CVE-2020-5260 (GCVE-0-2020-5260)

Vulnerability from cvelistv5 – Published: 2020-04-14 22:50 – Updated: 2024-08-04 08:22
VLAI
Title
malicious URLs may cause Git to present stored credentials to the wrong server
Summary
Affected versions of Git have a vulnerability whereby Git can be tricked into sending private credentials to a host controlled by an attacker. Git uses external "credential helper" programs to store and retrieve passwords or other credentials from secure storage provided by the operating system. Specially-crafted URLs that contain an encoded newline can inject unintended values into the credential helper protocol stream, causing the credential helper to retrieve the password for one server (e.g., good.example.com) for an HTTP request being made to another server (e.g., evil.example.com), resulting in credentials for the former being sent to the latter. There are no restrictions on the relationship between the two, meaning that an attacker can craft a URL that will present stored credentials for any host to a host of their choosing. The vulnerability can be triggered by feeding a malicious URL to git clone. However, the affected URLs look rather suspicious; the likely vector would be through systems which automatically clone URLs not visible to the user, such as Git submodules, or package systems built around Git. The problem has been patched in the versions published on April 14th, 2020, going back to v2.17.x. Anyone wishing to backport the change further can do so by applying commit 9a6bbee (the full release includes extra checks for git fsck, but that commit is sufficient to protect clients against the vulnerability). The patched versions are: 2.17.4, 2.18.3, 2.19.4, 2.20.3, 2.21.2, 2.22.3, 2.23.2, 2.24.2, 2.25.3, 2.26.1.
Severity
9.3 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
CWE
  • CWE-20 - Improper Input Validation
Assigner
References
URL Tags
https://github.com/git/git/security/advisories/GH… x_refsource_CONFIRM
https://github.com/git/git/commit/9a6bbee8006c24b… x_refsource_MISC
https://lore.kernel.org/git/xmqqy2qy7xn8.fsf%40gi… x_refsource_MISC
https://www.debian.org/security/2020/dsa-4657 vendor-advisoryx_refsource_DEBIAN
https://lists.debian.org/debian-lts-announce/2020… mailing-listx_refsource_MLIST
http://www.openwall.com/lists/oss-security/2020/04/15/5 mailing-listx_refsource_MLIST
http://packetstormsecurity.com/files/157250/Git-C… x_refsource_MISC
http://www.openwall.com/lists/oss-security/2020/04/15/6 mailing-listx_refsource_MLIST
http://lists.opensuse.org/opensuse-security-annou… vendor-advisoryx_refsource_SUSE
https://support.apple.com/kb/HT211141 x_refsource_CONFIRM
https://lists.fedoraproject.org/archives/list/pac… vendor-advisoryx_refsource_FEDORA
http://www.openwall.com/lists/oss-security/2020/04/20/1 mailing-listx_refsource_MLIST
https://security.gentoo.org/glsa/202004-13 vendor-advisoryx_refsource_GENTOO
https://lists.fedoraproject.org/archives/list/pac… vendor-advisoryx_refsource_FEDORA
https://lists.fedoraproject.org/archives/list/pac… vendor-advisoryx_refsource_FEDORA
https://lists.fedoraproject.org/archives/list/pac… vendor-advisoryx_refsource_FEDORA
https://usn.ubuntu.com/4329-1/ vendor-advisoryx_refsource_UBUNTU
https://lists.fedoraproject.org/archives/list/pac… vendor-advisoryx_refsource_FEDORA
http://lists.opensuse.org/opensuse-security-annou… vendor-advisoryx_refsource_SUSE
Impacted products
Vendor Product Version
git git Affected: < 2.17.4
Affected: >= 2.18.0, < 2.18.3
Affected: >= 2.19.0, 2.19.4
Affected: >= 2.20.0, < 2.20.3
Affected: >= 2.21.0, < 2.21.2
Affected: >= 2.22.0, < 2.22.3
Affected: >= 2.23.0, < 2.23.2
Affected: >= 2.24.0, < 2.24.2
Affected: >= 2.25.0, < 2.25.3
Affected: >= 2.26.0, < 2.26.1
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            {
              "name": "https://lore.kernel.org/git/xmqqy2qy7xn8.fsf@gitster.c.googlers.com/",
              "refsource": "MISC",
              "url": "https://lore.kernel.org/git/xmqqy2qy7xn8.fsf@gitster.c.googlers.com/"
            },
            {
              "name": "DSA-4657",
              "refsource": "DEBIAN",
              "url": "https://www.debian.org/security/2020/dsa-4657"
            },
            {
              "name": "[debian-lts-announce] 20200415 [SECURITY] [DLA 2177-1] git security update",
              "refsource": "MLIST",
              "url": "https://lists.debian.org/debian-lts-announce/2020/04/msg00010.html"
            },
            {
              "name": "[oss-security] 20200415 CVE-2020-5260: Git: malicious URLs may cause Git to present stored credentials to the wrong server",
              "refsource": "MLIST",
              "url": "http://www.openwall.com/lists/oss-security/2020/04/15/5"
            },
            {
              "name": "http://packetstormsecurity.com/files/157250/Git-Credential-Helper-Protocol-Newline-Injection.html",
              "refsource": "MISC",
              "url": "http://packetstormsecurity.com/files/157250/Git-Credential-Helper-Protocol-Newline-Injection.html"
            },
            {
              "name": "[oss-security] 20200415 Re: CVE-2020-5260: Git: malicious URLs may cause Git to present stored credentials to the wrong server",
              "refsource": "MLIST",
              "url": "http://www.openwall.com/lists/oss-security/2020/04/15/6"
