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.
Metrics
Affected Vendors & Products
References
History
No history.

Status: PUBLISHED
Assigner: mitre
Published:
Updated: 2024-08-05T21:53:06.785Z
Reserved: 2017-10-03T00:00:00
Link: CVE-2017-1000112

No data.

Status : Modified
Published: 2017-10-05T01:29:04.477
Modified: 2024-11-21T03:04:11.513
Link: CVE-2017-1000112
