D-Link DCS-825L up to 1.08.01 mydlink-watch-dog.sh integrity check

Summaryinfo

A vulnerability, which was classified as critical, has been found in D-Link DCS-825L up to 1.08.01. Affected is an unknown function of the file mydlink-watch-dog.sh. This manipulation causes integrity check. This vulnerability appears as CVE-2025-55581. The attack requires local access. There is no available exploit.

Detailsinfo

A vulnerability has been found in D-Link DCS-825L up to 1.08.01 and classified as critical. Affected by this vulnerability is an unknown functionality of the file mydlink-watch-dog.sh. The manipulation with an unknown input leads to a integrity check vulnerability. The CWE definition for the vulnerability is CWE-354. The product does not validate or incorrectly validates the integrity check values or "checksums" of a message. This may prevent it from detecting if the data has been modified or corrupted in transmission. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

D-Link DCS-825L firmware version 1.08.01 and possibly prior versions contain an insecure implementation in the mydlink-watch-dog.sh script. The script monitors and respawns the `dcp` and `signalc` binaries without validating their integrity, origin, or permissions. An attacker with filesystem access (e.g., via UART or firmware modification) may replace these binaries to achieve persistent arbitrary code execution with root privileges. The issue stems from improper handling of executable trust and absence of integrity checks in the watchdog logic.

This vulnerability is known as CVE-2025-55581 since 08/13/2025. The exploitation appears to be easy. An attack has to be approached locally. Additional levels of successful authentication are necessary for exploitation. Technical details are known, but no exploit is available. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 08/26/2025).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• D-Link

Name

• DCS-825L

Version

• 1.08.01

License

• commercial

Website

• Vendor: https://www.dlink.com/

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