OpenSSH < 5.9 Multiple DoS
Medium Nessus Plugin ID 17703
Synopsis
The SSH server on the remote host has multiple denial of service vulnerabilities.
Description
According to its banner, the version of OpenSSH running on the remote host is prior to version 5.9. Such versions are affected by multiple denial of service vulnerabilities :
- A denial of service vulnerability exists in the gss-serv.c 'ssh_gssapi_parse_ename' function. A remote attacker may be able to trigger this vulnerability if gssapi-with-mic is enabled to create a denial of service condition via a large value in a certain length field.
(CVE-2011-5000)
- On FreeBSD, NetBSD, OpenBSD, and other products, a remote, authenticated attacker could exploit the remote_glob() and process_put() functions to cause a denial of service (CPU and memory consumption).
(CVE-2010-4755)
Solution
Upgrade to OpenSSH 5.9 or later.