Bug 225461 (CVE-2008-1673)

Summary:	Kernel <2.6.25.5 asn1: additional sanity checking during BER decoding (CVE-2008-1673)
Product:	Gentoo Security	Reporter:	Robert Buchholz (RETIRED) <rbu>
Component:	Kernel	Assignee:	Gentoo Security <security>
Status:	RESOLVED FIXED
Severity:	normal	CC:	chainsaw, kernel
Priority:	High
Version:	unspecified
Hardware:	All
OS:	Linux
URL:	http://git.kernel.org/?p=linux/kernel/git/stable/linux-2.6.25.y.git;a=commit;h=33afb8403f361919aa5c8fe1d0a4f5ddbfbbea3c
Whiteboard:	[linux >2.6.23 <2.6.25.5]
Package list:		Runtime testing required:	---

Description Robert Buchholz (RETIRED) gentoo-dev

2008-06-08 22:28:17 UTC

asn1: additional sanity checking during BER decoding (CVE-2008-1673)

upstream commit: ddb2c43594f22843e9f3153da151deaba1a834c5

- Don't trust a length which is greater than the working buffer.
  An invalid length could cause overflow when calculating buffer size
  for decoding oid.

- An oid length of zero is invalid and allows for an off-by-one error when
  decoding oid because the first subid actually encodes first 2 subids.

- A primitive encoding may not have an indefinite length.

Thanks to Wei Wang from McAfee for report.

Comment 1 kfm 2009-07-20 19:01:24 UTC

hardened-kernel unaffected at present time. Removing alias.

PS: Anything using >=genpatches-2.6.25-6 is unaffected