The X.509 GeneralName type is a generic type for representing different types of names. One of those name types is known as EDIPartyName. OpenSSL provides a function GENERAL_NAME_cmp which compares different instances of a GENERAL_NAME to see if they are equal or not. This function behaves incorrectly when both GENERAL_NAMEs contain an EDIPARTYNAME. A NULL pointer dereference and a crash may occur leading to a possible denial of service attack. OpenSSL itself uses the GENERAL_NAME_cmp function for two purposes: 1) Comparing CRL distribution point names between an available CRL and a CRL distribution point embedded in an X509 certificate 2) When verifying that a timestamp response token signer matches the timestamp authority name (exposed via the API functions TS_RESP_verify_response and TS_RESP_verify_token) If an attacker can control both items being compared then that attacker could trigger a crash. For example if the attacker can trick a client or server into checking a malicious certificate against a malicious CRL then this may occur. Note that some applications automatically download CRLs based on a URL embedded in a certificate. This checking happens prior to the signatures on the certificate and CRL being verified. OpenSSL's s_server, s_client and verify tools have support for the "-crl_download" option which implements automatic CRL downloading and this attack has been demonstrated to work against those tools. Note that an unrelated bug means that affected versions of OpenSSL cannot parse or construct correct encodings of EDIPARTYNAME. However it is possible to construct a malformed EDIPARTYNAME that OpenSSL's parser will accept and hence trigger this attack. All OpenSSL 1.1.1 and 1.0.2 versions are affected by this issue. Other OpenSSL releases are out of support and have not been checked. Fixed in OpenSSL 1.1.1i (Affected 1.1.1-1.1.1h). Fixed in OpenSSL 1.0.2x (Affected 1.0.2-1.0.2w).
{"id": "ALPINE:CVE-2020-1971", "vendorId": null, "type": "alpinelinux", "bulletinFamily": "unix", "title": "CVE-2020-1971", "description": "The X.509 GeneralName type is a generic type for representing different types of names. One of those name types is known as EDIPartyName. OpenSSL provides a function GENERAL_NAME_cmp which compares different instances of a GENERAL_NAME to see if they are equal or not. This function behaves incorrectly when both GENERAL_NAMEs contain an EDIPARTYNAME. A NULL pointer dereference and a crash may occur leading to a possible denial of service attack. OpenSSL itself uses the GENERAL_NAME_cmp function for two purposes: 1) Comparing CRL distribution point names between an available CRL and a CRL distribution point embedded in an X509 certificate 2) When verifying that a timestamp response token signer matches the timestamp authority name (exposed via the API functions TS_RESP_verify_response and TS_RESP_verify_token) If an attacker can control both items being compared then that attacker could trigger a crash. For example if the attacker can trick a client or server into checking a malicious certificate against a malicious CRL then this may occur. Note that some applications automatically download CRLs based on a URL embedded in a certificate. This checking happens prior to the signatures on the certificate and CRL being verified. OpenSSL's s_server, s_client and verify tools have support for the \"-crl_download\" option which implements automatic CRL downloading and this attack has been demonstrated to work against those tools. Note that an unrelated bug means that affected versions of OpenSSL cannot parse or construct correct encodings of EDIPARTYNAME. However it is possible to construct a malformed EDIPARTYNAME that OpenSSL's parser will accept and hence trigger this attack. All OpenSSL 1.1.1 and 1.0.2 versions are affected by this issue. Other OpenSSL releases are out of support and have not been checked. Fixed in OpenSSL 1.1.1i (Affected 1.1.1-1.1.1h). Fixed in OpenSSL 1.0.2x (Affected 1.0.2-1.0.2w).", "published": "2020-12-08T16:15:00", "modified": "2022-08-29T20:27:00", "epss": [{"cve": "CVE-2020-1971", "epss": 0.00318, "percentile": 0.66102, "modified": "2023-06-06"}], "cvss": {"score": 4.3, "vector": "AV:N/AC:M/Au:N/C:N/I:N/A:P"}, "cvss2": {"cvssV2": {"version": "2.0", "vectorString": "AV:N/AC:M/Au:N/C:N/I:N/A:P", "accessVector": "NETWORK", "accessComplexity": "MEDIUM", "authentication": "NONE", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 4.3}, "severity": "MEDIUM", "exploitabilityScore": 8.6, "impactScore": 2.9, "acInsufInfo": false, "obtainAllPrivilege": false, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}, "cvss3": {"cvssV3": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH", "baseScore": 5.9, "baseSeverity": "MEDIUM"}, "exploitabilityScore": 2.2, "impactScore": 3.6}, "href": "https://security.alpinelinux.org/vuln/CVE-2020-1971", "reporter": "Alpine Linux Development Team", "references": [], "cvelist": ["CVE-2020-1971"], "immutableFields": [], "lastseen": "2023-06-23T11:05:50", "viewCount": 584, "enchantments": {"score": {"value": 6.8, "vector": "NONE"}, "dependencies": {"references": [{"type": "aix", "idList": ["OPENSSL_ADVISORY32.ASC"]}, {"type": "almalinux", "idList": ["ALSA-2020:5476"]}, {"type": "altlinux", "idList": ["1E1894CCC7195BF40E6FE3F3E3556D61", "7386C69A4A551C491C79DF433DF0C82F", "C259351860BCFBD26787D316DF3231D2", "EF98134BF35516822BE2F1B57E3DC142", "F60761B898DC69A381B52FE1247B1814", "FFCD9E207A1C842797CF9F17E8B46010"]}, {"type": "amazon", "idList": ["ALAS-2020-1456", "ALAS2-2020-1573"]}, {"type": "archlinux", "idList": 