CVE-2022-28321

Published: 19 September 2022

The Linux-PAM package before 1.5.2-6.1 for openSUSE Tumbleweed allows authentication bypass for SSH logins. The pam_access.so module doesn't correctly restrict login if a user tries to connect from an IP address that is not resolvable via DNS. In such conditions, a user with denied access to a machine can still get access. NOTE: the relevance of this issue is largely limited to openSUSE Tumbleweed and openSUSE Factory; it does not affect Linux-PAM upstream.

Notes

it was stated that upstream is not affected, so, Ubuntu
might not be affected as well, it worth checking

This CVE was assigned to a flaw in SUSE-specific code that was
part of the upstream PR226, and did not make its way into the
the upstream Linux-PAM code. The issue was fixed in PR447, which
was included in upstream Linux-PAM 1.5.3.
USN-5825-1 and USN-5825-2 added the whole PR447 which fixed a
bug, even though the original package didn't contain the
vulnerability described in this CVE.
Marking lunar, mantic, and noble as not-affected since they do
not contain the vulnerable code.

Status

Severity score breakdown

References

• https://www.suse.com/security/cve/CVE-2022-28321.html
• http://download.opensuse.org/source/distribution/openSUSE-current/repo/oss/src/
• https://github.com/linux-pam/linux-pam/pull/447
• https://ubuntu.com/security/notices/USN-5825-1
• https://ubuntu.com/security/notices/USN-5825-2
• https://www.cve.org/CVERecord?id=CVE-2022-28321
• NVD
• Launchpad
• Debian

Bugs

• https://bugzilla.suse.com/show_bug.cgi?id=1197654