Overview
A critical security vulnerability, CVE-2025-10773, has been discovered in B-Link BL-AC2100 up to 1.0.3. This vulnerability primarily affects the Web Management Interface component of the system. It is particularly concerning because the attack can be executed remotely, and the exploit has been made public, increasing the chances of malicious attempts.
The flaw lies in the function delshrpath of the file /goform/set_delshrpath_cfg. The manipulation of the argument Type results in a stack-based buffer overflow, which can potentially lead to a system compromise or data leakage. The vendor, unfortunately, has not responded to the disclosure, increasing the risk factor for users of the affected product.
Vulnerability Summary
CVE ID: CVE-2025-10773
Severity: High (CVSS: 8.8)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise and data leakage
Affected Products
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Product | Affected Versions
B-Link BL-AC2100 | up to 1.0.3
How the Exploit Works
The exploit takes advantage of a stack-based buffer overflow vulnerability in the Web Management Interface of the B-Link BL-AC2100. Specifically, the vulnerability lies in the “delshrpath” function of the “/goform/set_delshrpath_cfg” file.
An attacker can manipulate the “Type” argument to overflow the buffer. This overflow can lead to arbitrary code execution, potentially granting the attacker full control over the system. The attacker can perform this exploit from a remote location, making it a severe and widespread threat.
Conceptual Example Code
The following is a conceptual example of how this vulnerability might be exploited. Please note that this is pseudocode and should not be used for malicious purposes.
POST /goform/set_delshrpath_cfg HTTP/1.1
Host: target.example.com
Content-Type: application/json
{
"Type": "A"*1000
}In the above example, the “Type” argument is filled with a large number of “A” characters, far exceeding the buffer’s capacity, causing it to overflow and potentially executing arbitrary code on the system.
Mitigation and Prevention
As of now, the vendor has yet to respond with a patch. However, as a temporary measure, users can apply Web Application Firewall (WAF) or Intrusion Detection System (IDS) to mitigate potential attacks. It is also advisable to regularly monitor and update all systems to prevent potential vulnerabilities.
