947,\n CVE-2017-7508]\n\n\n This update was imported from the SUSE:SLE-12:Update update project.\n\n", "modified": "2017-06-26T15:16:30", "published": "2017-06-26T15:16:30", "href": "http://lists.opensuse.org/opensuse-security-announce/2017-06/msg00031.html", "id": "OPENSUSE-SU-2017:1680-1", "title": "Security update for openvpn (important)", "type": "suse", "cvss": {"score": 0.0, "vector": "NONE"}}, {"lastseen": "2017-06-29T20:15:28", "bulletinFamily": "unix", "description": "This update for openvpn-openssl1 fixes the following issues:\n\n - Some parts of the certificate-parsing code did not always clear all\n allocated memory. This would have allowed clients to leak a few bytes of\n memory for each connection attempt, thereby facilitating a (quite\n inefficient) DoS attack on the server. [bsc#1044947, CVE-2017-7521]\n\n - The ASN1 parsing code contained a bug that could have resulted in some\n buffers being free()d twice, and this issue could have potentially been\n triggered remotely by a VPN peer. [bsc#1044947, CVE-2017-7521]\n\n - If clients used a HTTP proxy with NTLM authentication, a\n man-in-the-middle attacker between client and proxy could cause the\n client to crash or disclose at most 96 bytes of stack memory. The\n disclosed stack memory was likely to contain the proxy password. If the\n proxy password had not been reused, this was unlikely to compromise the\n security of the OpenVPN tunnel itself. Clients who did not use the\n --http-proxy option with ntlm2 authentication were not affected.\n [bsc#1044947, CVE-2017-7520]\n\n - It was possible to trigger an assertion by sending a malformed IPv6\n packet. That issue could have been abused to remotely shutdown an\n openvpn server or client, if IPv6 and --mssfix were enabled and if the\n IPv6 networks used inside the VPN were known. [bsc#1044947,\n CVE-2017-7508]\n\n - The installed sample configuration file was updated to comply to FIPS\n requirements. [bsc#988522]\n\n - Remedy large latencies on the openVPN server during authentication\n process. [bsc#959511]\n\n - Fix potential denial-of-service attacks found during independent audits.\n [bsc#1038713, bsc#1038709, CVE-2017-7478, bsc#1038711, CVE-2017-7479]\n\n", "modified": "2017-06-29T18:12:39", "published": "2017-06-29T18:12:39", "href": "http://lists.opensuse.org/opensuse-security-announce/2017-06/msg00042.html", "id": "SUSE-SU-2017:1718-1", "title": "Security update for openvpn-openssl1 (important)", "type": "suse", "cvss": {"score": 5.0, "vector": "AV:NETWORK/AC:LOW/Au:NONE/C:NONE/I:NONE/A:PARTIAL/"}}, {"lastseen": "2017-06-21T20:15:10", "bulletinFamily": "unix", "description": "This update for openvpn fixes the following issues:\n\n - It was possible to trigger an assertion by sending a malformed IPv6\n packet. That issue could have been abused to remotely shutdown an\n openvpn server or client, if IPv6 and --mssfix were enabled and if the\n IPv6 networks used inside the VPN were known. [bsc#1044947,\n CVE-2017-7508]\n\n", "modified": "2017-06-21T18:17:16", "published": "2017-06-21T18:17:16", "href": "http://lists.opensuse.org/opensuse-security-announce/2017-06/msg00028.html", "id": "SUSE-SU-2017:1642-1", "title": "Security update for openvpn (important)", "type": "suse", "cvss": {"score": 0.0, "vector": "NONE"}}], "slackware": [{"lastseen": "2019-05-30T07:37:31", "bulletinFamily": "unix", "description": "New openvpn packages are available for Slackware 13.0, 13.1, 13.37, 14.0, 14.1,\n14.2, and -current to fix security issues.\n\n\nHere are the details from the Slackware 14.2 ChangeLog:\n\npatches/packages/openvpn-2.3.17-i586-1_slack14.2.txz: Upgraded.\n This update fixes several denial of service issues discovered\n by Guido Vranken.