CVE-2023-45239

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.3% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2023-10-06 · updated 2026-06-17
Weakness: CWE-790

Description

A lack of input validation exists in tac_plus prior to commit 4fdf178 which, when pre or post auth commands are enabled, allows an attacker who can control the username, rem-addr, or NAC address sent to tac_plus to inject shell commands and gain remote code execution on the tac_plus server.

Affected products

Meta tac_plus: before 2023-10-05 — fixed in 2023-10-05
Fedoraproject Fedora: 39

How to fix

Upgrade to a fixed version: Meta tac_plus 2023-10-05. Check the vendor advisory for mitigations.

References

https://github.com/facebook/tac_plus/pull/41
https://github.com/facebook/tac_plus/security/advisories/GHSA-p334-5r3g-4vx3
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/X4J7ZYMFZB4G4OU5EDJPQLP6F6RKDGIH/
https://github.com/facebook/tac_plus/pull/41
https://github.com/facebook/tac_plus/security/advisories/GHSA-p334-5r3g-4vx3
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/X4J7ZYMFZB4G4OU5EDJPQLP6F6RKDGIH/

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