            },
            {
              "name": "openSUSE-SU-2020:0524",
              "refsource": "SUSE",
              "url": "http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00027.html"
            },
            {
              "name": "https://support.apple.com/kb/HT211141",
              "refsource": "CONFIRM",
              "url": "https://support.apple.com/kb/HT211141"
            },
            {
              "name": "FEDORA-2020-cdef88bb89",
              "refsource": "FEDORA",
              "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XPCEOIFLLEF24L6GLVJVFZX4CREDEHDF/"
            },
            {
              "name": "[oss-security] 20200420 CVE-2020-11008: Git: Malicious URLs can still cause Git to send a stored credential to the wrong server",
              "refsource": "MLIST",
              "url": "http://www.openwall.com/lists/oss-security/2020/04/20/1"
            },
            {
              "name": "GLSA-202004-13",
              "refsource": "GENTOO",
              "url": "https://security.gentoo.org/glsa/202004-13"
            },
            {
              "name": "FEDORA-2020-c6548b488f",
              "refsource": "FEDORA",
              "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/7TVS5UG6JD3MYIGSBKMIOS6AF7CR5IPI/"
            },
            {
              "name": "FEDORA-2020-f6b3b6fb18",
              "refsource": "FEDORA",
              "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PN3FUOXKX3AXTULYV53ACABER2W2FSOU/"
            },
            {
              "name": "FEDORA-2020-b2a2c830cf",
              "refsource": "FEDORA",
              "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MOCTR2SEHCPSCOVUQJAGFPGKFMI2VE6V/"
            },
            {
              "name": "USN-4329-1",
              "refsource": "UBUNTU",
              "url": "https://usn.ubuntu.com/4329-1/"
            },
            {
              "name": "FEDORA-2020-4e093619bb",
              "refsource": "FEDORA",
              "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/74Q7WVJ6FKLIN62VS2JD2XCNWK5TNKOW/"
            },
            {
              "name": "openSUSE-SU-2020:0598",
              "refsource": "SUSE",
              "url": "http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00003.html"
            }
          ]
        },
        "source": {
          "advisory": "GHSA-qm7j-c969-7j4q",
          "discovery": "UNKNOWN"
        }
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2020-5260",
    "datePublished": "2020-04-14T22:50:12.000Z",
    "dateReserved": "2020-01-02T00:00:00.000Z",
    "dateUpdated": "2024-08-04T08:22:09.095Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2020-5260",
      "date": "2026-05-29",
      "epss": "0.37878",
      "percentile": "0.97283"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2020-5260\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2020-04-14T23:15:12.607\",\"lastModified\":\"2024-11-21T05:33:47.230\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Affected versions of Git have a vulnerability whereby Git can be tricked into sending private credentials to a host controlled by an attacker. Git uses external \\\"credential helper\\\" programs to store and retrieve passwords or other credentials from secure storage provided by the operating system. Specially-crafted URLs that contain an encoded newline can inject unintended values into the credential helper protocol stream, causing the credential helper to retrieve the password for one server (e.g., good.example.com) for an HTTP request being made to another server (e.g., evil.example.com), resulting in credentials for the former being sent to the latter. There are no restrictions on the relationship between the two, meaning that an attacker can craft a URL that will present stored credentials for any host to a host of their choosing. The vulnerability can be triggered by feeding a malicious URL to git clone. However, the affected URLs look rather suspicious; the likely vector would be through systems which automatically clone URLs not visible to the user, such as Git submodules, or package systems built around Git. The problem has been patched in the versions published on April 14th, 2020, going back to v2.17.x. Anyone wishing to backport the change further can do so by applying commit 9a6bbee (the full release includes extra checks for git fsck, but that commit is sufficient to protect clients against the vulnerability). The patched versions are: 2.17.4, 2.18.3, 2.19.4, 2.20.3, 2.21.2, 2.22.3, 2.23.2, 2.24.2, 2.25.3, 2.26.1.