Soft Serve is a self-hostable Git server for the command line. From version 0.6.0 to before version 0.11.4, an authenticated SSH user can force the server to make HTTP requests to internal/private IP addresses by running repo import with a crafted --lfs-endpoint URL. The initial batch request is blind (the response from a metadata endpoint won't parse as valid LFS JSON), but an attacker hosting a fake LFS server can chain this into full read access to internal services by returning download URLs that point at internal targets.
This issue has been patched in version 0.11.4.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
Low
Partial data modification
Availability
Low
Partial disruption
CVSS Vector v3.1
Weakness Type (CWE)
References 3
https://github.com/charmbracelet/soft-serve/commit/3ef660098ab37a7950457da8ecc2…
security-advisories@github.com
https://github.com/charmbracelet/soft-serve/releases/tag/v0.11.4
security-advisories@github.com
https://github.com/charmbracelet/soft-serve/security/advisories/GHSA-3fvx-xrxq-…
security-advisories@github.com