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Message-ID: <Pine.GSO.4.51.0812241251510.12707@faron.mitre.org>
Date: Wed, 24 Dec 2008 12:53:38 -0500 (EST)
From: "Steven M. Christey" <coley@...us.mitre.org>
To: oss-security@...ts.openwall.com
cc: "Steven M. Christey" <coley@...us.mitre.org>
Subject: Re: CVE request: kernel: watchdog: ib700wdt.c -
buffer_underflow bug
On Mon, 22 Dec 2008, Eugene Teo wrote:
> I discussed this with Wim, and it depends on the permissions for the
> miscdev device, /dev/watchdog. On Fedora, it's accessible by root user
> only.
One of our CVE analysts found a concrete case; how common it is, is
another question:
www.stlinux.com/docs/manual/distribution/distribution_guide17.php shows
an example of "crw-rw-rw-" permissions for /dev/watchdog. Thus, it is
plausible that the IOCTL call is available to unprivileged users in some
or all Linux distributions. Even if these permissions are not the
default, users might reasonably decide to manually set these permissions
if they happen to do a web search for "/dev/watchdog permissions" and
find this stlinux.com page.
Use CVE-2008-5702
- Steve
======================================================
Name: CVE-2008-5702
Status: Candidate
URL: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-5702
Reference: MLIST:[linux-kernel] 20081005 [PATCH 04/19] ib700wdt: Fix off by one
Reference: URL:http://lkml.org/lkml/2008/10/5/173
Reference: MLIST:[oss-security] 20081210 CVE request: kernel: watchdog: ib700wdt.c - buffer_underflow bug
Reference: URL:http://openwall.com/lists/oss-security/2008/12/10/2
Reference: MLIST:[oss-security] 20081216 Re: CVE request: kernel: watchdog: ib700wdt.c - buffer_underflow bug
Reference: URL:http://openwall.com/lists/oss-security/2008/12/17/6
Reference: MLIST:[oss-security] 20081217 Re: CVE request: kernel: watchdog: ib700wdt.c - buffer_underflow bug
Reference: URL:http://openwall.com/lists/oss-security/2008/12/17/9
Reference: MLIST:[oss-security] 20081217 Re: CVE request: kernel: watchdog: ib700wdt.c - buffer_underflow bug
Reference: URL:http://openwall.com/lists/oss-security/2008/12/17/20
Reference: CONFIRM:http://bugzilla.kernel.org/show_bug.cgi?id=11399
Reference: CONFIRM:http://git.kernel.org/?p=linux/kernel/git/stable/linux-2.6.27.y.git;a=commit;h=7c2500f17d65092d93345f3996cf82ebca17e9ff
Reference: CONFIRM:http://www.kernel.org/pub/linux/kernel/v2.6/testing/ChangeLog-2.6.28-rc1
Buffer underflow in the ibwdt_ioctl function in
drivers/watchdog/ib700wdt.c in the Linux kernel before 2.6.28-rc1
might allow local users to have an unknown impact via a certain
/dev/watchdog WDIOC_SETTIMEOUT IOCTL call.
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