High
CVE-2020-13162
CVE ID
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CVE-2020-13162
MITRE ATT&CK
Collection
Command and Control
Credential Access
Defense Evasion
Discovery
Execution
Exfiltration
Impact
Initial Access
Lateral Movement
Persistence
Privilege Escalation
Topic Tags
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.
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Ratings
-
Attacker ValueHigh
-
ExploitabilityVery High
Technical Analysis
PulseSecure version prior to 9.1.6 can be manually triggered to download and install an update. When this process is started, PulseSecure downloads the legitimate msi update file from the internet, verifies that the msi file is correct, then launches the Windows tool msiexec.exe to run the msi that was downloaded. By placing an oplock on the msiexec.exe file, an attacker can hold open the time between the file is verified and when it is run so that they can replace the downloaded msi after the verification takes place, but before the execution starts.
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General Information
Vendors
- pulsesecure
Products
- pulse secure desktop client 5.3,
- pulse secure desktop client 9.0,
- pulse secure desktop client 9.1,
- pulse secure installer service 8.3,
- pulse secure installer service 9.1
References
Advisory
Miscellaneous
Additional Info
Technical Analysis
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CVE ID
AttackerKB requires a CVE ID in order to pull vulnerability data and references from the CVE list and the National Vulnerability Database. If available, please supply below: