Description
A time-of-check time-of-use vulnerability in PulseSecureService.exe in Pulse Secure Client versions prior to 9.1.6 down to 5.3 R70 for Windows (which runs as NT AUTHORITY/SYSTEM) allows unprivileged users to run a Microsoft Installer executable with elevated privileges.
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
GitHub 1 repository
-
redtimmy/tu-TOCTOU-kaiu-TOCMEU-CVE-2020-13162- ★ 10 · Sep 2, 2020
Exploit for CVE-2020-13162
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
References
- https://kb.pulsesecure.net/?atype=sa
- https://twitter.com/sepcali/status/1262551597990711296
- 20200616 Pulse Secure Client < 9.1R6 TOCTOU Privilege Escalation (CVE-2020-13162) mailing-list
- https://www.redtimmy.com/privilege-escalation/pulse-secure-client-for-windows-9-1-6-toctou-privilege-escalation-cve-2020-13162/
- http://packetstormsecurity.com/files/158117/Pulse-Secure-Client-For-Windows-Local-Privilege-Escalation.html
- https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44503
- https://twitter.com/gsepcali/status/1262551597990711296
- https://twitter.com/gsepcali/status/1272927080909623297
- 20200904 Pulse Secure Windows Client <9.1.6 (CVE-2020-13162) - exploit mailing-list
- http://packetstormsecurity.com/files/159065/Pulse-Secure-Windows-Client-Privilege-Escalation.html