CVE-2024-39788
Published: 14 January 2025
Summary
CVE-2024-39788 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-2024-39788 involves multiple external config control vulnerabilities in the nas.cgi set_ftp_cfg() functionality of the Wavlink AC3000 router running firmware version M33A8.V5030.210505. A specially crafted HTTP request can lead to permission bypass, with a specific configuration injection vulnerability in the ftp_name POST parameter. The vulnerability, published on 2025-01-14, is rated 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) and is associated with CWE-15 (External Control of File Name or Path).
An authenticated attacker with high privileges (PR:H) can exploit these vulnerabilities by sending a specially crafted HTTP request over the network (AV:N) with low complexity (AC:L) and no user interaction required (UI:N). Exploitation triggers permission bypass and configuration injection, resulting in high impacts to confidentiality, integrity, and availability, along with a change in scope (S:C).
Mitigation details are provided in the Talos Intelligence advisory TALOS-2024-2056, available at https://talosintelligence.com/vulnerability_reports/TALOS-2024-2056.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2024-38380
Vulnerability details
Multiple external config control vulnerabilities exist in the nas.cgi set_ftp_cfg() 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 vulnerability…
more
exists within the `ftp_name` POST parameter.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Direct exploitation of the router's public-facing nas.cgi web interface via crafted HTTP requests to achieve permission bypass and config injection.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Validates inputs like the ftp_name POST parameter to prevent configuration injection and external control of file name or path (CWE-15).
Restricts access to configuration change functions such as set_ftp_cfg() to authorized users only, mitigating permission bypass in config controls.
Enforces approved authorizations in nas.cgi to block permission bypass via specially crafted authenticated HTTP requests.