8

CVE-2021-21300

Exploit

Git is an open-source distributed revision control system. In affected versions of Git a specially crafted repository that contains symbolic links as well as files using a clean/smudge filter such as Git LFS, may cause just-checked out script to be executed while cloning onto a case-insensitive file system such as NTFS, HFS+ or APFS (i.e. the default file systems on Windows and macOS). Note that clean/smudge filters have to be configured for that. Git for Windows configures Git LFS by default, and is therefore vulnerable. The problem has been patched in the versions published on Tuesday, March 9th, 2021. As a workaound, if symbolic link support is disabled in Git (e.g. via `git config --global core.symlinks false`), the described attack won't work. Likewise, if no clean/smudge filters such as Git LFS are configured globally (i.e. _before_ cloning), the attack is foiled. As always, it is best to avoid cloning repositories from untrusted sources. The earliest impacted version is 2.14.2. The fix versions are: 2.30.1, 2.29.3, 2.28.1, 2.27.1, 2.26.3, 2.25.5, 2.24.4, 2.23.4, 2.22.5, 2.21.4, 2.20.5, 2.19.6, 2.18.5, 2.17.62.17.6.

Data is provided by the National Vulnerability Database (NVD)
Git-scm ≫ Git Version <= 2.14.2
Git-scm ≫ Git Version >= 2.17.0 < 2.17.6
Git-scm ≫ Git Version >= 2.18.0 < 2.18.5
Git-scm ≫ Git Version >= 2.19.0 < 2.19.6
Git-scm ≫ Git Version >= 2.20.0 < 2.20.5
Git-scm ≫ Git Version >= 2.21.0 < 2.21.4
Git-scm ≫ Git Version >= 2.22.0 < 2.22.5
Git-scm ≫ Git Version >= 2.23.0 < 2.23.4
Git-scm ≫ Git Version >= 2.24.0 < 2.24.4
Git-scm ≫ Git Version >= 2.25.0 < 2.25.5
Git-scm ≫ Git Version >= 2.26.0 < 2.26.3
Git-scm ≫ Git Version >= 2.29.0 < 2.29.3
Git-scm ≫ Git Version >= 2.30.0 < 2.30.2
Git-scm ≫ Git Version2.27.0
Git-scm ≫ Git Version2.28.0
Fedoraproject ≫ Fedora Version32
Fedoraproject ≫ Fedora Version33
Fedoraproject ≫ Fedora Version34
Apple ≫ XCode Version < 12.5
   Apple ≫ macOS Version >= 11.0
Debian ≫ Debian Linux Version10.0
Zu dieser CVE wurde keine CISA KEV oder CERT.AT-Warnung gefunden.
EPSS Metriken
Type Source Score Percentile
EPSS FIRST.org 74.69% 0.988
CVSS Metriken
Source Base Score Exploit Score Impact Score Vector string
nvd@nist.gov 7.5 1.6 5.9
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
nvd@nist.gov 5.1 4.9 6.4
AV:N/AC:H/Au:N/C:P/I:P/A:P
security-advisories@github.com 8 1.6 5.8
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N
CWE-59 Improper Link Resolution Before File Access ('Link Following')

The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.

http://seclists.org/fulldisclosure/2021/Apr/60
Third Party Advisory
Mailing List
http://www.openwall.com/lists/oss-security/2021/03/09/3
Third Party Advisory
Exploit
Mailing List