An issue was discovered in router/upnp/src/ssdp.c in DD-WRT before 45724. An unsafe strcpy in the UPnP handling functionality allows an unauthenticated remote attacker to send a request that would overflow an internal fixed buffer. Exploitation requires the DD-WRT user to enable UPnP (which is off by default, and only listens on internal interfaces by default). This occurs in ssdp_msearch (reachable by an M-SEARCH request).

DD-WRT 45723 - UPNP Buffer Overflow

DD-WRT version 45723 contains a buffer overflow vulnerability in the UPNP network discovery service that allows remote attackers to potentially execute arbitrary code. Attackers can send crafted M-SEARCH packets with oversized UUID payloads to trigger buffer overflow conditions on the target device.

Multiple cross-site request forgery (CSRF) vulnerabilities in apply.cgi in DD-WRT 24 sp2 allow remote attackers to hijack the authentication of administrators for requests that (1) execute arbitrary commands via the ping_ip parameter; (2) change the administrative credentials via the http_username and http_passwd parameters; (3) enable remote administration via the remote_management parameter; or (4) configure port forwarding via certain from, to, ip, and pro parameters. NOTE: This issue reportedly exists because of a "weak ... anti-CSRF fix" implemented in 24 sp2.

httpd.c in httpd in the management GUI in DD-WRT 24 sp1, and other versions before build 12533, allows remote attackers to execute arbitrary commands via shell metacharacters in a request to a cgi-bin/ URI.

httpd.c in httpd in the management GUI in DD-WRT 24 sp1 does not require administrative authentication for programs under cgi-bin/, which allows remote attackers to change settings via HTTP requests.

Multiple cross-site request forgery (CSRF) vulnerabilities in apply.cgi in DD-WRT 24 sp1 and earlier allow remote attackers to hijack the authentication of administrators for requests that (1) execute arbitrary commands via the ping_ip parameter; (2) change the administrative credentials via the http_username and http_passwd parameters; (3) enable remote administration via the remote_management parameter; or (4) configure port forwarding via certain from, to, ip, and pro parameters.

A memory corruption vulnerability exists in the httpd unescape functionality of DD-WRT Revision 32270 - Revision 48599. A specially-crafted HTTP request can lead to memory corruption. An attacker can send a network request to trigger this vulnerability.

An issue was discovered in DD-WRT through 16214. The Diagnostic page allows remote attackers to execute arbitrary commands via shell metacharacters in the host field of the ping command. Exploitation through CSRF might be possible. NOTE: software maintainers consider the report invalid because it refers to an old software version, requires administrative privileges, and does not provide access beyond that already available to administrative users

Command Injection vulnerability exists via a CSRF in DD-WRT 24-sp2 from specially crafted configuration values containing shell meta-characters, which could let a remote malicious user cause a Denial of Service.