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Linux io_submit L2TP Sendmsg Integer Overflow

Linux io_submit L2TP Sendmsg Integer Overflow
Posted Feb 25, 2016
Authored by Google Security Research, hawkes

In certain kernel versions it is possible to use the AIO subsystem (io_submit syscall) to pass size values larger than MAX_RW_COUNT to the networking subsystem's sendmsg implementation. In the L2TP PPP sendmsg implementation, a large size parameter can lead to an integer overflow and kernel heap corruption during socket buffer allocation. This could be exploited to allow local privilege escalation from an unprivileged user account.

tags | exploit, overflow, kernel, local
systems | linux
SHA-256 | 4e8facb5af3635bb5a75286e2815b09aff43b1be7ba523d3b34d41c5a7c53bed
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