GLSA-200407-03 : Apache 2: Remote denial of service attack
Medium Nessus Plugin ID 14536
SynopsisThe remote Gentoo host is missing one or more security-related patches.
DescriptionThe remote host is affected by the vulnerability described in GLSA-200407-03 (Apache 2: Remote denial of service attack)
A bug in the protocol.c file handling header lines will cause Apache to allocate memory for header lines starting with TAB or SPACE.
An attacker can exploit this vulnerability to perform a Denial of Service attack by causing Apache to exhaust all memory. On 64 bit systems with more than 4GB of virtual memory a possible integer signedness error could lead to a buffer based overflow causing Apache to crash and under some circumstances execute arbitrary code as the user running Apache, usually 'apache'.
There is no known workaround at this time. All users are encouraged to upgrade to the latest available version:
SolutionApache 2 users should upgrade to the latest version of Apache:
# emerge sync # emerge -pv '>=www-servers/apache-2.0.49-r4' # emerge '>=www-servers/apache-2.0.49-r4'