CVE-2024-39795
Published: 14 January 2025
Summary
CVE-2024-39795 is a critical-severity External Control of System or Configuration Setting (CWE-15) vulnerability in Wavlink Wl-Wn533A8 Firmware. Its CVSS base score is 9.1 (Critical).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 19.3th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
The strongest mitigations our analysis identified are NIST 800-53 AC-3 (Access Enforcement) and CM-5 (Access Restrictions for Change).
Deeper analysis
CVE-2024-39795 involves multiple external config control vulnerabilities in the nas.cgi set_nas() proftpd functionality of the Wavlink AC3000 router running firmware version M33A8.V5030.210505. These flaws allow a specially crafted HTTP request to bypass permissions, including a configuration injection vulnerability in the ftp_max_sessions POST parameter. The issue is classified under CWE-15 (External Control of System or Configuration Setting) with a CVSS v3.1 base score of 9.1 (AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H), indicating critical impact potential across confidentiality, integrity, and availability when scope is changed.
An authenticated attacker with high privileges can exploit these vulnerabilities by sending a malicious HTTP request to the affected nas.cgi endpoint. Successful exploitation leads to permission bypass and arbitrary configuration injection, enabling the attacker to alter ProFTPD settings such as maximum sessions, potentially disrupting services or escalating control over the device.
For mitigation details, refer to the Talos Intelligence advisory at https://talosintelligence.com/vulnerability_reports/TALOS-2024-2053, which provides analysis and recommendations specific to this vulnerability.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2024-38385
Vulnerability details
Multiple external config control vulnerabilities exist in the nas.cgi set_nas() proftpd functionality of Wavlink AC3000 M33A8.V5030.210505. A specially crafted HTTP request can lead to permission bypass. An attacker can make an authenticated HTTP request to trigger these vulnerabilities.A configuration injection…
more
vulnerability exists in the `ftp_max_sessions` POST parameter.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Vulnerability in public-facing nas.cgi endpoint enables authenticated config injection and permission bypass on network device.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly mitigates configuration injection vulnerability by validating HTTP POST parameters such as ftp_max_sessions in the nas.cgi set_nas() function.
Enforces approved authorizations to prevent permission bypass in the ProFTPD configuration functionality via specially crafted authenticated HTTP requests.
Restricts logical access to configuration change capabilities in nas.cgi, limiting high-privilege authenticated attackers from unauthorized ProFTPD modifications.