CVE-2025-55581: dcs-825l Privilege Escalation — Exploit

Description

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.

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CVSS v3.1 Score

7.3

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L

Weakness Type (CWE)

CWE-269 CWE-269

CWE-306 Missing Authentication

CWE-494 CWE-494

Affected Products

Vendor	Product	Versions
dlink	dcs-825l_firmware	< 1.08.01
dlink	dcs-825l	All

References

Exploits

https://cybermaya.in/posts/Post-42/

Other References

https://legacy.us.dlink.com/pages/product.aspx?id=f9c0458bfe7b4ff3bf7fad1cf6fcc9a1 https://www.dlink.com/en/security-bulletin/

Frequently Asked Questions

What is CVE-2025-55581? +

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. It has a CVSS v3.1 base score of 7.3 (HIGH).

How severe is CVE-2025-55581? +

CVE-2025-55581 has a CVSS v3.1 score of 7.3 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-55581? +

CVE-2025-55581 affects products from dlink, specifically: dcs-825l, dcs-825l_firmware. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-55581? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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