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.
History

No history.

cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published: 2017-10-04T01:00:00

Updated: 2024-08-05T21:53:06.785Z

Reserved: 2017-10-03T00:00:00

Link: CVE-2017-1000112

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Modified

Published: 2017-10-05T01:29:04.477

Modified: 2024-11-21T03:04:11.513

Link: CVE-2017-1000112

cve-icon Redhat

Severity : Important

Publid Date: 2017-08-10T00:00:00Z

Links: CVE-2017-1000112 - Bugzilla