Cisco yesterday warned of a potential DoS risk affecting its popular line of Catalyst LAN switches. Catalyst switches running specific versions of Cisco CatOS software are vulnerable to a buffer overflow in an embedded HTTP server.
In an advisory issued yesterday Cisco warns: "If the HTTP server is enabled a buffer overflow can be remotely exploited which will cause the switch to fail and reload. The vulnerability can be exploited repeatedly and result in a denial of service."
Only users of Catalyst switches running CatOS versions from 5.4 up to and including 7.3 which contain a "cv" in the image name are affected. Cisco customers are advised to upgrade the CatOS software on their switches, either through Cisco's Software Centeror their resellers. Pending this affected users are advised to apply a workaround, which involves disabling the HTTP server on a vulnerable switch. ®