CVE-2021-213008.0HighCWE-59

CVE-2021-21300: malicious repositories can execute remote code while cloning

git

Vendor fix available · Affected: git · Exploitation: likely to be exploited (10% or more)

Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.

88.5%probability of exploitation in the next 30 days

99th percentile

050100

Higher than 99% of scored CVEs

8.0HighCVSS 3.1

LowMediumHighCrit.

DescriptionCVE.org

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.

Affected products1

From the CVE record. A product or version that is not listed is unknown, not unaffected.

git · git>= 2.14.2, < 2.17.62.17.6; >= 2.18.0, < 2.18.5; >= 2.19.0, < 2.19.6; >= 2.20.0, < 2.20.5; >= 2.21.0, < 2.21.4; >= 2.22.0, < 2.22.5 and 8 more

On the Atlas

Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.

Open the Atlas

Exploitation: Likely to be exploited (10% or more). EPSS gives it a 10% or higher chance of exploitation in the next 30 days.
CISA KEV: Not listed
Public check: No public nuclei template
Weakness: Link Following · File and Path Handling
Vendor: git
Published: March 2021
Band: Likely to be exploited (10% or more), March 2021

CoverageNo articles yet

No CyberSIXT article names CVE-2021-21300 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.

References

2 more references are in the CVE record.