Synopsis :

The remote Debian host is missing a security-related update.

Description :

According to David Wagner, iDEFENSE and the Apache HTTP Server
Project, several remotely exploitable vulnerabilities have been found
in the Apache package, a commonly used webserver. These
vulnerabilities could allow an attacker to enact a denial of service
against a server or execute a cross scripting attack. The Common
Vulnerabilities and Exposures (CVE) project identified the following
vulnerabilities :

- CAN-2002-0839: A vulnerability exists on platforms using
System V shared memory based scoreboards. This
vulnerability allows an attacker to execute code under
the Apache UID to exploit the Apache shared memory
scoreboard format and send a signal to any process as
root or cause a local denial of service attack.
- CAN-2002-0840: Apache is susceptible to a cross site
scripting vulnerability in the default 404 page of any
web server hosted on a domain that allows wildcard DNS
lookups.

- CAN-2002-0843: There were some possible overflows in the
utility ApacheBench (ab) which could be exploited by a
malicious server.

- CAN-2002-1233: A race condition in the htpasswd and
htdigest program enables a malicious local user to read
or even modify the contents of a password file or easily
create and overwrite files as the user running the
htpasswd (or htdigest respectively) program.

- CAN-2001-0131: htpasswd and htdigest in Apache 2.0a9,
1.3.14, and others allows local users to overwrite
arbitrary files via a symlink attack.

This is the same vulnerability as CAN-2002-1233, which
was fixed in potato already but got lost later and was
never applied upstream.

- NO-CAN: Several buffer overflows have been found in the
ApacheBench (ab) utility that could be exploited by a
remote server returning very long strings.
These problems have been fixed in version 1.3.26-0woody3 for the
current stable distribution (woody) and in 1.3.9-14.3 for the old
stable distribution (potato). Corrected packages for the unstable
distribution (sid) are expected soon.

See also :

http://www.debian.org/security/2002/dsa-187

Solution :

Upgrade the Apache package immediately.

Risk factor :

High / CVSS Base Score : 7.5
(CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P)
CVSS Temporal Score : 5.9
(CVSS2#E:POC/RL:OF/RC:C)
Public Exploit Available : true