Bug 143093 – app-antivirus/clamav: <=0.88.3 boundary error

• Product: Gentoo Security
• Status: RESOLVED FIXED

[Description Raphael Marichez (Falco) (RETIRED) 2006-08-07 07:54:07 UTC]

Hi teams,

clamav is vulnerable :(

SA 21374:

"Description:
Damian Put has discovered a vulnerability in Clam AntiVirus, which can be exploited by malicious people to cause a DoS (Denial of Service) and potentially compromise a vulnerable system.

The vulnerability is caused due to an boundary error in the "pefromupx()" function in libclamav/upx.c when unpacking PE executable files compressed with UPX. This can be exploited to cause a heap-based buffer overflow via a specially crafted UPX compressed file.

Successful exploitation crashes the service and may allow execution of arbitrary code.

The vulnerability has been confirmed in versions 0.88.2 and 0.88.3. Other versions may also be affected.

Solution:
Disable the "ScanPE" option for clamd and start clamscan with the "--no-pe" option. Please note that this completely disables the scanning of PE files. Then block or filter PE files in some other way.

Provided and/or discovered by:
Damian Put

Original Advisory:
http://www.overflow.pl/adv/clamav_upx_heap.txt "

[Comment 1 Raphael Marichez (Falco) (RETIRED) 2006-08-07 07:55:32 UTC]

note that ScanPE is enabled by default

let's wait for a patch or update...

[Comment 2 Andrej Kacian (RETIRED) 2006-08-07 12:50:11 UTC]

0.88.4 is out, I'll commit the ebuild in few minutes

[Comment 3 Andrej Kacian (RETIRED) 2006-08-07 16:52:49 UTC]

Ebuild for 0.88.4 is in the tree now - by the power bestowed unto me by jaervosz, I'm CCing arch teams, please do your magic.

x86 has been stabilized by me already, after testing on two stable boxes.

[Comment 4 Jason Wever (RETIRED) 2006-08-07 17:46:32 UTC]

SPARC virus detected, all your arch are belong to us!

[Comment 5 Fernando J. Pereda (RETIRED) 2006-08-07 17:53:03 UTC]

Looks fine on Alpha.

[Comment 6 Scott Stoddard (RETIRED) 2006-08-07 18:05:33 UTC]

amd64 done.

[Comment 7 Luca Barbato 2006-08-07 18:11:41 UTC]

ppc follows

[Comment 8 Markus Rothe (RETIRED) 2006-08-07 23:31:59 UTC]

ppc64 stable

[Comment 9 Raphael Marichez (Falco) (RETIRED) 2006-08-08 00:27:46 UTC]

debian isn't updated yet, we may have a chance !  :)

[Comment 10 René Nussbaumer (RETIRED) 2006-08-08 02:12:46 UTC]

stable on hppa

[Comment 11 Raphael Marichez (Falco) (RETIRED) 2006-08-08 02:35:30 UTC]

Ready for GLSA ! :)

[Comment 12 Matthias Geerdsen (RETIRED) 2006-08-08 07:13:46 UTC]

GLSA 200608-13

thanks for the quick work on this one