Bug 188148 – app-emulation/bochs DoS and heap overflow (CVE 2007-28{93,94})

• Product: Gentoo Security
• Status: RESOLVED FIXED

[Description Matt Fleming (RETIRED) 2007-08-08 19:10:26 UTC]

Tavis Ormandy discovered two issues that affect bochs <= 2.3

The first issue is caused by a heap overflow error in the emulated NE2000 device that allows a large value in the TXCNT register to exceed the available memory, which could be exploited by an attacker with "root" privileges on a vulnerable guest system to execute arbitrary code on the host system.

The second vulnerability is caused by a divide-by-zero in the emulated floppy disk controller, which could be exploited by malicious users to terminate the bochs process, creating a denial of service condition.

http://www.frsirt.com/english/advisories/2007/1936

[Comment 1 Matt Fleming (RETIRED) 2007-08-08 19:16:38 UTC]

CC'ing maintainer and setting whiteboard status.

[Comment 2 Sune Kloppenborg Jeppesen (RETIRED) 2007-08-14 10:45:47 UTC]

Debian seems to have fixed this with DSA 1351-1.

[Comment 3 Carlo Marcelo Arenas Belon 2007-09-03 21:30:26 UTC]

fedora also published a fix which links to the following already closed (in cvs) upstream bug report :

http://sourceforge.net/tracker/?func=detail&atid=112580&aid=1729822&group_id=12580

fedora's CVS contains patches for both bugs that apply to 2.3 in :

http://cvs.fedoraproject.org/viewcvs/devel/bochs/

[Comment 4 Carlo Marcelo Arenas Belon 2007-09-03 22:29:14 UTC]

Created attachment 129950 [details, diff]
fix for CVE-2007-2893 from CVS

reconstructed from CVS with information from fedora package.

tested in bochs-2.3 for amd64

[Comment 5 Carlo Marcelo Arenas Belon 2007-09-03 22:30:22 UTC]

Created attachment 129952 [details, diff]
fix for CVE-2007-2894 from CVS

reconstructed from CVS with information from fedora package.

tested in bochs-2.3 for amd64

[Comment 6 Sune Kloppenborg Jeppesen (RETIRED) 2007-09-08 15:32:57 UTC]

lu_zero please advise.

[Comment 7 Luca Barbato 2007-09-09 00:10:24 UTC]

bochs-2.3 doesn't build for me and I'm tempted to remove it since qemu covers the needs in a simpler and faster way. I'll try to come up either with a snapshot that builds or using the patches on the previous version.

[Comment 8 Luca Barbato 2007-09-09 11:47:33 UTC]

spent more time on bochs-2.3 and eventually sorted my, seems to be, local issue.

Ebuild committed as ~arch

[Comment 9 Christian Faulhammer (RETIRED) 2007-09-09 11:52:12 UTC]

Arches please stabilise app-emulation/bochs-2.3

[Comment 10 Christian Faulhammer (RETIRED) 2007-09-09 16:10:53 UTC]

lu_zero did ppc and x86 has been stabled by me

[Comment 11 Raúl Porcel (RETIRED) 2007-09-10 09:57:22 UTC]

alpha stable

[Comment 12 Christoph Mende (RETIRED) 2007-09-16 15:08:00 UTC]

amd64 stable

[Comment 13 Christian Faulhammer (RETIRED) 2007-09-16 16:51:54 UTC]

Please file GLSA request

[Comment 14 Pierre-Yves Rofes (RETIRED) 2007-09-29 14:10:35 UTC]

(In reply to comment #13)
> Please file GLSA request
> 
done.

[Comment 15 Pierre-Yves Rofes (RETIRED) 2007-11-18 00:21:26 UTC]

GLSA 200711-21