Apache2 MOD_CGI STDERR Denial Of Service Vulnerability

BID:8725

Info

Apache2 MOD_CGI STDERR Denial Of Service Vulnerability

Bugtraq ID: 8725
Class: Failure to Handle Exceptional Conditions
CVE:
Remote: No
Local: Yes
Published: Sep 29 2003 12:00AM
Updated: Sep 29 2003 12:00AM
Credit: This issue was announced in an Apache Bug Database bug entry.
Vulnerable: Apache Apache 2.0.47
+ Apple Mac OS X Server 10.3.5
+ Apple Mac OS X Server 10.3.4
+ Apple Mac OS X Server 10.3.3
+ Apple Mac OS X Server 10.3.2
+ Apple Mac OS X Server 10.3.1
+ Apple Mac OS X Server 10.3
+ Apple Mac OS X Server 10.2.8
+ Apple Mac OS X Server 10.2.7
+ Apple Mac OS X Server 10.2.6
+ Apple Mac OS X Server 10.2.5
+ Apple Mac OS X Server 10.2.4
+ Apple Mac OS X Server 10.2.3
+ Apple Mac OS X Server 10.2.2
+ Apple Mac OS X Server 10.2.1
+ Apple Mac OS X Server 10.2
+ Apple Mac OS X Server 10.1.5
+ Apple Mac OS X Server 10.1.4
+ Apple Mac OS X Server 10.1.3
+ Apple Mac OS X Server 10.1.2
+ Apple Mac OS X Server 10.1.1
+ Apple Mac OS X Server 10.1
+ Mandriva Linux Mandrake 9.2 amd64
 + Mandriva Linux Mandrake 9.2
+ Mandriva Linux Mandrake 9.1 ppc
 + Mandriva Linux Mandrake 9.1
Apache Apache 2.0.46
+ Redhat Desktop 3.0
+ Redhat Enterprise Linux AS 3
 + Redhat Enterprise Linux ES 3
 + Redhat Enterprise Linux WS 3
 + Trustix Secure Linux 2.0
Apache Apache 2.0.45
- Apple Mac OS X 10.2.6
- Apple Mac OS X 10.2.5
- Apple Mac OS X 10.2.4
- Apple Mac OS X 10.2.3
- Apple Mac OS X 10.2.2
- Apple Mac OS X 10.2.1
- Apple Mac OS X 10.2
- Apple Mac OS X 10.1.5
- Apple Mac OS X 10.1.4
- Apple Mac OS X 10.1.3
- Apple Mac OS X 10.1.2
- Apple Mac OS X 10.1.1
- Apple Mac OS X 10.1
- Apple Mac OS X 10.1
- Apple Mac OS X 10.0.4
- Apple Mac OS X 10.0.3
- Apple Mac OS X 10.0.2
- Apple Mac OS X 10.0.1
- Apple Mac OS X 10.0
Apache Apache 2.0.44
Apache Apache 2.0.43
Apache Apache 2.0.42
+ Gentoo Linux 1.4 _rc1
 + Gentoo Linux 1.2
Apache Apache 2.0.41
Apache Apache 2.0.40
+ Redhat Linux 9.0 i386
 + Redhat Linux 8.0
+ Terra Soft Solutions Yellow Dog Linux 3.0
Apache Apache 2.0.39
Apache Apache 2.0.38
Apache Apache 2.0.37
Apache Apache 2.0.36
Apache Apache 2.0.35
Apache Apache 2.0.32
Apache Apache 2.0.28
Apache Apache 2.0 a9
Apache Apache 2.0
Not Vulnerable:

Discussion

Apache2 MOD_CGI STDERR Denial Of Service Vulnerability

Apache2 has been reported prone to a denial-of-service vulnerability. The issue has been reported to present itself when a CGI script outputs excessive data to STDERR. If this condition occurs the execution of the script will reportedly pause indefinitely due to a locked write() call in mod_cgi. Because Apache2 is waiting for further input from the malicious CGI application, the httpd process may hang. When the maximum connection limit is reached, Apache will no longer service requests, effectively denying service to legitimate users.

Exploit / POC

Apache2 MOD_CGI STDERR Denial Of Service Vulnerability

Currently we are not aware of any exploits for this issue. If you feel we are in error or are aware of more recent information, please mail us at: [email protected] <mailto:[email protected]>.

Solution / Fix

Apache2 MOD_CGI STDERR Denial Of Service Vulnerability

Solution:
The vendor has announced that this issue has been addressed in the latest CVS release.

Mandrake has released an updated security advisory (MDKSA-2003:096-1) to address this issue. Previous fixes did not sufficiently correct the problem, and caused issues with other applications on affected hosts. Affected users are advised to apply fixes as soon as possible. Further information regarding obtaining and applying fixes is available in the referenced advisory.

HP has released advisory HPSBUX0310-285 to address this issue.


Apache Apache 2.0.44

Apache Apache 2.0.47

References

Apache2 MOD_CGI STDERR Denial Of Service Vulnerability

References:

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