Unauthenticated code execution via login buffer overflow
Published Dec 25, 2023 · Updated Aug 2, 2024
Buffer overflow in TOTOLINK A7100RU 7.4cu.2313_B20191024 allows remote attackers to execute code via a crafted login request. The main function in cstecgi.cgi uses sprintf to copy an overlong POST body into a fixed-size stack buffer when action=login and flag=1. No authentication or user interaction is required; successful exploitation runs arbitrary commands or shellcode, while malformed attempts can interrupt the router service.
Summary
What happened
Buffer overflow in TOTOLINK A7100RU 7.4cu.2313_B20191024 allows remote attackers to execute code via a crafted login request. The main function in cstecgi.cgi uses sprintf to copy an overlong POST body into a fixed-size stack buffer when action=login and flag=1. No authentication or user interaction is required; successful exploitation runs arbitrary commands or shellcode, while malformed attempts can interrupt the router service.
The record
- CVE
- CVE-2023-7095
- Published
- Dec 25, 2023
- Updated
- Aug 2, 2024
- Vendor
- TOTOLINK
- Product
- A7100RU
- Classifications
- CWE-120, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Dec 25, 2023CVE 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?
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- Affected versionversion=7.4cu.2313_B20191024
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
- A7100RU login-handler reverse-shell proof of conceptfunctional · demonstrated
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Technologies
Your stack
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Your stack
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