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CVE-2015-5754

Status Candidate

Overview

Race condition in runner in Install.framework in the Install Framework Legacy component in Apple OS X before 10.10.5 allows attackers to execute arbitrary code in a privileged context via a crafted app that leverages incorrect privilege dropping associated with a locking error.

Related Files

OS X Suid Privilege Escalation
Posted Sep 14, 2015
Authored by Google Security Research, ianbeer

The Install.framework runner suid root binary does not correctly account for the fact that Distributed Objects can be connected to by multiple clients at the same time. By connecting two proxy objects to an IFInstallRunner and calling [IFInstallRunner makeReceiptDirAt:asRoot:] in the first and passing a custom object as the directory name we can get a callback to our code just after the makeReceiptDirAt code has called seteuid(0);setguid(0) to regain privs. Since BSD priviledges are per-process this means that our other proxy object will now have euid 0 without having to provide an authorization reference. In this second proxy we can then just call runTaskSecurely and get a root shell before returning from the first proxy's callback function which will then drop privs.

tags | exploit, shell, root
systems | linux, bsd
advisories | CVE-2015-5754
MD5 | 56bffdab05f4e18e4e17316125e04b4e
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