Bug 477464 – Kernel : ipv6: BUG_ON in fib6_add_rt2node() (CVE-2013-4125)

• Status: RESOLVED FIXED
• Product: Gentoo Security

[Description Agostino Sarubbo 2013-07-20 08:24:35 UTC]

From ${URL} :

If two router advertisment speaker announce seperate default gateways
with infinite timeout the kernel currently packs these routes together
into an ecmp route set. If one of the RA speaker now changes the
advertised expiration to a lower value and a third route with infinite
timeout pops up we end up with a BUG_ON.

Remote attacker could use this flaw to crash the system.

Fixed by:
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=307f2fb95e9b96b3577916e73d92e104f8f26494

Introduced by:
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=51ebd3181572af8d5076808dab2682d800f6da5d

Introduced in upstream version:
v3.7-rc1

[Comment 1 Tom Wijsman (TomWij) (RETIRED) 2013-07-20 17:48:35 UTC]

------------------------------------------------------------------------
r2443 | tomwij | 2013-07-20 19:48:05 +0200 (Sat, 20 Jul 2013) | 1 line

Commit security fixes for CVE-2013-4125 (fixes bug #477464), CVE-2013-4127 (fixes bug #477466) and CVE-2013-3129 (fixes bug #477468) to branches 3.8, 3.9, 3.10 and 3.11 were they are present and apply.
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[Comment 2 GLSAMaker/CVETool Bot 2013-08-30 01:29:33 UTC]

CVE-2013-4125 (http://nvd.nist.gov/nvd.cfm?cvename=CVE-2013-4125):
  The fib6_add_rt2node function in net/ipv6/ip6_fib.c in the IPv6 stack in the
  Linux kernel through 3.10.1 does not properly handle Router Advertisement
  (RA) messages in certain circumstances involving three routes that initially
  qualified for membership in an ECMP route set until a change occurred for
  one of the first two routes, which allows remote attackers to cause a denial
  of service (system crash) via a crafted sequence of messages.

[Comment 3 John Helmert III 2022-03-25 15:26:50 UTC]

Fix in 3.10.4 onward