Description
The udp6_ufo_fragment function in net/ipv6/udp_offload.c in the Linux kernel through 3.12, when UDP Fragmentation Offload (UFO) is enabled, does not properly perform a certain size comparison before inserting a fragment header, which allows remote attackers to cause a denial of service (panic) via a large IPv6 UDP packet, as demonstrated by use of the Token Bucket Filter (TBF) queueing discipline.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | linux | 3.11.10-1 | — |
| Debian 13 | linux | 3.11.10-1 | — |
| Debian 12 | linux | 3.11.10-1 | — |
References
- USN-2113-1 vendor-advisory
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=0e033e04c2678dbbe74a46b23fffb7bb918c288e
- USN-2117-1 vendor-advisory
- https://github.com/torvalds/linux/commit/0e033e04c2678dbbe74a46b23fffb7bb918c288e
- https://bugzilla.redhat.com/show_bug.cgi?id=1030015
- openSUSE-SU-2014:0205 vendor-advisory
- [oss-security] 20131113 CVE-2013-4563 -- Linux kernel: net: large udp packet over IPv6 over UFO-enabled device with TBF qdisc panic mailing-list