CVE-2023-43809
Prior to version 0.6.2, a security vulnerability in Soft Serve could allow an unauthenticated, remote attacker to bypass public key authentication when keyboard-interactive SSH authentication is active, through the `allow-keyless` setting, and the…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.89%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
Soft Serve is a self-hostable Git server for the command line. Prior to version 0.6.2, a security vulnerability in Soft Serve could allow an unauthenticated, remote attacker to bypass public key authentication when keyboard-interactive SSH authentication is active, through the `allow-keyless` setting, and the public key requires additional client-side verification for example using FIDO2 or GPG. This is due to insufficient validation procedures of the public key step during SSH request handshake, granting unauthorized access if the keyboard-interaction mode is utilized. An attacker could exploit this vulnerability by presenting manipulated SSH requests using keyboard-interactive authentication mode. This could potentially result in unauthorized access to the Soft Serve. Users should upgrade to the latest Soft Serve version `v0.6.2` to receive the patch for this issue. To workaround this vulnerability without upgrading, users can temporarily disable Keyboard-Interactive SSH Authentication using the `allow-keyless` setting.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- EPSS
- 0.89% probability · 57th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-287
- Affected
- charm/soft serve
- Source
- security-advisories@github.com
References
- https://github.com/charmbracelet/soft-serve/commit/407c4ec72d1006cee1ff8c1775e5bcc091c2bc89Patch
- https://github.com/charmbracelet/soft-serve/issues/389Exploit, Issue Tracking
- https://github.com/charmbracelet/soft-serve/releases/tag/v0.6.2Release Notes
- https://github.com/charmbracelet/soft-serve/security/advisories/GHSA-mc97-99j4-vm2vVendor Advisory
- https://github.com/charmbracelet/soft-serve/commit/407c4ec72d1006cee1ff8c1775e5bcc091c2bc89Patch
- https://github.com/charmbracelet/soft-serve/issues/389Exploit, Issue Tracking
- https://github.com/charmbracelet/soft-serve/releases/tag/v0.6.2Release Notes
- https://github.com/charmbracelet/soft-serve/security/advisories/GHSA-mc97-99j4-vm2vVendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.