Authenticated code execution via getBookmarks heap overflow
Published Dec 8, 2021 · Updated Aug 3, 2024
Heap-based buffer overflow in SonicWall SMA100 allows remote authenticated users to execute code as the appliance's nobody user. When getBookmarks lists a user's bookmarks, libSys.so getFileShareBookmarks copies 128-byte chunks into a fixed 1,280-byte buffer with unchecked strcat calls. Eleven 127-character bookmark names and a low-privileged session suffice to overflow the buffer, leading to code execution under the nobody account.
Summary
What happened
Heap-based buffer overflow in SonicWall SMA100 allows remote authenticated users to execute code as the appliance's nobody user. When getBookmarks lists a user's bookmarks, libSys.so getFileShareBookmarks copies 128-byte chunks into a fixed 1,280-byte buffer with unchecked strcat calls. Eleven 127-character bookmark names and a low-privileged session suffice to overflow the buffer, leading to code execution under the nobody account.
The record
- CVE
- CVE-2021-20043
- Published
- Dec 8, 2021
- Updated
- Aug 3, 2024
- Vendor
- SonicWall
- Product
- Secure Mobile Access (SMA) 100 Series
- Classifications
- CWE-122, CWE-787, T1210
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Dec 8, 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=10.2.0.8-37sv and earlier
- Affected versionversion=10.2.1.1-19sv and earlier
- Affected versionversion=10.2.1.2-24sv 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
- NCC Group authenticated getBookmarks overflow demonstrationproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
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