\n For more information, see:\n https://community.openvpn.net/openvpn/wiki/VulnerabilitiesFixedInOpenVPN243\n https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-7508\n https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-7520\n https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-7521\n https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-7512\n https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-7522\n (* Security fix *)\n\nWhere to find the new packages:\n\nThanks to the friendly folks at the OSU Open Source Lab\n(http://osuosl.org) for donating FTP and rsync hosting\nto the Slackware project! :-)\n\nAlso see the "Get Slack" section on http://slackware.com for\nadditional mirror sites near you.\n\nUpdated package for Slackware 13.0:\nftp://ftp.slackware.com/pub/slackware/slackware-13.0/patches/packages/openvpn-2.3.17-i486-1_slack13.0.txz\n\nUpdated package for Slackware x86_64 13.0:\nftp://ftp.slackware.com/pub/slackware/slackware64-13.0/patches/packages/openvpn-2.3.17-x86_64-1_slack13.0.txz\n\nUpdated package for Slackware 13.1:\nftp://ftp.slackware.com/pub/slackware/slackware-13.1/patches/packages/openvpn-2.3.17-i486-1_slack13.1.txz\n\nUpdated package for Slackware x86_64 13.1:\nftp://ftp.slackware.com/pub/slackware/slackware64-13.1/patches/packages/openvpn-2.3.17-x86_64-1_slack13.1.txz\n\nUpdated package for Slackware 13.37:\nftp://ftp.slackware.com/pub/slackware/slackware-13.37/patches/packages/openvpn-2.3.17-i486-1_slack13.37.txz\n\nUpdated package for Slackware x86_64 13.37:\nftp://ftp.slackware.com/pub/slackware/slackware64-13.37/patches/packages/openvpn-2.3.17-x86_64-1_slack13.37.txz\n\nUpdated package for Slackware 14.0:\nftp://ftp.slackware.com/pub/slackware/slackware-14.0/patches/packages/openvpn-2.3.17-i486-1_slack14.0.txz\n\nUpdated package for Slackware x86_64 14.0:\nftp://ftp.slackware.com/pub/slackware/slackware64-14.0/patches/packages/openvpn-2.3.17-x86_64-1_slack14.0.txz\n\nUpdated package for Slackware 14.1:\nftp://ftp.slackware.com/pub/slackware/slackware-14.1/patches/packages/openvpn-2.3.17-i486-1_slack14.1.txz\n\nUpdated package for Slackware x86_64 14.1:\nftp://ftp.slackware.com/pub/slackware/slackware64-14.1/patches/packages/openvpn-2.3.17-x86_64-1_slack14.1.txz\n\nUpdated package for Slackware 14.2:\nftp://ftp.slackware.com/pub/slackware/slackware-14.2/patches/packages/openvpn-2.3.17-i586-1_slack14.2.txz\n\nUpdated package for Slackware x86_64 14.2:\nftp://ftp.slackware.com/pub/slackware/slackware64-14.2/patches/packages/openvpn-2.3.17-x86_64-1_slack14.2.txz\n\nUpdated package for Slackware -current:\nftp://ftp.slackware.com/pub/slackware/slackware-current/slackware/n/openvpn-2.4.3-i586-1.txz\n\nUpdated package for Slackware x86_64 -current:\nftp://ftp.slackware.com/pub/slackware/slackware64-current/slackware64/n/openvpn-2.4.3-x86_64-1.txz\n\n\nMD5 signatures:\n\nSlackware 13.0 package:\n326003ba4359c994d9d9451d8c811a7c openvpn-2.3.17-i486-1_slack13.0.txz\n\nSlackware x86_64 13.0 package:\n38d3e975bd173066d417c00817b1926f openvpn-2.3.17-x86_64-1_slack13.0.txz\n\nSlackware 13.1 package:\n9d90bff4b3934035000e0a637dcd5870 openvpn-2.3.17-i486-1_slack13.1.txz\n\nSlackware x86_64 13.1 package:\nbf3e8104d8f53c2a5cabbde3cd1175f3 openvpn-2.3.17-x86_64-1_slack13.1.txz\n\nSlackware 13.37 package:\n4394a24fc1745b619a6d640da18a17df openvpn-2.3.17-i486-1_slack13.37.txz\n\nSlackware x86_64 13.37 package:\n7231d5dc636ccf47fca8fb60d92c6e9c openvpn-2.3.17-x86_64-1_slack13.37.txz\n\nSlackware 14.0 package:\n37a195492c74384fa7a95f9b8c5d528d openvpn-2.3.17-i486-1_slack14.0.txz\n\nSlackware x86_64 14.0 package:\ndc3a2cdf61c2b1d796ed0663f9deeb77 openvpn-2.3.17-x86_64-1_slack14.0.txz\n\nSlackware 14.1 package:\n601bfdb72e6fef2a0d8108ea33f5cf5d openvpn-2.3.17-i486-1_slack14.1.txz\n\nSlackware x86_64 14.1 package:\n6329704b8a952f3de8b64fe3b294d5ab openvpn-2.3.17-x86_64-1_slack14.1.txz\n\nSlackware 14.2 package:\n0d4cb74aab8225c1967f37c9e1bff8f4 openvpn-2.3.17-i586-1_slack14.2.txz\n\nSlackware x86_64 14.2 package:\nf70fdb325b03da7b18bcfadda367e7b9 openvpn-2.3.17-x86_64-1_slack14.2.txz\n\nSlackware -current package:\ne8aec8c39f95837fd4632167e7844a65 n/openvpn-2.4.3-i586-1.txz\n\nSlackware x86_64 -current package:\nb580604ff3b78acd74805c41d4c2bcc8 n/openvpn-2.4.3-x86_64-1.txz\n\n\nInstallation instructions:\n\nUpgrade the package as