oCERT Advisories

#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.

Affected version:

Android >= 1.5 CRB17, <= 1.5 CRB42

Fixed version:

Android >= 1.5 CRB43

(Android 1.0 and 1.1 are unaffected.)

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: assigned CVE
2009-05-22: advisory release

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

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

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