Linux Kernel RDS Protocol Privilege Escalation Exploit

The Linux kernel is prone to a privilege escalation vulnerability that can be exploited by local unprivileged users to gain root access, because the RDS protocol does not properly check that the base address of a user-provided iovec struct points to a valid userspace address before using the __copy_to_user_inatomic() function to copy the data. By providing a kernel address as an iovec base and issuing a recvmsg() style socket call, a local user could write arbitrary data into kernel memory, thus escalating privileges to root.
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Tuesday, October 26, 2010 - 00:00