UBUNTU-CVE-2017-1000112

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UBUNTU-CVE-2017-1000112

Summary:

Details: Linux kernel: Exploitable memory corruption due to UFO to non-UFO path switch. When building a UFO packet with MSG_MORE __ip_append_data() calls ip_ufo_append_data() to append. However in between two send() calls, the append path can be switched from UFO to non-UFO one, which leads to a memory corruption. In case UFO packet lengths exceeds MTU, copy = maxfraglen - skb->len becomes negative on the non-UFO path and the branch to allocate new skb is taken. This triggers fragmentation and computation of fraggap = skb_prev->len - maxfraglen. Fraggap can exceed MTU, causing copy = datalen - transhdrlen - fraggap to become negative. Subsequently skb_copy_and_csum_bits() writes out-of-bounds. A similar issue is present in IPv6 code. The bug was introduced in e89e9cf539a2 ("[IPv4/IPv6]: UFO Scatter-gather approach") on Oct 18 2005.

References: https://ubuntu.com/security/CVE-2017-1000112, https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=85f1bd9a7b5a79d5baa8bf44af19658f7bf77bfa, https://ubuntu.com/security/notices/USN-3384-1, https://ubuntu.com/security/notices/USN-3384-2, https://ubuntu.com/security/notices/USN-3385-1, https://ubuntu.com/security/notices/USN-3385-2, https://ubuntu.com/security/notices/USN-3386-1, https://ubuntu.com/security/notices/USN-3386-2, https://www.cve.org/CVERecord?id=CVE-2017-1000112