CVE-2017-17831

Severity: high (CVSS 8.8 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 3.7% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2017-12-21 · updated 2026-06-17
Weakness: CWE-20

Description

GitHub Git LFS before 2.1.1 allows remote attackers to execute arbitrary commands via an ssh URL with an initial dash character in the hostname, located on a "url =" line in a .lfsconfig file within a repository.

Affected products

git-lfs: before 2.1.1 — fixed in 2.1.1

How to fix

Upgrade to a fixed version: git-lfs 2.1.1. Check the vendor advisory for mitigations.

References

http://blog.recurity-labs.com/2017-08-10/scm-vulns
http://www.securityfocus.com/bid/102926
https://confluence.atlassian.com/sourcetreekb/sourcetree-security-advisory-2018-01-24-942834324.html
https://github.com/git-lfs/git-lfs/pull/2242
https://github.com/git-lfs/git-lfs/releases/tag/v2.1.1
http://blog.recurity-labs.com/2017-08-10/scm-vulns
http://www.securityfocus.com/bid/102926
https://confluence.atlassian.com/sourcetreekb/sourcetree-security-advisory-2018-01-24-942834324.html
https://github.com/git-lfs/git-lfs/pull/2242
https://github.com/git-lfs/git-lfs/releases/tag/v2.1.1

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