root:\n > upgradepkg openvpn-2.3.17-i586-1_slack14.2.txz", "modified": "2017-06-21T11:40:28", "published": "2017-06-21T11:40:28", "id": "SSA-2017-172-01", "href": "http://www.slackware.com/security/viewer.php?l=slackware-security&y=2017&m=slackware-security.569890", "title": "openvpn", "type": "slackware", "cvss": {"score": 7.5, "vector": "AV:N/AC:L/Au:N/C:P/I:P/A:P"}}], "hackerone": [{"lastseen": "2019-10-23T18:01:37", "bulletinFamily": "bugbounty", "bounty": 0.0, "description": "CVE-2017-7521 Remote server crashes/double-free/memory leaks in certificate processing\nCVE-2017-7520 Remote (including MITM) client crash, data leak\nCVE-2017-7508 Remote server crash (forced assertion failure)\nCVE-2017-7522 Crash mbed TLS/PolarSSL-based server\n(no cve) Remote/mitm Null-pointer dereference in establish_http_proxy_passthru()\n(no cve) Stack buffer overflow if long \u2013tls-cipher is given\n(no cve) Remote (including MITM) client stack buffer corruption\n\nhttps://community.openvpn.net/openvpn/wiki/VulnerabilitiesFixedInOpenVPN243\nhttps://guidovranken.wordpress.com/2017/06/21/the-openvpn-post-audit-bug-bonanza/", "modified": "2019-10-14T00:24:28", "published": "2017-06-23T10:58:19", "id": "H1:242579", "href": "https://hackerone.com/reports/242579", "type": "hackerone", "title": "The Internet: 4 severe remote + several minor OpenVPN vulnerabilities", "cvss": {"score": 5.0, "vector": "AV:N/AC:L/Au:N/C:N/I:N/A:P"}}], "amazon": [{"lastseen": "2019-05-29T19:20:38", "bulletinFamily": "unix", "description": "**Issue Overview:**\n\nOpenVPN versions before 2.4.3 and before 2.3.17 are vulnerable to remote denial-of-service when receiving malformed IPv6 packet. ([CVE-2017-7508 __](<https://access.redhat.com/security/cve/CVE-2017-7508>))\n\nOpenVPN versions before 2.4.3 and before 2.3.17 are vulnerable to denial-of-service by authenticated remote attacker via sending a certificate with an embedded NULL character. ([CVE-2017-7522 __](<https://access.redhat.com/security/cve/CVE-2017-7522>))\n\nOpenVPN versions before 2.4.3 and before 2.3.17 are vulnerable to remote denial-of-service due to memory exhaustion caused by memory leaks and double-free issue in extract_x509_extension(). ([CVE-2017-7521 __](<https://access.redhat.com/security/cve/CVE-2017-7521>))\n\nOpenVPN versions before 2.4.3 and before 2.3.17 are vulnerable to denial-of-service and/or possibly sensitive memory leak triggered by man-in-the-middle attacker. ([CVE-2017-7520 __](<https://access.redhat.com/security/cve/CVE-2017-7520>))\n\n \n**Affected Packages:** \n\n\nopenvpn\n\n \n**Issue Correction:** \nRun _yum update openvpn_ to update your system. \n\n\n \n\n\n**New Packages:**\n \n \n i686: \n openvpn-devel-2.4.3-1.19.amzn1.i686 \n openvpn-debuginfo-2.4.3-1.19.amzn1.i686 \n openvpn-2.4.3-1.19.amzn1.i686 \n \n src: \n openvpn-2.4.3-1.19.amzn1.src \n \n x86_64: \n openvpn-2.4.3-1.19.amzn1.x86_64 \n openvpn-debuginfo-2.4.3-1.19.amzn1.x86_64 \n openvpn-devel-2.4.3-1.19.amzn1.x86_64 \n \n \n", "modified": "2017-07-06T22:56:00", "published": "2017-07-06T22:56:00", "id": "ALAS-2017-852", "href": "https://alas.aws.amazon.com/ALAS-2017-852.html", "title": "Important: openvpn", "type": "amazon", "cvss": {"score": 5.0, "vector": "AV:N/AC:L/Au:N/C:N/I:N/A:P"}}], "debian": [{"lastseen": "2019-05-30T02:22:44", "bulletinFamily": "unix", "description": "- -------------------------------------------------------------------------\nDebian Security Advisory DSA-3900-1 security@debian.org\nhttps://www.debian.org/security/ Sebastien Delafond\nJune 27, 2017 https://www.debian.org/security/faq\n- -------------------------------------------------------------------------\n\nPackage : openvpn\nCVE ID : CVE-2017-7479 CVE-2017-7508 CVE-2017-7520 CVE-2017-7521\nDebian Bug : 865480\n\nSeveral issues were discovered in openvpn, a virtual private network\napplication.\n\nCVE-2017-7479\n\n It was discovered that openvpn did not properly handle the\n rollover of packet identifiers. This would allow an authenticated\n remote attacker to cause a denial-of-service via application\n crash.