CVE-2014-125122: Stack Overflow

Description

A stack-based buffer overflow vulnerability exists in the tmUnblock.cgi endpoint of the Linksys WRT120N wireless router. The vulnerability is triggered by sending a specially crafted HTTP POST request with an overly long TM_Block_URL parameter to the endpoint. By exploiting this flaw, an unauthenticated remote attacker can overwrite memory in a controlled manner, enabling them to temporarily reset the administrator password of the device to a blank value. This grants unauthorized access to the router’s web management interface without requiring valid credentials.

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Weakness Type (CWE)

CWE-121 CWE-121

References

Other References

https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/auxiliary/admin/http/linksys_tmunblock_admin_reset_bof.rb https://web.archive.org/web/20210424073058/http://www.devttys0.com/2014/02/wrt120n-fprintf-stack-overflow/ https://www.exploit-db.com/exploits/31758 https://www.vulncheck.com/advisories/linksys-wrt120n-stack-based-buffer-overflow-admin-password-reset

Frequently Asked Questions

What is CVE-2014-125122? +

A stack-based buffer overflow vulnerability exists in the tmUnblock.cgi endpoint of the Linksys WRT120N wireless router. The vulnerability is triggered by sending a specially crafted HTTP POST request with an overly long TM_Block_URL parameter to the endpoint. By exploiting this flaw, an unauthenticated remote attacker can overwrite memory in a controlled manner, enabling them to temporarily reset the administrator password of the device to a blank value. This grants unauthorized access to the router’s web management interface without requiring valid credentials.

How do I check if I'm vulnerable to CVE-2014-125122? +

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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CVE-2014-125122