Code execution via CTU DLL search order
Published Feb 12, 2021 · Updated Aug 3, 2024
Untrusted search path handling in F5 Networks BIG-IP Edge Client allows local users to execute code through the Windows CTU. When CTU runs, Windows searches its current directory for a required DLL and loads an attacker-supplied library there without restricting the lookup to a trusted path. Exploitation requires an attacker-controlled DLL in that directory and a victim to run CTU, after which the library executes with the victim's rights.
Summary
What happened
Untrusted search path handling in F5 Networks BIG-IP Edge Client allows local users to execute code through the Windows CTU. When CTU runs, Windows searches its current directory for a required DLL and loads an attacker-supplied library there without restricting the lookup to a trusted path. Exploitation requires an attacker-controlled DLL in that directory and a victim to run CTU, after which the library executes with the victim's rights.
The record
- CVE
- CVE-2021-22980
- Published
- Feb 12, 2021
- Updated
- Aug 3, 2024
- Vendor
- F5 Networks
- Product
- BIG-IP Edge Client
- Classifications
- CWE-426, T1574.001
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Feb 12, 2021CVE publishedPublication date reported by the CVE source.
- Aug 3, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=7.2.x before 7.2.1.1, 7.1.9.x before 7.1.9.8, and 7.1.x-7.1.8.x before 7.1.8.5
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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