\n\nCVE-2017-7508\n\n Guido Vranken discovered that openvpn did not properly handle\n specific malformed IPv6 packets. This would allow a remote\n attacker to cause a denial-of-service via application crash.\n\nCVE-2017-7520\n\n Guido Vranken discovered that openvpn did not properly handle\n clients connecting to an HTTP proxy with NTLMv2\n authentication. This would allow a remote attacker to cause a\n denial-of-service via application crash, or potentially leak\n sensitive information like the user's proxy password.\n\nCVE-2017-7521\n\n Guido Vranken discovered that openvpn did not properly handle\n some x509 extensions. This would allow a remote attacker to cause\n a denial-of-service via application crash.\n\nFor the oldstable distribution (jessie), these problems have been fixed\nin version 2.3.4-5+deb8u2.\n\nFor the stable distribution (stretch), these problems have been fixed in\nversion 2.4.0-6+deb9u1.\n\nFor the testing distribution (buster), these problems have been fixed\nin version 2.4.3-1.\n\nFor the unstable distribution (sid), these problems have been fixed in\nversion 2.4.3-1.\n\nWe recommend that you upgrade your openvpn packages.\n\nFurther information about Debian Security Advisories, how to apply\nthese updates to your system and frequently asked questions can be\nfound at: https://www.debian.org/security/\n\nMailing list: debian-security-announce@lists.debian.org\n", "modified": "2017-06-27T20:09:26", "published": "2017-06-27T20:09:26", "id": "DEBIAN:DSA-3900-1:0112E", "href": "https://lists.debian.org/debian-security-announce/debian-security-announce-2017/msg00161.html", "title": "[SECURITY] [DSA 3900-1] openvpn security update", "type": "debian", "cvss": {"score": 5.0, "vector": "AV:N/AC:L/Au:N/C:N/I:N/A:P"}}, {"lastseen": "2019-05-30T02:22:52", "bulletinFamily": "unix", "description": "Bernhard Schmidt uploaded new packages for openvpn which fixed the\nfollowing security problems:\n \nCVE-2017-7479\n \n It was discovered that openvpn did not properly handle the\n rollover of packet identifiers. This would allow an authenticated\n remote attacker to cause a denial-of-service via application\n crash. \n \nCVE-2017-7508\n \n Guido Vranken discovered that openvpn did not properly handle\n specific malformed IPv6 packets. This would allow a remote\n attacker to cause a denial-of-service via application crash.\n \nCVE-2017-7520\n \n Guido Vranken discovered that openvpn did not properly handle\n clients connecting to an HTTP proxy with NTLMv2\n authentication. This would allow a remote attacker to cause a \n denial-of-service via application crash, or potentially leak\n sensitive information like the user's proxy password.\n \nCVE-2017-7521\n \n Guido Vranken discovered that openvpn did not properly handle\n some x509 extensions. This would allow a remote attacker to cause\n a denial-of-service via application crash.\n \nFor the jessie-backports distribution the problems have been fixed in\nversion 2.4.0-6+deb9u1~bpo8+1.\n", "modified": "2017-07-05T08:00:25", "published": "2017-07-05T08:00:25", "id": "DEBIAN:BSA-116:60A13", "href": "https://lists.debian.org/debian-backports-announce/2017/debian-backports-announce-201707/msg00001.html", "title": "[BSA-116] Security Update for openvpn", "type": "debian", "cvss": {"score": 5.0, "vector": "AV:N/AC:L/Au:N/C:N/I:N/A:P"}}, {"lastseen": "2019-05-30T02:23:11", "bulletinFamily": "unix", "description": "Package : openvpn\nVersion : 2.2.1-8+deb7u5\nCVE ID : CVE-2017-7520\nDebian Bug : #865480\n\nIt was discovered that there were multiple out-of-bounds memory read\nvulnerabilities in openvpn, a popular virtual private network (VPN) daemon.\n\nIf clients used a HTTP proxy with NTLM authentication, a man-in-the-middle\nattacker could cause the client to crash or disclose at most 96 bytes of stack\nmemory, likely to contain the proxy password.\n\nFor Debian 7 "Wheezy", this issue has been fixed in openvpn version\n2.2.1-8+deb7u5.\n\nWe recommend that you upgrade your openvpn packages.