\"},{\"lang\":\"es\",\"value\":\"Las versiones afectadas de Git presentan una vulnerabilidad por la cual Git puede ser enga\u00f1ado para enviar credenciales privadas a un host controlado por un atacante. Git usa programas externos de \\\"credential helper\\\" para almacenar y recuperar contrase\u00f1as u otras credenciales del almacenamiento seguro provistas por el sistema operativo. Las URL especialmente dise\u00f1adas que contienen una nueva l\u00ednea codificada pueden inyectar valores no deseados en la secuencia del protocolo credential helper, causando que el asistente de credenciales recupere la contrase\u00f1a de un servidor (por ejemplo, good.example.com) para una petici\u00f3n HTTP que se lleva a cabo en otro servidor ( por ejemplo, evil.example.com), resultando en que las credenciales para el primero se env\u00eden al segundo. No existen restricciones en la relaci\u00f3n entre los dos, lo que significa que un atacante puede crear una URL que presente credenciales almacenadas para cualquier host a un host de su elecci\u00f3n. La vulnerabilidad puede ser activada alimentando una URL maliciosa a git clone. Sin embargo, las URL afectadas lucen bastante sospechosas; el vector probable ser\u00eda por medio de sistemas que clonan autom\u00e1ticamente las URL no visibles para el usuario, como subm\u00f3dulos de Git o sistemas de paquetes creados alrededor de Git. El problema se ha corregido en las versiones publicadas el 14 de abril de 2020, que se remontan a las versiones v2.17.x. Cualquiera que desee respaldar el cambio a\u00fan m\u00e1s puede hacerlo aplicando el commit 9a6bbee (la versi\u00f3n completa incluye comprobaciones adicionales para git fsck, pero ese commit es suficiente para proteger a los clientes contra la vulnerabilidad). Las versiones parcheadas son: 2.17.4, 2.18.3, 2.19.4, 2.20.3, 2.21.2, 2.22.3, 2.23.2, 2.24.2, 2.25.3, 2.26.1.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N\",\"baseScore\":9.3,\"baseSeverity\":\"CRITICAL\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"REQUIRED\",\"scope\":\"CHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":2.8,\"impactScore\":5.8},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N\",\"baseScore\":7.5,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":3.9,\"impactScore\":3.6}],\"cvssMetricV2\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"2.0\",\"vectorString\":\"AV:N/AC:L/Au:N/C:P/I:N/A:N\",\"baseScore\":5.0,\"accessVector\":\"NETWORK\",\"accessComplexity\":\"LOW\",\"authentication\":\"NONE\",\"confidentialityImpact\":\"PARTIAL\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"NONE\"},\"baseSeverity\":\"MEDIUM\",\"exploitabilityScore\":10.0,\"impactScore\":2.9,\"acInsufInfo\":false,\"obtainAllPrivilege\":false,\"obtainUserPrivilege\":false,\"obtainOtherPrivilege\":false,\"userInteractionRequired\":false}]},\"weaknesses\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-20\"}]},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-522\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:git:git:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"2.17.4\",\"matchCriteriaId\":\"6FA998D4-C2C4-44EE-901D-CF5936D7D1F1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:git:git:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"2.22.0\",\"versionEndExcluding\":\"2.22.3\",\"matchCriteriaId\":\"B14A2B17-C2F7-4DB6-8CC1-B77C4FF9ACD0\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:git-scm:git:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"2.18.0\",\"versionEndExcluding\":\"2.18.3\",\"matchCriteriaId\":\"E405970A-87F9-4EE3-A039-50B150ADAD85\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:git-scm:git:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"2.19.0\",\"versionEndExcluding\":\"2.19.4\",\"matchCriteriaId\":\"40D4CABA-6F48-49AD-96A4-E036EAB3177A\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:git-scm:git:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"2.20.0\",\"versionEndExcluding\":\"2.20.3\",\"matchCriteriaId\":\"0655FC8A-0AB5-4148-A97F-8673C2741D81\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:git-scm:git:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"2.21.0\",\"versionEndExcluding\":\"2.21.2\",\"matchCriteriaId\":\"038B2F58-867C-4D3D-9DB8-AE2481285786\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:git-scm:git:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"2.23.0\",\"versionEndExcluding\":\"2.23.2\",\"matchCriteriaId\":\"51FB16E7-BC48-4333-85FF-335318B987CB\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:git-scm:git:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"2.24.0\",\"versionEndExcluding\":\"2.24.2\",\"matchCriteriaId\":\"8AF1F1BC-33E7-4E0E-8BBB-159D91724133\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:git-scm:git:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"2.25.0\",\"versionEndExcluding\":\"2.25.3\",\"matchCriteriaId\":\"DA825115-AFF5-4F6A-AB80-ABF1540744B8\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:git-scm:git:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"2.26.0\",\"versionEndExcluding\":\"2.26.1\",\"matchCriteriaId\":\"D3219B2B-172D-4DAF-B345-6EDC0330CC8F\"}]}]},{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*\",\"matchCriteriaId\":\"F7016A2A-8365-4F1A-89A2-7A19F2BCAE5B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*\",\"matchCriteriaId\":\"23A7C53F-B80F-4E6A-AFA9-58EEA84BE11D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:canonical:ubuntu_linux:19.10:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"A31C8344-3E02-4EB8-8BD8-4C84B7959624\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"C11E6FB0-C8C0-4527-9AA0-CB9B316F8F43\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"DEECE5FC-CACF-4496-A3E7-164736409252\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"07B237A9-69A3-4A9C-9DA0-4E06BD37AE73\"},{\"vulnerable\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  }
}


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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.