What’s Vulnerable › Vulnerabilities

CVE-2020-13881

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-06-06 · updated 2026-06-17
• Weakness: CWE-532

Description

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.

Affected products

• Arista Networks CloudVision Portal: before 2020.1.2 — fixed in 2020.1.2
• Canonical Ubuntu Linux: 16.04, 18.04, 20.04
• Debian Linux: 8.0, 9.0
• Pam Tacplus Project Pam Tacplus: from 1.3.8 through 1.5.1

How to fix

Upgrade to a fixed version: Arista Networks CloudVision Portal 2020.1.2. Check the vendor advisory for mitigations.

References

• http://www.openwall.com/lists/oss-security/2020/06/08/1
• https://github.com/kravietz/pam_tacplus/commit/4a9852c31c2fd0c0e72fbb689a586aabcfb11cb0
• https://github.com/kravietz/pam_tacplus/issues/149
• https://lists.debian.org/debian-lts-announce/2020/06/msg00007.html
• https://lists.debian.org/debian-lts-announce/2021/08/msg00006.html
• https://usn.ubuntu.com/4521-1/
• https://www.arista.com/en/support/advisories-notices/security-advisories/11705-security-advisory-50
• http://www.openwall.com/lists/oss-security/2020/06/08/1
• https://github.com/kravietz/pam_tacplus/commit/4a9852c31c2fd0c0e72fbb689a586aabcfb11cb0
• https://github.com/kravietz/pam_tacplus/issues/149
• https://lists.debian.org/debian-lts-announce/2020/06/msg00007.html
• https://lists.debian.org/debian-lts-announce/2021/08/msg00006.html

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