Unauthenticated code execution via unchecked sprintf
Published Aug 7, 2023 · Updated Oct 11, 2024
Stack-based buffer overflow in Tenda F1202 and FH1202 1.2.0.9 allows remote attackers to execute code via a crafted mit_ssid value. The formWrlsafeset handler passes the request value to sprintf without a length check, overflowing its acStack_194 stack buffer. No authentication or user interaction is required, and exploitation can instead crash the router's httpd service.
Summary
What happened
Stack-based buffer overflow in Tenda F1202 and FH1202 1.2.0.9 allows remote attackers to execute code via a crafted mit_ssid value. The formWrlsafeset handler passes the request value to sprintf without a length check, overflowing its acStack_194 stack buffer. No authentication or user interaction is required, and exploitation can instead crash the router's httpd service.
The record
- CVE
- CVE-2023-38939
- Published
- Aug 7, 2023
- Updated
- Oct 11, 2024
- Vendor
- Shenzhen Tenda Technology Co., Ltd.
- Product
- F1202
- Classifications
- CWE-787, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 7, 2023CVE publishedPublication date reported by the CVE source.
- Oct 11, 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=V1.2.0.9
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
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
- FirmRec formWrlsafeset proof of conceptproof of concept · demonstrated
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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