\n\n\nRegards,\n\n- -- \n ,''`.\n : :' : Chris Lamb, Debian Project Leader\n `. `'` lamby@debian.org / chris-lamb.co.uk\n `-\n\n", "modified": "2017-06-22T20:54:13", "published": "2017-06-22T20:54:13", "id": "DEBIAN:DLA-999-1:32E2F", "href": "https://lists.debian.org/debian-lts-announce/2017/debian-lts-announce-201706/msg00028.html", "title": "[SECURITY] [DLA 999-1] openvpn security update", "type": "debian", "cvss": {"score": 4.0, "vector": "AV:N/AC:H/Au:N/C:P/I:N/A:P"}}, {"lastseen": "2019-05-30T02:21:43", "bulletinFamily": "unix", "description": "Package : libclamunrar\nVersion : 0.99-0+deb7u2\nCVE ID : CVE-2017-7520\nDebian Bug : #867223\n\nIt was discovered that there was an arbitrary code execution vulnerability in\nlibcamunrar, a library to add unrar support to the Clam anti-virus software.\n\nThis was caused by an integer overflow resulting in a negative value of the\n``DestPos`` variable, which allows the attacker to write out of bounds when\nsetting ``Mem[DestPos]``.\n\nFor Debian 7 "Wheezy", this issue has been fixed in libclamunrar version\n0.99-0+deb7u2.\n\nWe recommend that you upgrade your libclamunrar packages.\n\n\nRegards,\n\n- -- \n ,''`.\n : :' : Chris Lamb\n `. `'` lamby@debian.org / chris-lamb.co.uk\n `-\n\n", "modified": "2017-07-05T21:31:14", "published": "2017-07-05T21:31:14", "id": "DEBIAN:DLA-1014-1:37017", "href": "https://lists.debian.org/debian-lts-announce/2017/debian-lts-announce-201707/msg00006.html", "title": "[SECURITY] [DLA 1014-1] libclamunrar security update", "type": "debian", "cvss": {"score": 4.0, "vector": "AV:N/AC:H/Au:N/C:P/I:N/A:P"}}], "freebsd": [{"lastseen": "2019-05-29T18:32:15", "bulletinFamily": "unix", "description": "\nSamuli Sepp\u00c3\u00a4nen reports:\n\nIn May/June 2017 Guido Vranken threw a fuzzer at OpenVPN 2.4.2. In\n\t the process he found several vulnerabilities and reported them to\n\t the OpenVPN project. [...] The first releases to have these fixes are OpenVPN 2.4.3 and 2.3.17.\nThis is a list of fixed important vulnerabilities:\n\nRemotely-triggerable ASSERT() on malformed IPv6 packet\nPre-authentication remote crash/information disclosure for clients\nPotential double-free in --x509-alt-username\nRemote-triggerable memory leaks\nPost-authentication remote DoS when using the --x509-track option\nNull-pointer dereference in establish_http_proxy_passthru()\n\n\n", "modified": "2017-05-19T00:00:00", "published": "2017-05-19T00:00:00", "id": "9F65D382-56A4-11E7-83E3-080027EF73EC", "href": "https://vuxml.freebsd.org/freebsd/9f65d382-56a4-11e7-83e3-080027ef73ec.html", "title": "OpenVPN -- several vulnerabilities", "type": "freebsd", "cvss": {"score": 7.5, "vector": "AV:N/AC:L/Au:N/C:P/I:P/A:P"}}], "thn": [{"lastseen": "2018-01-27T09:18:08", "bulletinFamily": "info", "description": "[](<https://1.bp.blogspot.com/-wlCB_gy9hP8/WUteRwBYhII/AAAAAAAAtRY/OPsn2e0p7NkzXdQB_bXVBRf29pSkwdv9wCLcBGAs/s1600/openvpn-security-flaw.png>)\n\nA security researcher has found four vulnerabilities, including a critical remote code execution bug, in OpenVPN, those were not even caught in the two big security audits of the open source VPN software this year. \n \nOpenVPN is one of the most popular and widely used open source VPN software solutions mostly used for various connectivity needs, but it is especially popular for anonymous and private access to the Internet. \n \nThis year, two independent security audits of OpenVPN were carried out to look for flaws, backdoors, and other defects in the open source software \u2013 one conducted by a team led by Johns Hopkins University crypto-boffin Dr. Matthew D. Green. \n \nThe audits resulted in a patch of a few vulnerabilities in the widely used open source software, giving OpenVPN a clean chit. \n \n\n\n### Researcher Used Fuzzer to find Bugs in OpenVPN\n\n \nResearcher Guido Vranken of Netherlands exclusively used a fuzzer and recently discovered four security holes in OpenVPN that escaped both the security audits. \n \nThree of the four flaws the researcher discovered