Cyber Resilience

CVE-2024-42737

HighPublic PoCRCE

Published: 13 August 2024

Published
13 August 2024
Modified
13 August 2024
KEV Added
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Patch
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CVSS Score v3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.0702 91.7th percentile
Risk Priority 22 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2024-42737 is a high-severity OS Command Injection (CWE-78) vulnerability in Totolink X5000R Firmware. Its CVSS base score is 8.8 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Unix Shell (T1059.004); ranked in the top 8.3% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

Deeper analysis

CVE-2024-42737 is an OS command injection vulnerability (CWE-78) affecting the TOTOLINK X5000R router running firmware version 9.1.0cu.2350_b20230313. The flaw resides in the delBlacklist function within /cgi-bin/cstecgi.cgi and permits injection of operating system commands through crafted input.

Authenticated attackers with network access can exploit the issue by sending a malicious packet to the CGI endpoint. Successful exploitation grants the ability to execute arbitrary commands on the device, resulting in high impact to confidentiality, integrity, and availability as reflected in the CVSS 8.8 score.

The single public reference is a technical report that demonstrates the vulnerability through proof-of-concept details but contains no information on vendor patches, firmware updates, or recommended mitigations. The associated EPSS score has remained flat at 0.0702 with no material increase since disclosure.

EU & UK References

Vulnerability details

In TOTOLINK X5000r v9.1.0cu.2350_b20230313, the file /cgi-bin/cstecgi.cgi contains an OS command injection vulnerability in delBlacklist. Authenticated Attackers can send malicious packet to execute arbitrary commands.

CWE(s)
CWE-78

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1059.004 Unix Shell Execution
Adversaries may abuse Unix shell commands and scripts for execution.
attack.mitre.org →
T1210 Exploitation of Remote Services Lateral Movement
Adversaries may exploit remote services to gain unauthorized access to internal systems once inside of a network.
attack.mitre.org →
Why these techniques?

OS command injection in the web CGI endpoint (/cgi-bin/cstecgi.cgi delBlacklist) enables authenticated remote attackers to execute arbitrary Unix shell commands on the router, facilitating Unix Shell execution (T1059.004) and exploitation of remote services (T1210).

Affected Assets

totolink
x5000r firmware
9.1.0u.6369_b20230113

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.

SC-27 Platform-independent Applications
addresses: CWE-78

Platform-independent apps typically execute inside a managed runtime or sandbox that restricts direct OS command execution, reducing the ability to exploit OS command injection.

SI-10 Information Input Validation
addresses: CWE-78

Validates inputs to block special elements that would alter OS command execution.

References