Dropbear before 2017.75 might allow local users to read certain files as root, if the file has the authorized_keys file format with a command= option. This occurs because ~/.ssh/authorized_keys is read with root privileges and symlinks are followed.
{"cve": [{"lastseen": "2023-12-02T16:19:27", "description": "Dropbear before 2017.75 might allow local users to read certain files as root, if the file has the authorized_keys file format with a command= option. 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"version": "2.0", "accessVector": "LOCAL", "authentication": "NONE"}, "impactScore": 6.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2017-9079"], "modified": "2019-10-04T09:15:00", "cpe": ["cpe:/o:debian:debian_linux:8.0"], "id": "CVE-2017-9079", "href": "https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-9079", "cvss": {"score": 4.7, "vector": "AV:L/AC:M/Au:N/C:C/I:N/A:N"}, "cpe23": ["cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*"]}], "debian": [{"lastseen": "2023-12-02T17:03:33", "description": "Package : dropbear\nVersion : 2012.55-1.3+deb7u2\nCVE ID : CVE-2017-9079\n\nA vulnerability was found in Dropbear, a lightweight SSH2 server\nand client.\n\nCVE-2017-9079\n\n Jann Horn discovered a local information leak in parsing the\n .authorized_keys file.\n\n\nFor Debian 7 "Wheezy", this problem has been fixed in version\n2012.55-1.3+deb7u2.\n\nWe recommend that you upgrade your dropbear packages.\n\nFurther information about Debian LTS security advisories, how to apply\nthese updates to your system and frequently asked questions can be\nfound at: https://wiki.debian.org/LTS", "cvss3": {"exploitabilityScore": 1.0, "cvssV3": {"baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "attackComplexity": "HIGH", "scope": "UNCHANGED", "attackVector": "LOCAL", "availabilityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "baseScore": 4.7, "vectorString": "CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N", "version": "3.0", "userInteraction": "NONE"}, "impactScore": 3.6}, "published": "2017-05-21T20:56:53", "type": "debian", "title": "[SECURITY] [DLA 948-1] dropbear security update", "bulletinFamily": "unix", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 3.4, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "COMPLETE", "availabilityImpact": "NONE", "integrityImpact": "NONE", "baseScore": 4.7, "vectorString": "AV:L/AC:M/Au:N/C:C/I:N/A:N", "version": "2.0", "accessVector": "LOCAL", "authentication": "NONE"}, "impactScore": 6.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2017-9079"], "modified": "2017-05-21T20:56:53", "id": "DEBIAN:DLA-948-1:FFFE5", "href": "https://lists.debian.org/debian-lts-announce/2017/05/msg00019.html", "cvss": {"score": 4.7, "vector": "AV:L/AC:M/Au:N/C:C/I:N/A:N"}}, {"lastseen": "2023-12-02T11:10:09", "description": "- -------------------------------------------------------------------------\nDebian Security Advisory DSA-3859-1 security@debian.org\nhttps://www.debian.org/security/ Moritz Muehlenhoff\nMay 19, 2017 https://www.debian.org/security/faq\n- -------------------------------------------------------------------------\n\nPackage : dropbear\nCVE ID : CVE-2017-9078 CVE-2017-9079\n\nTwo vulnerabilities were found in Dropbear, a lightweight SSH2 server\nand client:\n\nCVE-2017-9078\n\n Mark Shepard discovered a double free in the TCP listener cleanup\n which could result in denial of service by an authenticated user if\n Dropbear is running with the "-a" option.\n\nCVE-2017-9079\n\n Jann Horn discovered a local information leak in parsing the\n .authorized_keys file.\n\nFor the stable distribution (jessie), these problems have been fixed in\nversion 2014.65-1+deb8u2.\n\nFor the unstable distribution (sid), these problems will be fixed soon.