Description
Integer signedness error in the amd64_set_ldt function in sys/amd64/amd64/sys_machdep.c in FreeBSD 9.3 before p39, 10.1 before p31, and 10.2 before p14 allows local users to cause a denial of service (kernel panic) via an i386_set_ldt system call, which triggers a heap-based buffer overflow.
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
Exploit-DB 1
- FreeBSD 10.2 (x64) - 'amd64_set_ldt' Heap Overflow EDB-39570 · dos · Mar 16, 2016 · verified
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
References
- 39570 exploit
- FreeBSD-SA-16:15 vendor-advisory
- http://www.coresecurity.com/advisories/freebsd-kernel-amd64setldt-heap-overflow
- 20160316 [CORE-2016-0005] - FreeBSD Kernel amd64_set_ldt Heap Overflow mailing-list
- 20160317 Re: [CORE-2016-0005] - FreeBSD Kernel amd64_set_ldt Heap Overflow mailing-list
- 1035309 vdb-entry
- 20160316 Re: [FD] [CORE-2016-0005] - FreeBSD Kernel amd64_set_ldt Heap Overflow mailing-list
- 20160316 [CORE-2016-0005] - FreeBSD Kernel amd64_set_ldt Heap Overflow mailing-list
- http://packetstormsecurity.com/files/136276/FreeBSD-Kernel-amd64_set_ldt-Heap-Overflow.html