Bug 478276 – Kernel : net: panic while appending data to a corked IPv6 socket in ip6_append_data_mtu (CVE-2013-4163)

• Status: RESOLVED FIXED
• Product: Gentoo Security

[Description Agostino Sarubbo 2013-07-26 19:33:41 UTC]

From ${URL} :

Linux kernel built with the IPv6 networking support is vulnerable to a crash
while appending data to an IPv6 socket with UDP_CORKED option set. UDP_CORK
enables accumulating data and sending it as single datagram.

An unprivileged user/program could use this flaw to crash the kernel, resulting in local DoS.

Upstream fix:
=============
 -> https://git.kernel.org/linus/75a493e60ac4bbe2e977e7129d6d8cbb0dd236be

[Comment 1 GLSAMaker/CVETool Bot 2013-08-30 01:13:16 UTC]

CVE-2013-4163 (http://nvd.nist.gov/nvd.cfm?cvename=CVE-2013-4163):
  The ip6_append_data_mtu function in net/ipv6/ip6_output.c in the IPv6
  implementation in the Linux kernel through 3.10.3 does not properly maintain
  information about whether the IPV6_MTU setsockopt option had been specified,
  which allows local users to cause a denial of service (BUG and system crash)
  via a crafted application that uses the UDP_CORK option in a setsockopt
  system call.

[Comment 2 John Helmert III 2022-03-25 15:28:50 UTC]

Fix in 3.10.4 onwards