\n\nWe recommend that you upgrade your dropbear 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", "cvss3": {"exploitabilityScore": 2.8, "cvssV3": {"baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "attackComplexity": "LOW", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "baseScore": 8.8, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 5.9}, "published": "2017-05-19T20:55:29", "type": "debian", "title": "[SECURITY] [DSA 3859-1] dropbear security update", "bulletinFamily": "unix", "cvss2": {"severity": "HIGH", "exploitabilityScore": 6.8, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "COMPLETE", "availabilityImpact": "COMPLETE", "integrityImpact": "COMPLETE", "baseScore": 8.5, "vectorString": "AV:N/AC:M/Au:S/C:C/I:C/A:C", "version": "2.0", "accessVector": "NETWORK", "authentication": "SINGLE"}, "impactScore": 10.0, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2017-9078", "CVE-2017-9079"], "modified": "2017-05-19T20:55:29", "id": "DEBIAN:DSA-3859-1:B5680", "href": "https://lists.debian.org/debian-security-announce/2017/msg00119.html", "cvss": {"score": 8.5, "vector": "AV:N/AC:M/Au:S/C:C/I:C/A:C"}}], "osv": [{"lastseen": "2022-08-05T05:20:17", "description": "\nA vulnerability was found in Dropbear, a lightweight SSH2 server\nand client.\n\n\n* [CVE-2017-9079](https://security-tracker.debian.org/tracker/CVE-2017-9079)\nJann Horn discovered a local information leak in parsing the\n .authorized\\_keys file.\n\n\nFor Debian 7 Wheezy, this problem has been fixed in version\n2012.55-1.3+deb7u2.\n\n\nWe recommend that you upgrade your dropbear packages.\n\n\nFurther information about Debian LTS security advisories, how to apply\nthese updates to your system and frequently asked questions can be\nfound at: <https://wiki.debian.org/LTS>\n\n\n", "cvss3": {"exploitabilityScore": 1.0, "cvssV3": {"baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "attackComplexity": "HIGH", "scope": "UNCHANGED", "attackVector": "LOCAL", "availabilityImpact": "NONE", "integrityImpact": "NONE", "baseScore": 4.7, "privilegesRequired": "LOW", "vectorString": "CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N", "userInteraction": "NONE", "version": "3.0"}, "impactScore": 3.6}, "published": "2017-05-21T00:00:00", "type": "osv", "title": "dropbear - security update", "bulletinFamily": "software", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 3.4, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "COMPLETE", "availabilityImpact": "NONE", "integrityImpact": "NONE", "baseScore": 4.7, "vectorString": "AV:L/AC:M/Au:N/C:C/I:N/A:N", "version": "2.0", "accessVector": "LOCAL", "authentication": "NONE"}, "acInsufInfo": false, "impactScore": 6.9, "obtainUserPrivilege": false}, "cvelist": ["CVE-2017-9079"], "modified": "2022-08-05T05:19:58", "id": "OSV:DLA-948-1", "href": "https://osv.dev/vulnerability/DLA-948-1", "cvss": {"score": 4.7, "vector": "AV:L/AC:M/Au:N/C:C/I:N/A:N"}}, {"lastseen": "2023-06-28T06:50:27", "description": "\nTwo vulnerabilities were found in Dropbear, a lightweight SSH2 server\nand client:\n\n\n* [CVE-2017-9078](https://security-tracker.debian.org/tracker/CVE-2017-9078)\nMark Shepard discovered a double free in the TCP listener cleanup\n which could result in denial of service by an authenticated user if\n Dropbear is running with the \"-a\" option.\n* [CVE-2017-9079](https://security-tracker.debian.org/tracker/CVE-2017-9079)\nJann Horn discovered a local information leak in parsing the\n .authorized\\_keys file.\n\n\nFor the stable distribution (jessie), these problems have been fixed in\nversion 2014.65-1+deb8u2.\n\n\nFor the unstable distribution (sid), these problems will be fixed soon.\n\n\nWe recommend that you upgrade your dropbear packages.\n\n\n", "cvss3": {"exploitabilityScore": 2.8, "cvssV3": {"baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "attackComplexity": "LOW", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "HIGH", 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This occurs as `~/.ssh/authorized_keys` is read with root privileges and symlinks are followed.