Unauthenticated file deletion via traversal bypass
Published Sep 27, 2021 · Updated Aug 3, 2024
Path traversal in SonicWall SMA 100 Series firmware allows remote attackers to delete arbitrary files through an unauthenticated request. The handleWAFRedirect CGI endpoint accepts a parent-directory path in its hdl parameter and removes the referenced file outside the intended directory. Deleting persist.db and rebooting resets the appliance to factory defaults, enabling administrative access with default credentials.
Summary
What happened
Path traversal in SonicWall SMA 100 Series firmware allows remote attackers to delete arbitrary files through an unauthenticated request. The handleWAFRedirect CGI endpoint accepts a parent-directory path in its hdl parameter and removes the referenced file outside the intended directory. Deleting persist.db and rebooting resets the appliance to factory defaults, enabling administrative access with default credentials.
The record
- CVE
- CVE-2021-20034
- Published
- Sep 27, 2021
- Updated
- Aug 3, 2024
- Vendor
- SonicWall
- Product
- Secure Mobile Access (SMA) 100 Series
- Classifications
- CWE-22, CWE-284, T1485
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 27, 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=10.2.0.7-34sv and earlier
- Affected versionversion=10.2.1.0-17sv and earlier
- Affected versionversion=9.0.0.10-28sv and earlier
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.
Weakness, pattern, technique
Public exploit references
- SonicWall SMA 10.2.1.0-17sv Password Resetfunctional · validated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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