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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linksys WRT120N
Default version status: unknown
1.0.07affected
References
- https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/auxiliary/admin/http/linksys_tmunblock_admin_reset_bof.rb ↗
- https://www.exploit-db.com/exploits/31758 ↗
- https://web.archive.org/web/20210424073058/http://www.devttys0.com/2014/02/wrt120n-fprintf-stack-overflow/ ↗
- https://www.vulncheck.com/advisories/linksys-wrt120n-stack-based-buffer-overflow-admin-password-reset ↗