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CVE
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CVE-2020-11008Date: (C)2020-04-22   (M)2020-04-06


Affected versions of Git have a vulnerability whereby Git can be tricked into sending private credentials to a host controlled by an attacker. This bug is similar to CVE-2020-5260(GHSA-qm7j-c969-7j4q). The fix for that bug still left the door open for an exploit where _some_ credential is leaked (but the attacker cannot control which one). 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 are considered illegal as of the recently published Git versions can cause Git to send a "blank" pattern to helpers, missing hostname and protocol fields. Many helpers will interpret this as matching _any_ URL, and will return some unspecified stored password, leaking the password to an attacker's server. 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 root of the problem is in Git itself, which should not be feeding blank input to helpers. However, the ability to exploit the vulnerability in practice depends on which helpers are in use. Credential helpers which are known to trigger the vulnerability: - Git's "store" helper - Git's "cache" helper - the "osxkeychain" helper that ships in Git's "contrib" directory Credential helpers which are known to be safe even with vulnerable versions of Git: - Git Credential Manager for Windows Any helper not in this list should be assumed to trigger the vulnerability.

CVSS Score and Metrics +CVSS Score and Metrics -

CVSS V3 Severity:CVSS V2 Severity:
CVSS Score : 7.5CVSS Score : 5.0
Exploit Score: 3.9Exploit Score: 10.0
Impact Score: 3.6Impact Score: 2.9
 
CVSS V3 Metrics:CVSS V2 Metrics:
Attack Vector: NETWORKAccess Vector: NETWORK
Attack Complexity: LOWAccess Complexity: LOW
Privileges Required: NONEAuthentication: NONE
User Interaction: NONEConfidentiality: PARTIAL
Scope: UNCHANGEDIntegrity: NONE
Confidentiality: HIGHAvailability: NONE
Integrity: NONE 
Availability: NONE 
  
Reference:
http://seclists.org/fulldisclosure/2020/May/41
FEDORA-2020-4e093619bb
FEDORA-2020-b2a2c830cf
FEDORA-2020-f6b3b6fb18
GLSA-202004-13
USN-4334-1
https://lists.debian.org/debian-lts-announce/2020/04/msg00015.html
https://github.com/git/git/commit/c44088ecc4b0722636e0a305f9608d3047197282
https://github.com/git/git/security/advisories/GHSA-hjc9-x69f-jqj7
https://github.com/git/git/security/advisories/GHSA-qm7j-c969-7j4q
https://support.apple.com/kb/HT211183
openSUSE-SU-2020:0598

CPE    3
cpe:/o:debian:debian_linux:8.0
cpe:/o:canonical:ubuntu_linux:16.04::~~lts~~~
cpe:/a:git:git
CWE    1
CWE-522
OVAL    13
oval:org.secpod.oval:def:63398
oval:org.secpod.oval:def:705440
oval:org.secpod.oval:def:1502917
oval:org.secpod.oval:def:205572
...

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