Mach Race OSX – Local Privilege Escalation
Source: https://github.com/gdbinit/mach_race Mach Race OS X Local Privilege Escalation Exploit (c) fG! 2015, 2016, reverser@put.as - https://reverse.put.as A SUID, SIP, and binary entitlements universal OS X exploit (CVE-2016-1757). Usage against a SUID binary: ./mach_race_server /bin/ps _compat_mode for i in seq 0 1000000; do ./mach_race_client /bin/ps; done Against an entitled binary to bypass SIP: ./mach_race_server /System/Library/PrivateFrameworks/PackageKit.framework/Versions/A/Resources/system_shove _geteuid for i in seq 0 1000000; do ./mach_race_client /System/Library/PrivateFrameworks/PackageKit.framework/Versions/A/Resources/system_shove; done Note: because the service name is not modified you can't chain this exploit from user to root and then use it to bypass SIP since bootstrap_register2 will fail the second time (service is already registered with launchd from the first run). The solution is to add a parameter to use a different service name for example. Note2: there's no need to make this into two separate apps, a single binary works, you just need to fork a server and client. References: https://reverse.put.as/wp-content/uploads/2016/04/SyScan360_SG_2016_-_Memory_Corruption_is_for_wussies.pdf http://googleprojectzero.blogspot.pt/2016/03/race-you-to-kernel.html Tested against Mavericks 10.10.5, Yosemite 10.10.5, El Capitan 10.11.2 and 10.11.3. Fixed in El Capitan 10.11.4. Should work with all OS X versions (depends if bootstrap_register2 exists on older versions). Alternative implementation with bootstrap_create_server possible for older versions. Proof of Concept: https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/39741.zip |