\n", "cvss3": {"exploitabilityScore": 1.0, "cvssV3": {"baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "attackComplexity": "HIGH", "scope": "UNCHANGED", "attackVector": "LOCAL", "availabilityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "baseScore": 4.7, "vectorString": "CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N", "version": "3.0", "userInteraction": "NONE"}, "impactScore": 3.6}, "published": "2020-12-06T03:23:08", "type": "veracode", "title": "Information Disclosure", "bulletinFamily": "software", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 3.4, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "COMPLETE", "availabilityImpact": "NONE", "integrityImpact": "NONE", "baseScore": 4.7, "vectorString": "AV:L/AC:M/Au:N/C:C/I:N/A:N", "version": "2.0", "accessVector": "LOCAL", "authentication": "NONE"}, "impactScore": 6.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2017-9079"], "modified": "2022-04-19T18:13:43", "id": "VERACODE:28184", "href": "https://sca.analysiscenter.veracode.com/vulnerability-database/security/1/1/sid-28184/summary", "cvss": {"score": 4.7, "vector": "AV:L/AC:M/Au:N/C:C/I:N/A:N"}}], "fedora": [{"lastseen": "2020-12-21T08:17:54", "description": "Dropbear is a relatively small SSH server and client. It's particularly use ful for \"embedded\"-type Linux (or other Unix) systems, such as wireless routers. ", "cvss3": {"exploitabilityScore": 2.2, "cvssV3": {"baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "attackComplexity": "HIGH", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "integrityImpact": "HIGH", "baseScore": 8.1, "privilegesRequired": "NONE", "vectorString": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "userInteraction": "NONE", "version": "3.0"}, "impactScore": 5.9}, "published": "2017-06-09T20:14:29", "type": "fedora", "title": "[SECURITY] Fedora 26 Update: dropbear-2017.75-1.fc26", "bulletinFamily": "unix", "cvss2": {"severity": "HIGH", "exploitabilityScore": 8.6, "obtainAllPrivilege": true, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "COMPLETE", "availabilityImpact": "COMPLETE", "integrityImpact": "COMPLETE", "baseScore": 9.3, "vectorString": "AV:N/AC:M/Au:N/C:C/I:C/A:C", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "acInsufInfo": false, "impactScore": 10.0, "obtainUserPrivilege": false}, "cvelist": ["CVE-2017-9078", "CVE-2017-9079"], "modified": "2017-06-09T20:14:29", "id": "FEDORA:03E6660C2084", "href": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/thread/6FKQCXKVLYCITKBCOY3XOSHULRR6KLDE/", "cvss": {"score": 9.3, "vector": "AV:N/AC:M/Au:N/C:C/I:C/A:C"}}, {"lastseen": "2020-12-21T08:17:54", "description": "Dropbear is a relatively small SSH server and client. It's particularly use ful for \"embedded\"-type Linux (or other Unix) systems, such as wireless routers. ", "cvss3": {"exploitabilityScore": 2.2, "cvssV3": {"baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "attackComplexity": "HIGH", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "integrityImpact": "HIGH", "baseScore": 8.1, "privilegesRequired": "NONE", "vectorString": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "userInteraction": "NONE", "version": "3.0"}, "impactScore": 5.9}, "published": "2017-06-05T00:04:15", "type": "fedora", "title": "[SECURITY] Fedora 25 Update: dropbear-2017.75-1.fc25", "bulletinFamily": "unix", "cvss2": {"severity": "HIGH", "exploitabilityScore": 8.6, "obtainAllPrivilege": true, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "COMPLETE", "availabilityImpact": "COMPLETE", "integrityImpact": "COMPLETE", "baseScore": 9.3, "vectorString": "AV:N/AC:M/Au:N/C:C/I:C/A:C", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "acInsufInfo": false, "impactScore": 10.0, "obtainUserPrivilege": false}, "cvelist": ["CVE-2017-9078", "CVE-2017-9079"], "modified": "2017-06-05T00:04:15", "id": "FEDORA:EB322601E801", "href": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/thread/2KITQQ4OHD3SNEGJ6RIDX7SBD6RFYCS4/", "cvss": {"score": 9.3, "vector": "AV:N/AC:M/Au:N/C:C/I:C/A:C"}}, {"lastseen": "2020-12-21T08:17:54", "description": "Dropbear is a relatively small SSH server and client. It's particularly use ful for \"embedded\"-type Linux (or other Unix) systems, such as wireless routers. ", "cvss3": {"exploitabilityScore": 2.2, "cvssV3": {"baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "attackComplexity": "HIGH", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "integrityImpact": "HIGH", "baseScore": 