CVE-2015-5754

Related Files

OS X Suid Privilege Escalation

Posted Sep 14, 2015

Authored by Google Security Research, Ian Beer

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

SHA-256 | 1fd4f2bf985f7460d71d17680841dc5c059fe7c05b9a7ac1a776291868ff74e3

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