are server-side, two of which cause servers to crash, while the remaining is a client-side bug that could allow an attacker to steal a password to gain access to the proxy. \n \nThe most critical vulnerability of all is **CVE-2017-7521**, which affects OpenVPN server-side and resides in extract_x509_extension() function which deals with SSL certificates. \n \nThe vulnerability could allow a remote authenticated attacker to craft and send a certificate that either crashes the OpenVPN service or triggers a double free that potentially lead to remote code execution within the server. \n \nVranken was not able to demonstrate the RCE bug but argued that the remote code execution could be achieved in theory. In a [report](<https://guidovranken.wordpress.com/2017/06/21/the-openvpn-post-audit-bug-bonanza/>) published Wednesday, he had explained how one could achieve a remote memory leak because of the service's failure to check a particular return value. \n\n\n> \"If you look in the OpenSSL source code, one way through which ASN1_STRING_to_UTF8 can fail is if it cannot allocate sufficient memory,\" Vranken said in his report. \"So the fact that an attacker can trigger a double-free IF the server has insufficient memory, combined with the fact that the attacker can arbitrarily drain the server of memory, makes it plausible that a remote double-free can be achieved.\" \n\n> \"But if a double-free is inadequate to achieve remote code execution, there are probably other functions, whose behavior is wildly different under memory duress, that you can exploit.\"\n\nThe second vulnerability, **CVE-2017-7520**, resides in the way OpenVPN connects to a Windows NTLM version 2 proxy. \n \nA man-in-the-middle attacker between the OpenVPN client and the proxy server can either remotely crash the client or steal the user's password to the proxy from a memory leak. \n \nThe vulnerability could be triggered only under certain circumstances, like when the client connects to a proxy through NTLM version 2 authentication, or when the client specifies a username ending with a backslash. \n\n\n> \"If clients use a HTTP proxy with NTLM authentication (--http-proxy [|'auto'|'auto-nct'] ntlm2), a man-in-the-middle [MITM] attacker between the client and the proxy can cause the client to crash or disclose at most 96 bytes of stack memory,\" the OpenVPN team explains. \n\n> \"The disclosed stack memory is likely to contain the proxy password. If the proxy password is not reused, this is unlikely to compromise the security of the OpenVPN tunnel itself. Clients who do not use the --http-proxy option with ntlm2 authentication are not affected.\"\n\nOther two vulnerabilities (**CVE-2017-7508** and **CVE-2017-7522**) are remote server crashes which could trigger by sending maliciously-crafted IPv6 packets or malicious data post-authentication. \n \n\n\n### Patches for Servers and Clients Already Available\n\n \nVranken responsibly disclosed all the vulnerabilities he discovered to the OpenVPN team in May and June and the team has already patched the issues in its latest version of the VPN software. \n \nWhile there is no proof of any of the vulnerabilities had been publicly exploited, users are strongly advised to update their installations to [OpenVPN versions 2.4.3 or 2.3.17](<https://community.openvpn.net/openvpn/wiki/VulnerabilitiesFixedInOpenVPN243>) as soon as possible in order to be on the safer side. \n \nFor more in-depth technical details of all the vulnerabilities, you can head on to the report titled, _\"The OpenVPN Post-Audit Bug Bonanza,\" _[published](<https://guidovranken.wordpress.com/2017/06/21/the-openvpn-post-audit-bug-bonanza/>) by Vranken on Wednesday.