Published on March 16, 2023, the CVE-2023-2528 vulnerability is a critical command injection flaw discovered in firmware version FW105B03 of the D-Link DIR820LA1 router. This vulnerability allows unauthenticated attackers to execute arbitrary commands with elevated privileges. Attackers can craft malicious input to inject commands into the router’s operating system, potentially gaining full control of the device. The vulnerability is actively exploited in real-world environments, posing a significant risk to affected systems, which could suffer from network compromise, data theft, or further attacks on internal network resources.

Technical Summary

A critical operating system command injection vulnerability has been identified in the D-Link DIR-820LA1_FW105B03 router. This vulnerability allows attackers to elevate privileges to root by exploiting a specially crafted payload targeting the ping_addr parameter. The command injection resides in the pingV4Msg function of the /ping.ccp component, creating a serious risk for internet-connected devices. The vulnerable function, located in the /sbin/ncc2 directory, retrieves the content of the ping_addr variable from requests to /ping.ccp, providing a path for command execution.

Despite attempts to filter malicious input, the function does not adequately sanitize certain symbols, such as %0a and $, allowing attackers to bypass defenses. This vulnerability is actively exploited in real-world environments, making immediate action crucial to protect affected systems from potential network compromise, data theft, or further attacks on internal resources.

Recommendations

• Firmware Update: Users must immediately check their router’s firmware version and update to a patched version to mitigate the risk associated with this vulnerability.

• Input Filtering: Implement additional security measures, such as strict input validation, to prevent command injection attempts.

[Callforaction-THREAT-Footer]