Privilege Escalation via Improper Write Access Check in FreeBSD 9.0 through 9.1-RELEASE-p4

CVE-2013-2171 · MEDIUM Severity

AV:L/AC:M/AU:N/C:C/I:C/A:C

The vm_map_lookup function in sys/vm/vm_map.c in the mmap implementation in the kernel in FreeBSD 9.0 through 9.1-RELEASE-p4 does not properly determine whether a task should have write access to a memory location, which allows local users to bypass filesystem write permissions and consequently gain privileges via a crafted application that leverages read permissions, and makes mmap and ptrace system calls.

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