Xinetd Open File Descriptor Denial Of Service Vulnerability

BID:5458

Info

Xinetd Open File Descriptor Denial Of Service Vulnerability

Bugtraq ID: 5458
Class: Design Error
CVE:
Remote: No
Local: Yes
Published: Aug 13 2002 12:00AM
Updated: Aug 13 2002 12:00AM
Credit: This vulnerability was discovered during an audit of Xinetd by Solar Designer <[email protected]>.
Vulnerable: Xinetd Xinetd 2.3.6
+ MandrakeSoft Corporate Server 2.1
+ Mandriva Linux Mandrake 8.2 ppc
 + Mandriva Linux Mandrake 8.2
Xinetd Xinetd 2.3.5
+ Gentoo Linux 0.7
+ Gentoo Linux 0.5
Xinetd Xinetd 2.3.4
HP Secure OS software for Linux 1.0
Conectiva Linux Enterprise Edition 1.0
Not Vulnerable: Xinetd Xinetd 2.3.7
+ Mandriva Linux Mandrake 9.0

Discussion

Xinetd Open File Descriptor Denial Of Service Vulnerability

xinetd is vulnerable to a denial of service condition due to inadvertent file descriptor inheritance.

The vulnerability is the result of file descriptors for the signal pipe being inherited by child processes launched by xinetd. This may result in a malicious attacker access to pipes associated with xinetd thus having the ability to communicate with xinetd.

Exploit / POC

Xinetd Open File Descriptor 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

Xinetd Open File Descriptor Denial Of Service Vulnerability

Solution:
Gentoo Linux recommends that all users who are running sys-apps/xinetd-2.3.5 and earlier update their systems by running the following commands:

emerge rsync
emerge xinetd
emerge clean

MandrakeSoft has stated that Linux Mandrake 8.2 is affected. Fixes are available for i586 and PPC platforms. Further details are available in the referenced advisory.

FreeBSD has released upgrades. Users are advised to upgrade their Ports
collection and reinstall the affected port.

RedHat has released an advisory. Fixes are available for i386 and alpha platforms.

Conectiva has also released an advisory (CLSA-2003:790) including a fix to address this issue in CLEE 1.0.

HP has released bulletin HPSBTL0211-0076 to provide fixes for this issue.

The following fixes are available:


HP Secure OS software for Linux 1.0

Conectiva Linux Enterprise Edition 1.0

Xinetd Xinetd 2.3.4

Xinetd Xinetd 2.3.5

Xinetd Xinetd 2.3.6

References

Xinetd Open File Descriptor Denial Of Service Vulnerability

References:

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