Bug 199967 – sys-auth/nss-mdns < 0.10 Denial of Service Vulnerability

• Status: RESOLVED FIXED
• Product: Gentoo Security

[Description Lars Hartmann 2007-11-22 11:21:50 UTC]

A vulnerability has been reported in nss-mdns, which can be exploited by malicious people to cause a DoS (Denial of Service).

The vulnerability is caused due to the use of miss-aligned data structures within the "_nss_mdns_gethostbyname2_r()" function in nss.c and can be exploited to crash an application using the library.

The vulnerability is reported in versions prior to 0.10 running on the ARM and SPARC architectures.

Solution:
Update to version 0.10.

Provided and/or discovered by:
Daniel Smolik

Original Advisory:
Debian:
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=423222
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=451428

nss-mdns:
http://0pointer.de/lennart/projects/nss-mdns/#news

Reproducible: Always

[Comment 1 Lars Hartmann 2007-11-22 11:23:08 UTC]

please have a look at it

[Comment 2 Lars Hartmann 2007-11-22 11:24:28 UTC]

corrected severity Level

[Comment 3 Saleem Abdulrasool (RETIRED) 2007-11-22 20:32:14 UTC]

nss-mdns-0.10 has been in the tree, please stable.

[Comment 4 Markus Meier 2007-11-23 15:29:59 UTC]

x86 stable and added quotes

[Comment 5 Samuli Suominen (RETIRED) 2007-11-23 22:13:01 UTC]

amd64 stable

[Comment 6 Brent Baude (RETIRED) 2007-11-24 04:37:39 UTC]

ppc stable

[Comment 7 Robert Buchholz (RETIRED) 2007-11-26 01:59:12 UTC]

This does not affect x86 and amd64 systems because they do not require strict alignment. While I am not sure about ppc, and only ARM and SPARC are mentioned affected, plus the impact is DoS, I vote NO.

[Comment 8 Pierre-Yves Rofes (RETIRED) 2007-11-26 08:14:40 UTC]

no too, closing.