Bug 245650 (CVE-2008-4933)

Summary:	Linux Kernel<2.6.28-r1 "hfsplus_find_cat()" and "hfsplus_block_allocate()" DOS (CVE-2008-{4933,4934})
Product:	Gentoo Security	Reporter:	Stefan Behte (RETIRED) <craig>
Component:	Kernel	Assignee:	Gentoo Security <security>
Status:	RESOLVED FIXED
Severity:	minor	CC:	kernel
Priority:	High
Version:	unspecified
Hardware:	All
OS:	Linux
URL:	http://kernel.org/pub/linux/kernel/v2.6/testing/ChangeLog-2.6.28-rc1
Whiteboard:	[linux <2.6.27.5]
Package list:		Runtime testing required:	---

Description Stefan Behte (RETIRED) gentoo-dev

2008-11-05 12:19:31 UTC

1) A vulnerability is caused due to the "hfsplus_find_cat()" function
in fs/hfsplus/catalog.c not properly checking the catalog name length.
This can be exploited to crash a system by e.g. mounting a specially
crafted hfsplus file system.

2) A vulnerability is caused due to the "hfsplus_block_allocate()"
function in fs/hfsplus/bitmap.c not properly checking the return
values of "read_mapping_page()" function before using them. This can
be exploited to crash a system by e.g. mounting a specially crafted
hfsplus file system.

Info copied from secunia advisory SA32510.

Comment 1 Gordon Malm (RETIRED) gentoo-dev

2008-11-05 18:02:59 UTC

Patches are in stable-review for 2.6.27.  Not yet been added to 2.6.25/2.6.26 stable-queue.

http://git.kernel.org/?p=linux/kernel/git/stable/stable-queue.git;a=blob;f=review-2.6.27/hfsplus-fix-buffer-overflow-with-a-corrupted-image.patch;h=c1ed9581904ff6f4c6716e2f5c1bbf00a6575e1f;hb=5ec3cec5e9b2b11eeb1294668bd865fabe8437a8

http://git.kernel.org/?p=linux/kernel/git/stable/stable-queue.git;a=blob;f=review-2.6.27/hfsplus-check-read_mapping_page-return-value.patch;h=89be1a179372f3f861feab810102aa6bb3a24b52;hb=5ec3cec5e9b2b11eeb1294668bd865fabe8437a8

Comment 2 Gordon Malm (RETIRED) gentoo-dev

2008-11-12 07:11:19 UTC

These vulns are fixed in 2.6.27.5.  Beware however, neither of these were fixed in 2.6.25.20, nor 2.6.26.8.

Comment 3 kfm 2009-07-21 00:32:06 UTC

hardened-kernel unaffected at present time. Removing alias.

PS: genpatches-2.6.27-5 added 2.6.27.5. Also, the relevant patches were added to genpatches-2.6.26-4. =genpatches-2.6.25* remains vulnerable. However, hardened-sources-2.6.25-r13 does not because we independently folded in the necessary patches.