CVE-2024-39787
Published: 14 January 2025
Summary
CVE-2024-39787 is a critical-severity Path Traversal (CWE-22) vulnerability in Wavlink Wl-Wn533A8 Firmware. Its CVSS base score is 9.1 (Critical).
Operationally, ranked at the 42.1th 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 SI-10 (Information Input Validation) and AC-3 (Access Enforcement).
Threat & Defense at a Glance
Threat & Defense Details
Mitigating Controls (NIST 800-53 r5)AI
Directly mitigates directory traversal in nas.cgi add_dir() and disk_part POST parameter by validating inputs to block malicious paths like '../'.
Enforces access control policies to prevent permission bypass and unauthorized file/directory access despite crafted HTTP requests.
Limits privileges of authenticated users to least necessary, reducing impact of high-privilege (PR:H) exploitation for arbitrary file access.
NVD Description
Multiple directory traversal vulnerabilities exist in the nas.cgi add_dir() 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 directory traversal vulnerability exists…
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within the `disk_part` POST parameter.
Deeper analysisAI
CVE-2024-39787 involves multiple directory traversal vulnerabilities in the nas.cgi add_dir() functionality of the Wavlink AC3000 router running firmware version M33A8.V5030.210505. These issues, tied to CWE-22, enable a specially crafted HTTP request to bypass permissions. A specific directory traversal vulnerability also exists within the `disk_part` POST parameter. The vulnerability carries 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 was published on 2025-01-14.
Exploitation requires an authenticated attacker with high privileges (PR:H) to send a malicious HTTP request, triggering the directory traversal and permission bypass. Successful attacks can achieve high impacts on confidentiality, integrity, and availability with a changed scope (S:C), potentially granting unauthorized access to arbitrary files and directories on the device.
Mitigation guidance is available in the Talos Intelligence advisory at https://talosintelligence.com/vulnerability_reports/TALOS-2024-2057.
Details
- CWE(s)