CVE-2023-45239: facebook tac_plus Improper Filtering of Special Elements

Vulnerability summary

CVE-2023-45239 is a critical (CVSS 9.8) Improper Filtering of Special Elements vulnerability in facebook tac_plus. EPSS estimates a 2.24% chance of exploitation in the next 30 days, higher than 82.5% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 06-10-2023
   PublishedVulnerability first disclosed.
2. 13-02-2025
   Last modifiedVulnerability information updated.

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.

• CWE-790Improper Filtering of Special ElementsThe product receives data from an upstream component, but does not filter or incorrectly filters special elements before sending it to a downstream component.