In support.c in pam_tacplus 1.3.8 through 1.5.1, the TACACS+ shared secret gets logged via syslog if the DEBUG loglevel and journald are used.
Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-13881
Reference (s):
- https://github.com/kravietz/pam_tacplus/commit/4a9852c31c2fd0c0e72fbb689a586aabcfb11cb0
- https://github.com/kravietz/pam_tacplus/issues/149
- https://www.arista.com/en/support/advisories-notices/security-advisories/11705-security-advisory-50
- MLIST:[debian-lts-announce] 20200608 [SECURITY] [DLA 2239-1] libpam-tacplus security update
- URL: https://lists.debian.org/debian-lts-announce/2020/06/msg00007.html