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Re: Re: CVE request: Android: vold stack buffer overflow
From: Nick Kralevich <nnk () google com>
Date: Wed, 9 Nov 2011 15:03:38 -0800

Hi Kurt / Dan,

Nick Kralevich here from the Android security team.

Google is a CNA (CVE Numbering Authority), and we've already assigned
this vulnerability CVE-2011-3874. To avoid confusion, I would
appreciate it if CVE-2011-3874 would be considered the authoritative
CVE for this vulnerability, and CVE-2011-4123 should be marked as a
duplicate. More information on the vold vulnerability, including a
patch, can be found at
http://code.google.com/p/android/issues/detail?id=21681

For the record, Google maintains several security contact mailing
lists.  In general, you can reach Google security by e-mailing
security () google com or visiting
http://www.google.com/about/corporate/company/security.html

For Android specific security issues, the preferred e-mail address is
security () android com, or you can visit
http://developer.android.com/resources/faq/security.html#issue

For Chrome specific security issues, the preferred e-mail address is
security () chromium org, or you can visit
http://dev.chromium.org/Home/chromium-security/reporting-security-bugs

In general, e-mailing security () google com will eventually get to
Chrome or Android, although it's faster to contact the product
specific security alias first.

Because Google is a CNA, we maintain our own pool of CVEs from Mitre.
Any of the addresses above can issue CVEs for Google related
vulnerabilities.

Thanks!
-- Nick Kralevich
   Android Security Team

On 11/08/2011 06:08 AM, Dan Rosenberg wrote:
On Tue, Nov 8, 2011 at 8:03 AM, Dan Rosenberg <dan.j.rosenberg () gmail com> wrote:
A local user with group "log" on Android may send a malformed message
to vold ("volume daemon"), causing a stack buffer overflow.  This has
been demonstrated to be exploitable to escalate privileges to root on
all Froyo (2.2.x) and Gingerbread (2.4.x)  devices via freeing an
arbitrary heap object and triggering a use-after-free condition [1].
It appears the bug was silently patched in Honeycomb (3.x), but note
that since Honeycomb is not open source, it does not fall within the
scope of this list.  Bug discovered and exploited by the Revolutionary
team [2].

Oops, a few minor corrections.

Typo: Gingerbread is 2.3.x.  Also, the vulnerability actually lives in
the libsysutils library, and was demonstrated to be exploitable via
vold, which makes use of the affected library function.  Sorry for the
noise.

-Dan

[1] https://github.com/revolutionary/zergRush/blob/master/zergRush.c
[2] http://revolutionary.io/

Please use CVE-2011-4123 for this issue.

--

-Kurt Seifried / Red Hat Security Response Team



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