full-disclosure - CAN-2004-1073 not fixed

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Date: Wed Mar 30 10:21:45 2005
From: martin.pitt at canonical.com (Martin Pitt)
Subject: CAN-2004-1073 not fixed

Hi!

Santosh Eraniose [2005-03-29 16:39 +0530]:
> On executing the PoC on 2.4.29 and 2.6.11 kernel we initially get
> no core dump. The following code introduced to fix another bug, caused
> the loading of the interpreter to fail.
> [...]
> With this change, on executing the PoC on 2.4.29 and 2.6.11,
> the core dump contains the suid executable.
> We used the strings command to check if the strings in the suid
> is present in the core.
> 
> So we find that the vulnerability of reading non-readable
> binaries exist in the latest kernel and the vendor provided patch
> for CAN-2004-1073 does not fix this vulnerability.

Confirmed.

I tried this on a security-patched 2.6.8.1 (Ubuntu 4.10) and 2.6.10
(Ubuntu 5.04) kernel. With the modified PoC I was able to read a
setuid binary with 4701 permissions on all kernels.

Martin
-- 
Martin Pitt               http://www.piware.de
Ubuntu Developer    http://www.ubuntulinux.org
Debian Developer         http://www.debian.org
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