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Corrected: 2020-12-08 18:28:49 UTC (stable/12, 12.2-STABLE) 2020-12-08 19:10:40 UTC (releng/12.2, 12.2-RELEASE-p2) 2020-12-08 19:10:40 UTC (releng/12.1, 12.1-RELEASE-p12) 2020-12-10 23:43:29 UTC (stable/11, 11.4-STABLE) 2020-12-14 21:20:55 UTC (releng/11.4, 11.4-RELEASE-p6) CVE Name: CVE-2020-1971 Note: The OpenSSL project has published publicly available patches for versions included in FreeBSD 12.x. FreeBSD 11.x includes an older OpenSSL version, and patches for that version from from the OpenSSL project are only available to premium support contract holders. This advisory includes an independently-developed backport of the patch for FreeBSD 11.4. For general information regarding FreeBSD Security Advisories, including descriptions of the fields above, security branches, and the following sections, please visit . 0\\. Revision History v1.0 2020-12-08 Initial release. v1.1 2020-12-14 Added FreeBSD 11.4 patch. I. Background FreeBSD includes software from the OpenSSL Project. The OpenSSL Project is a collaborative effort to develop a robust, commercial-grade, full-featured Open Source toolkit for the Transport Layer Security (TLS) protocol. It is also a general-purpose cryptography library. II. Problem Description The X.509 GeneralName type is a generic type for representing different types of names. One of those name types is known as EDIPartyName. OpenSSL provides a function GENERAL_NAME_cmp which compares different instances of a GENERAL_NAME to see if they are equal or not. This function behaves incorrectly when both GENERAL_NAMEs contain an EDIPARTYNAME. III. Impact An attacker who is able to control both items being compared can trigger a NULL pointer dereference and a crash may occur leading to a possible denial of service attack. As an example, if an attacker can trick a client of server to check a maliciously constructed certificate against a malicious CRL could trigger the NULL dereference. IV. Workaround No workaround is available. V. Solution Upgrade your vulnerable system to a supported FreeBSD stable or release / security branch (releng) dated after the correction date. Perform one of the following: 1) To update your vulnerable system via a binary patch: Systems running a RELEASE version of FreeBSD on the i386 or amd64 platforms can be updated via the freebsd-update(8) utility: # freebsd-update fetch # freebsd-update install 2) To update your vulnerable system via a source code patch: The following patches have been verified to apply to the applicable FreeBSD release branches. a) Download the relevant patch from the location below, and verify the detached PGP signature using your PGP utility. [FreeBSD 12.2, FreeBSD 12.1] # fetch https://security.FreeBSD.org/patches/SA-20:33/openssl.patch # fetch https://security.FreeBSD.org/patches/SA-20:33/openssl.patch.asc # gpg --verify openssl.patch.asc [FreeBSD 11.4] # fetch https://security.FreeBSD.org/patches/SA-20:33/openssl.11.patch # fetch https://security.FreeBSD.org/patches/SA-20:33/openssl.11.patch.asc # gpg --verify openssl.11.patch.asc b) Apply the patch. Execute the following commands as root: # cd /usr/src # patch < /path/to/patch c) Recompile the operating system using buildworld and installworld as described in . Restart all daemons that use the library, or reboot the system. VI. Correction details The following list contains the correction revision numbers for each affected branch. Branch/path Revision \\- ------------------------------------------------------------------------- stable/12/ r368459 releng/12.2/ r368463 releng/12.1/ r368463 stable/11/ r368530 releng/11.4/ r368643 \\- ------------------------------------------------------------------------- To see which files were modified by a particular revision, run the following command, replacing NNNNNN with the revision number, on a machine with Subversion installed: # svn diff -cNNNNNN --summarize svn://svn.freebsd.org/base Or visit the following URL, replacing NNNNNN with the revision number: VII. 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OpenSSL itself uses the GENERAL_NAME_cmp function for two purposes: 1) Comparing CRL distribution point names between an available CRL and a CRL distribution point embedded in an X509 certificate 2) When verifying that a timestamp response token signer matches the timestamp authority name (exposed via the API functions TS_RESP_verify_response and TS_RESP_verify_token) If an attacker can control both items being compared then that attacker could trigger a crash. For example if the attacker can trick a client or server into checking a malicious certificate against a malicious CRL then this may occur. Note that some applications automatically download CRLs based on a URL embedded in a certificate. This checking happens prior to the signatures on the certificate and CRL being verified.\n OpenSSL's s_server, s_client and verify tools have support for the -crl_download option which implements automatic CRL downloading and this attack has been demonstrated to work against those tools. 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