\n", "modified": "2017-06-22T08:19:38", "published": "2017-06-21T21:08:00", "id": "THN:C1BE07D6F243E68380FCD3A7F0CDD890", "href": "https://thehackernews.com/2017/06/openvpn-security-flaw_21.html", "type": "thn", "title": "Critical RCE Flaw Found in OpenVPN that Escaped Two Recent Security Audits", "cvss": {"score": 5.0, "vector": "AV:NETWORK/AC:LOW/Au:NONE/C:NONE/I:NONE/A:PARTIAL/"}}], "ubuntu": [{"lastseen": "2019-05-29T19:21:58", "bulletinFamily": "unix", "description": "Karthikeyan Bhargavan and Ga\u00ebtan Leurent discovered that 64-bit block ciphers are vulnerable to a birthday attack. A remote attacker could possibly use this issue to recover cleartext data. Fixing this issue requires a configuration change to switch to a different cipher. This update adds a warning to the log file when a 64-bit block cipher is in use. This issue only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS and Ubuntu 16.10. (CVE-2016-6329)\n\nIt was discovered that OpenVPN incorrectly handled rollover of packet ids. An authenticated remote attacker could use this issue to cause OpenVPN to crash, resulting in a denial of service. This issue only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS and Ubuntu 16.10. (CVE-2017-7479)\n\nGuido Vranken discovered that OpenVPN incorrectly handled certain malformed IPv6 packets. A remote attacker could use this issue to cause OpenVPN to crash, resulting in a denial of service. (CVE-2017-7508)\n\nGuido Vranken discovered that OpenVPN incorrectly handled memory. A remote attacker could use this issue to cause OpenVPN to crash, resulting in a denial of service. (CVE-2017-7512)\n\nGuido Vranken discovered that OpenVPN incorrectly handled an HTTP proxy with NTLM authentication. A remote attacker could use this issue to cause OpenVPN clients to crash, resulting in a denial of service, or possibly expose sensitive memory contents. (CVE-2017-7520)\n\nGuido Vranken discovered that OpenVPN incorrectly handled certain x509 extensions. A remote attacker could use this issue to cause OpenVPN to crash, resulting in a denial of service. (CVE-2017-7521)", "modified": "2017-06-22T00:00:00", "published": "2017-06-22T00:00:00", "id": "USN-3339-1", "href": "https://usn.ubuntu.com/3339-1/", "title": "OpenVPN vulnerabilities", "type": "ubuntu", "cvss": {"score": 7.5, "vector": "AV:N/AC:L/Au:N/C:P/I:P/A:P"}}, {"lastseen": "2019-05-29T19:21:11", "bulletinFamily": "unix", "description": "USN-3339-1 fixed several issues in OpenVPN. This update provides the corresponding update for Ubuntu 12.04 ESM.\n\nOriginal advisory details:\n\nGuido Vranken discovered that OpenVPN incorrectly handled an HTTP proxy with NTLM authentication. A remote attacker could use this issue to cause OpenVPN clients to crash, resulting in a denial of service, or possibly expose sensitive memory contents. (CVE-2017-7520)", "modified": "2017-08-07T00:00:00", "published": "2017-08-07T00:00:00", "id": "USN-3339-2", "href": "https://usn.ubuntu.com/3339-2/", "title": "OpenVPN vulnerability", "type": "ubuntu", "cvss": {"score": 4.0, "vector": "AV:N/AC:H/Au:N/C:P/I:N/A:P"}}], "threatpost": [{"lastseen": "2018-10-06T22:53:30", "bulletinFamily": "info", "description": "OpenVPN has this week patched four vulnerabilities, including a critical remote code execution bug, a little more than a month after the results of [two security audits of the open source VPN software](<https://threatpost.com/openvpn-audits-yield-mixed-bag/125694/>) were published.\n\nThe patches were released after private disclosures in May and June by researcher Guido Vranken of the Netherlands. Vranken said the vulnerabilities were not turned up in either audit, which were a combination of manual source code reviews and automated scanning; Vranken said he exclusively used a fuzzer to find these bugs.\n\nThe most critical vulnerability, CVE-2017-7521, affects OpenVPN server side and could allow an authenticated hacker to run code on a compromised box.\n\n\u201c[CVE-2017-7521](<https://github.com/OpenVPN/openvpn/commit/cb4e35ece4a5b70b10ef9013be3bff263d82f32b>) can drain the server of available memory, which may lead to a \u2018double-free,\u2019 which is a way to corrupt the server\u2019s memory. In short, the worst-case scenario is that the user can execute their code on the server,\u201d Vranken said. \u201cThis is the worst vulnerability. They authenticate and then send crafted data, after which the server crashes. I\u2019d say this a worrisome issue for (commercial) VPN providers, so they definitely need to update as soon as possible.