[ltt-dev] [geissert@debian.org: Bug#598309: ust-bin: CVE-2010-3386: insecure library loading]

[jbernard@debian.org (Jon Bernard)]

I just received this bug report and wanted to forward it here to get any
thoughts and/or opinions.

-- 
Jon

----- Forwarded message from Raphael Geissert <geissert at debian.org> -----

Date: Tue, 28 Sep 2010 04:23:22 +0000
From: Raphael Geissert <geissert@debian.org>
To: submit at bugs.debian.org
Subject: Bug#598309: ust-bin: CVE-2010-3386: insecure library loading
Reply-To: Raphael Geissert <geissert at debian.org>, 598309 at bugs.debian.org

Package: ust-bin
Version: 0.7-1
Severity: grave
Tags: security
User: team at security.debian.org
Usertags: ldpath

Hello,

During a review of the Debian archive, I've found your package to
contain a script that can be abused by an attacker to execute arbitrary
code.

The vulnerability is introduced by an insecure change to
LD_LIBRARY_PATH, and environment variable used by ld.so(8) to look for
libraries on a directory other than the standard paths.

Vulnerable code follows:

/usr/bin/usttrace line 136:
	    export LD_LIBRARY_PATH="$LD_LIBRARY_PATH:${LIBUST_PATH%libust.so}"
/usr/bin/usttrace line 144:
	    export LD_LIBRARY_PATH="$LD_LIBRARY_PATH:${LIBUST_PATH%libust.so}"

When there's an empty item on the colon-separated list of
LD_LIBRARY_PATH, ld.so treats it as '.' (i.e. CWD/$PWD.)
If the given script is executed from a directory where a potential,
local, attacker can write files to, there's a chance to exploit this
bug.

This vulnerability has been assigned the CVE id CVE-2010-3386. Please make sure
you mention it when forwarding this report to upstream and when fixing
this bug (everywhere: upstream and here at Debian.)

[0] http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-3386
[1] http://security-tracker.debian.org/tracker/CVE-2010-3386

Sincerely,
Raphael Geissert



----- End forwarded message -----