#2009-006 Android improper package verification when using shared uids

Description:

Android, an open source mobile phone platform, improperly checks developer
certificates when installing packages that request the shared user identifier
(uid) permission.

Normally, Android applications will be allowed to share a uid if the
packages are all signed by the same developer certificate and request
permission to do so at install-time.  This allows for packages from the
same author to share data.  Without enforcement of that behavior, it is
possible for any application to be installed in such a manner that it
gains access to another (existing) application's data.

A patch has been made available by Android (see references).


Affected version:

Android >= 1.5 CRB17 <= 1.5 CRB42


Fixed version:

Android >= 1.5 CRB43
(Android 1.0 and 1.1 are not affected)


Credit: Panasonic


CVE: CVE-2009-1754


Timeline:
2009-05-14: Panasonic reported the issue to the Android Security Team
2009-05-18: Android Security Team requested assistance from oCERT
2009-05-19: oCERT requested CVE assignment
2009-05-22: CVE assigned
2009-05-22: advisory release


References:
http://android.git.kernel.org/?p=platform/frameworks/base.git;a=commit;h=5d6d773fab559fdc12e553d60d789f3991ac552c

Links:
http://android.git.kernel.org
http://android.com

Permalink:
http://www.ocert.org/advisories/ocert-2009-006.html


--
Will Drewry <redpig@ocert.org>
oCERT Team :: http://ocert.org