Code execution or service crash via unchecked sprintf
Published Jun 14, 2024 · Updated Aug 2, 2024
Stack-based buffer overflow in TOTOLINK A3700R Firmware 9.1.2u.6165_20211012 allows remote attackers to execute code or crash the service. The setIpPortFilterRules function passes attacker-controlled port fields to sprintf, copying them into a fixed-size stack buffer without checking their length. A published proof of concept includes a session cookie, while CISA assesses no privileges; exploitation still requires adjacent access to the router management CGI.
Summary
What happened
Stack-based buffer overflow in TOTOLINK A3700R Firmware 9.1.2u.6165_20211012 allows remote attackers to execute code or crash the service. The setIpPortFilterRules function passes attacker-controlled port fields to sprintf, copying them into a fixed-size stack buffer without checking their length. A published proof of concept includes a session cookie, while CISA assesses no privileges; exploitation still requires adjacent access to the router management CGI.
The record
- CVE
- CVE-2024-37639
- Published
- Jun 14, 2024
- Updated
- Aug 2, 2024
- Vendor
- TOTOLINK
- Product
- TOTOLINK A3700R Firmware
- Classifications
- CWE-121, T1190
- Attack vector
- adjacent
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 14, 2024CVE publishedPublication date reported by the CVE source.
- Aug 2, 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=9.1.2u.6165_20211012
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.
Weakness, pattern, technique
Public exploit references
- setIpPortFilterRules crafted sPort requestproof 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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