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Re: CVE Request: glibc getaddrinfo() stack overflow
From: Kurt Seifried <kseifried () redhat com>
Date: Wed, 03 Apr 2013 09:06:00 -0600

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On 04/03/2013 05:10 AM, Marcus Meissner wrote:
Hi,

A customer reported a glibc crash, which turned out to be a stack
overflow in getaddrinfo().

getaddrinfo() uses: struct sort_result results[nresults]; with
nresults controlled by the nameservice chain (DNS or /etc/hosts).

This will be visible mostly on threaded applications with smaller
stacksizes, or operating near out of stack.

Reproducer I tried: $ for i in `seq 1 10000000`; do echo "ff00::$i
a1" >>/etc/hosts; done $ ulimit -s 1024 $ telnet a1 Segmentation
fault (clean out /etc/hosts again )


I am not sure you can usually push this amount of addresses via DNS
for all setups.

Andreas is currently pushing the patch to glibc GIT.

Reference: https://bugzilla.novell.com/show_bug.cgi?id=813121

Ciao, Marcus

Please use CVE-2013-1914 for this issue.

- -- 
Kurt Seifried Red Hat Security Response Team (SRT)
PGP: 0x5E267993 A90B F995 7350 148F 66BF 7554 160D 4553 5E26 7993
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