\u201d\n\nVranken was unaware whether any of the vulnerabilities had been publicly exploited.\n\n\u201cThis is difficult for me to say. But I\u2019d say that if I can do this in a couple of weeks of spare time out of sheer curiosity, heavily funded organizations with political objectives can do it too,\u201d he said.\n\nThree of the four vulnerabilities Vranken discovered were server-side with the other two causing [servers](<https://github.com/OpenVPN/openvpn/commit/c3f47077a7756de5929094569421a95aa66f2022>) to [crash](<https://github.com/OpenVPN/openvpn/commit/69162924de3600bfe8ae9708a1d6e3f4515ef995>). The client-side bug allows an attacker to steal a password to gain access to the proxy, Vranken said, adding that the three server flaws require the attacker be authenticated in order to exploit.\n\n\u201cThe crashes and the one that steals the password are not so difficult. A medium level of understanding of the C programming language and computer internals would be sufficient,\u201d Vranken said as to the ease of exploit. \u201cIt is also relatively easy to drain the server of memory. But to exploit that to achieve remote code execution, requires a high level of expertise.\u201d\n\nVranken provide in-depth technical explanations of each bug in a [report](<https://guidovranken.wordpress.com/2017/06/21/the-openvpn-post-audit-bug-bonanza/>) published today. In the critical vulnerability, Vranken explains how he achieved a remote memory leak because of OpenVPN\u2019s failure to check a particular return value. From his report:\n\n\u201cIf you look in the OpenSSL source code, one way through which ASN1_STRING_to_UTF8 can fail is if it cannot allocate sufficient memory. So the fact that an attacker can trigger a double-free IF the server has insufficient memory, combined with the fact that the attacker can arbitrarily drain the server of memory, makes it plausible that a remote double-free can be achieved. But if a double-free is inadequate to achieve remote code execution, there are probably other functions, whose behavior is wildly different under memory duress, that you can exploit.\u201d\n\nThe [client-side](<https://github.com/OpenVPN/openvpn/commit/7718c8984f04b507c1885f363970e2124e3c6c77>) [bug](<https://github.com/OpenVPN/openvpn/commit/2d032c7fcdfd692c851ea2fa858b4c2d9ea7d52d>) also merits attention, Vranken said, adding that it is triggered only under particular certain circumstances, such as when the client connects to a proxy via NTLM version 2 authentication.\n\n\u201cAll the server issues require that the user is authenticated. This requires that the system administrator signs the certificate of a malicious user,\u201d Vranken said. \u201cFor individual users who run their private server this is unlikely to occur, but it is bad for VPN services that have automated this process for a large group of (untrusted) users.\u201d\n\nOne of the OpenVPN audits, carried out from December 2016 to February 2017, found a handful of low and medium issues but no major vulnerabilities. That audit lauded OpenVPN\u2019s overall cryptographic design, calling it solid with a caveat that some implementations could \u201cundermine a user\u2019s ability to deploy a secure VPN solution\u201d however. These bugs were patched in May.\n\nThe other audit was more of a security evaluation of the software running in OpenVPN 2.4.0; it found two bugs that were also patched in May.\n", "modified": "2017-06-21T15:14:36", "published": "2017-06-21T11:14:36", "id": "THREATPOST:738D3E12C5D9374D46CA1BEF0D15A79C", "href": "https://threatpost.com/openvpn-patches-critical-remote-code-execution-vulnerability/126425/", "type": "threatpost", "title": "OpenVPN Patches Critical Remote Code Execution Vulnerability", "cvss": {"score": 4.3, "vector": "AV:NETWORK/AC:MEDIUM/Au:NONE/C:NONE/I:NONE/A:PARTIAL/"}}]}
