CVE-2023-7095
Published: 25 December 2023
Summary
CVE-2023-7095 is a critical-severity Classic Buffer Overflow (CWE-120) vulnerability in Totolink A7100Ru Firmware. Its CVSS base score is 9.8 (Critical).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 7.1% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
Deeper analysis
A buffer overflow vulnerability tracked as CVE-2023-7095 affects the Totolink A7100RU router running firmware 7.4cu.2313_B20191024. The flaw exists in the main function of /cgi-bin/cstecgi.cgi when the component processes an HTTP POST request with the action=login parameter; unsanitized input supplied to the flag argument triggers the overflow, corresponding to CWE-120.
An unauthenticated attacker can send a crafted POST request over the network to exploit the issue remotely. Successful exploitation yields full control over the device, enabling arbitrary code execution or a denial-of-service condition, consistent with the CVSS 9.8 rating that reflects no required privileges or user interaction.
Public proof-of-concept code has been released, and the EPSS score rose from a low baseline to a peak of 0.1424 before receding to its current value of 0.0933, indicating measurable post-disclosure interest in the vulnerability.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2023-59279
Vulnerability details
A vulnerability, which was classified as critical, has been found in Totolink A7100RU 7.4cu.2313_B20191024. Affected by this issue is the function main of the file /cgi-bin/cstecgi.cgi?action=login of the component HTTP POST Request Handler. The manipulation of the argument flag leads…
more
to buffer overflow. The attack may be launched remotely. The exploit has been disclosed to the public and may be used. VDB-248942 is the identifier assigned to this vulnerability.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Buffer overflow in the publicly accessible web login CGI (/cgi-bin/cstecgi.cgi?action=login) enables remote code execution via exploitation of a public-facing application.
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Platform-independent managed code eliminates the need for unchecked native buffer copies that are the root cause of classic buffer overflows.