Time-of-check Time-of-use (TOCTOU) Race Condition in TeamViewer Windows Installer Rollback Mechanism Leads to Local Privilege Escalation
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 15.82, 15.64.8 (Legacy Windows 7 & 8), 14.7.48855, 13.2.36230
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: none
- Automatable: no
- Technical impact: total
Summary
TeamViewer Full Client and Host prior to version 15.82 on Windows contain a TOCTOU race condition in the installer rollback mechanism. A local low-privileged attacker can replace rollback backup files stored in a user-writable temporary directory before they are restored by an elevated installer, resulting in privilege escalation to NT AUHORITY/SYSTEM. Exploitation requires successful timing of the race condition and a rollback during installation or update.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: total
- Record last updated
Affected versions
- TeamViewer Full Client
From 15.0 · fixed in 15.82; From 15.64.0 (Legacy Windows 7 & 8) · fixed in 15.64.8 (Legacy Windows 7 & 8); From 14.7.0 · fixed in 14.7.48855; From 13.2.0 · fixed in 13.2.36230
- TeamViewer Host
From 15.0 · fixed in 15.82; From 15.64.0 (Legacy Windows 7 & 8) · fixed in 15.64.8 (Legacy Windows 7 & 8); From 14.7.0 · fixed in 14.7.48855; From 13.2.0 · fixed in 13.2.36230