Cyber Resilience

CVE-2024-42743

HighPublic PoCRCE

Published: 12 August 2024

Published
12 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 0.0540 90.3th percentile
Risk Priority 21 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2024-42743 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 Exploit Public-Facing Application (T1190); ranked in the top 9.7% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

Deeper analysis

In TOTOLINK X5000r firmware version 9.1.0cu.2350_b20230313, the /cgi-bin/cstecgi.cgi endpoint contains an OS command injection vulnerability (CWE-78) in the setSyslogCfg function. The flaw allows improper handling of user-supplied input that is passed to the underlying operating system, affecting this specific router model and firmware build.

Authenticated attackers with network access can exploit the issue by sending crafted packets to the CGI endpoint. Successful exploitation grants the ability to execute arbitrary operating system commands, resulting in full compromise of confidentiality, integrity, and availability as reflected in the CVSS 8.8 score.

The sole reference is a technical report detailing the vulnerability but provides no information on vendor patches, firmware updates, or other mitigations. The associated EPSS score has remained flat at 0.0540 with no observed rise after 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 setSyslogCfg . Authenticated Attackers can send malicious packet to execute arbitrary commands.

CWE(s)
CWE-78

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
T1059.008 Network Device CLI Execution
Adversaries may abuse scripting or built-in command line interpreters (CLI) on network devices to execute malicious command and payloads.
attack.mitre.org →
Why these techniques?

The OS command injection vulnerability in the authenticated web CGI (/cgi-bin/cstecgi.cgi#setSysLogCfg) on the TOTOLINK router enables exploitation of a public-facing web application (T1190) to execute arbitrary OS commands, facilitating abuse of network device command-line interface components (T1059.008).

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