National Vulnerability Database

National Vulnerability Database

National Vulnerability
Database

CVE-2012-2100 Detail

Current Description

The ext4_fill_flex_info function in fs/ext4/super.c in the Linux kernel before 3.2.2, on the x86 platform and unspecified other platforms, allows user-assisted remote attackers to trigger inconsistent filesystem-groups data and possibly cause a denial of service via a malformed ext4 filesystem containing a super block with a large FLEX_BG group size (aka s_log_groups_per_flex value). NOTE: this vulnerability exists because of an incomplete fix for CVE-2009-4307.

Source:  MITRE
View Analysis Description

Impact

CVSS v2.0 Severity and Metrics:

Base Score: 7.1 HIGH
Vector: (AV:N/AC:M/Au:N/C:N/I:N/A:C) (V2 legend)
Impact Subscore: 6.9
Exploitability Subscore: 8.6


Access Vector (AV): Network
Access Complexity (AC): Medium
Authentication (AU): None
Confidentiality (C): None
Integrity (I): None
Availability (A): Complete
Additional Information:
Victim must voluntarily interact with attack mechanism
Allows disruption of service

References to Advisories, Solutions, and Tools

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Hyperlink Resource
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=d50f2ab6f050311dbf7b8f5501b25f0bf64a439b Patch
http://rhn.redhat.com/errata/RHSA-2012-1445.html
http://rhn.redhat.com/errata/RHSA-2012-1580.html
http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.2.2
http://www.openwall.com/lists/oss-security/2012/04/12/11
http://www.securityfocus.com/bid/53414
https://bugzilla.redhat.com/show_bug.cgi?id=809687
https://github.com/torvalds/linux/commit/d50f2ab6f050311dbf7b8f5501b25f0bf64a439b

Technical Details

Vulnerability Type (View All)

Known Affected Software Configurations Switch to CPE 2.3

Configuration 1 ( hide )
 cpe:/o:linux:linux_kernel:3.2::~~~~x86~
     Show Matching CPE(s)
 cpe:/o:linux:linux_kernel:::~~~~x86~
     Show Matching CPE(s)
Up to (including)
3.2.1


Change History

1 change record found - show changes

Quick Info

CVE Dictionary Entry:
CVE-2012-2100
NVD Published Date:
07/03/2012
NVD Last Modified:
02/07/2013