Description

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.

Metrics

 

CVSS Version 4.0 CVSS Version 3.x CVSS Version 2.0

NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.

CVSS 4.0 Severity and Vector Strings:

NIST: NVD

N/A

NVD assessment not yet provided.

CVSS 3.x Severity and Vector Strings:

NIST: NVD

Base Score:  7.5 HIGH

Vector:  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CNA:  GitHub, Inc.

Base Score:  9.3 CRITICAL

Vector:  CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N

CVSS 2.0 Severity and Vector Strings:

NIST: NVD

Base Score:  5.0 MEDIUM

Vector:  (AV:N/AC:L/Au:N/C:P/I:N/A:N)

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00027.html	CVE, GitHub, Inc.	Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00003.html	CVE, GitHub, Inc.	Third Party Advisory
http://packetstormsecurity.com/files/157250/Git-Credential-Helper-Protocol-Newline-Injection.html	CVE, GitHub, Inc.	Third Party Advisory  VDB Entry
http://www.openwall.com/lists/oss-security/2020/04/15/5	CVE, GitHub, Inc.	Mailing List
http://www.openwall.com/lists/oss-security/2020/04/15/6	CVE, GitHub, Inc.	Mailing List  Third Party Advisory
http://www.openwall.com/lists/oss-security/2020/04/20/1	CVE, GitHub, Inc.	Mailing List  Third Party Advisory
https://github.com/git/git/commit/9a6bbee8006c24b46a85d29e7b38cfa79e9ab21b	CVE, GitHub, Inc.	Patch  Third Party Advisory
https://github.com/git/git/security/advisories/GHSA-qm7j-c969-7j4q	CVE, GitHub, Inc.	Mitigation  Patch  Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/04/msg00010.html	CVE, GitHub, Inc.	Mailing List  Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/74Q7WVJ6FKLIN62VS2JD2XCNWK5TNKOW/	CVE, GitHub, Inc.
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7TVS5UG6JD3MYIGSBKMIOS6AF7CR5IPI/	CVE, GitHub, Inc.
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MOCTR2SEHCPSCOVUQJAGFPGKFMI2VE6V/	CVE, GitHub, Inc.
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PN3FUOXKX3AXTULYV53ACABER2W2FSOU/	CVE, GitHub, Inc.
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XPCEOIFLLEF24L6GLVJVFZX4CREDEHDF/	CVE, GitHub, Inc.
https://lore.kernel.org/git/xmqqy2qy7xn8.fsf%40gitster.c.googlers.com/	CVE, GitHub, Inc.
https://security.gentoo.org/glsa/202004-13	CVE, GitHub, Inc.	Third Party Advisory
https://support.apple.com/kb/HT211141	CVE, GitHub, Inc.	Third Party Advisory
https://usn.ubuntu.com/4329-1/	CVE, GitHub, Inc.	Third Party Advisory
https://www.debian.org/security/2020/dsa-4657	CVE, GitHub, Inc.	Third Party Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-522	Insufficiently Protected Credentials	NIST
CWE-20	Improper Input Validation	GitHub, Inc.

Known Affected Software Configurations Switch to CPE 2.2

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Change History

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