The PackageManagerService class in
services/java/com/android/server/PackageManagerService.java in Android
1.5 through 1.5 CRB42 does not properly check developer certificates
during processing of sharedUserId requests at an application's
installation time, which allows remote user-assisted attackers to
access application data by creating a package that specifies a shared
user ID with an arbitrary application.
Note:References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
BUGTRAQ:20090522 [oCERT-2009-006] Android improper package verification when using shared uids
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