8.1, "privilegesRequired": "NONE", "vectorString": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "userInteraction": "NONE", "version": "3.0"}, "impactScore": 5.9}, "published": "2017-06-04T23:55:22", "type": "fedora", "title": "[SECURITY] Fedora 24 Update: dropbear-2017.75-1.fc24", "bulletinFamily": "unix", "cvss2": {"severity": "HIGH", "exploitabilityScore": 8.6, "obtainAllPrivilege": true, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "COMPLETE", "availabilityImpact": "COMPLETE", "integrityImpact": "COMPLETE", "baseScore": 9.3, "vectorString": "AV:N/AC:M/Au:N/C:C/I:C/A:C", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "acInsufInfo": false, "impactScore": 10.0, "obtainUserPrivilege": false}, "cvelist": ["CVE-2017-9078", "CVE-2017-9079"], "modified": "2017-06-04T23:55:22", "id": "FEDORA:CC62B602F59F", "href": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/thread/MW6RCJ6ML47VLJXTZCSHAKO55LSF7GZP/", "cvss": {"score": 9.3, "vector": "AV:N/AC:M/Au:N/C:C/I:C/A:C"}}], "freebsd": [{"lastseen": "2023-12-02T16:48:24", "description": "\n\nMatt Johnston reports:\n\nFix double-free in server TCP listener cleanup A double-free in\n\t the server could be triggered by an authenticated user if dropbear\n\t is running with -a (Allow connections to forwarded ports from any\n\t host) This could potentially allow arbitrary code execution as root\n\t by an authenticated user.\nFix information disclosure with ~/.ssh/authorized_keys symlink.\n\t Dropbear parsed authorized_keys as root, even if it were a symlink.\n\t The fix is to switch to user permissions when opening authorized_keys.\n\t \n\n\n", "cvss3": {"exploitabilityScore": 2.8, "cvssV3": {"baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "attackComplexity": "LOW", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "baseScore": 8.8, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 5.9}, "published": "2017-05-18T00:00:00", "type": "freebsd", "title": "Dropbear -- two vulnerabilities", "bulletinFamily": "unix", "cvss2": {"severity": "HIGH", "exploitabilityScore": 6.8, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "COMPLETE", "availabilityImpact": "COMPLETE", "integrityImpact": "COMPLETE", "baseScore": 8.5, "vectorString": "AV:N/AC:M/Au:S/C:C/I:C/A:C", "version": "2.0", "accessVector": "NETWORK", "authentication": "SINGLE"}, "impactScore": 10.0, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2017-9078", "CVE-2017-9079"], "modified": "2017-05-18T00:00:00", "id": "60931F98-55A7-11E7-8514-589CFC0654E1", "href": "https://vuxml.freebsd.org/freebsd/60931f98-55a7-11e7-8514-589cfc0654e1.html", "cvss": {"score": 8.5, "vector": "AV:N/AC:M/Au:S/C:C/I:C/A:C"}}], "mageia": [{"lastseen": "2023-12-02T20:47:30", "description": "A double-free in the server could be triggered by an authenticated user if dropbear is running with -a (CVE-2017-9078). The default Mageia configuration does not set -a, so is not vulnerable Dropbear parsed authorized_keys as root, even if it were a symlink. The fix is to switch to user permissions when opening authorized_keys (CVE-2017-9079) \n", "cvss3": {"exploitabilityScore": 2.8, "cvssV3": {"baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "attackComplexity": "LOW", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "baseScore": 8.8, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 5.9}, "published": "2017-06-10T10:01:18", "type": "mageia", "title": "Updated dropbear packages fix security vulnerability\n", "bulletinFamily": "unix", "cvss2": {"severity": "HIGH", "exploitabilityScore": 6.8, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "COMPLETE", "availabilityImpact": "COMPLETE", "integrityImpact": "COMPLETE", "baseScore": 8.5, "vectorString": "AV:N/AC:M/Au:S/C:C/I:C/A:C", "version": "2.0", "accessVector": "NETWORK", "authentication": "SINGLE"}, "impactScore": 10.0, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2017-9078", "CVE-2017-9079"], "modified": "2017-06-10T10:01:18", "id": "MGASA-2017-0165", "href": "https://advisories.mageia.org/MGASA-2017-0165.html", "cvss": {"score": 8.5, "vector": "AV:N/AC:M/Au:S/C:C/I:C/A:C"}}]}
CVE-2017-9079
