National Cyber-Alert System
Vulnerability Summary for CVE-2009-1072
Original release date:03/25/2009
Last revised:06/12/2009
Source:
US-CERT/NIST
Overview
nfsd in the Linux kernel before 2.6.28.9 does not drop the CAP_MKNOD capability before handling a user request in a thread, which allows local users to create device nodes, as demonstrated on a filesystem that has been exported with the root_squash option.
Impact
CVSS Severity (version 2.0):
Impact Subscore:
6.9
Exploitability Subscore:
3.9
CVSS Version 2 Metrics:
Access Vector: Locally exploitable
Access Complexity: Low
Authentication: Not required to exploit
Impact Type:Allows unauthorized modification
- Official Statement from Red Hat (05/12/2009)
-
Red Hat is aware of this issue and is tracking it via the following bug:
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=CVE-2009-1072
This issue has been rated as having moderate security impact. It affects Red Hat Enterprise Linux 2.1, 3, 4, 5, and Red Hat Enterprise MRG. This issue is not planned to be fixed in Red Hat Enterprise Linux 2.1 and 3, due to these products being in Production 3 of their maintenance life-cycles, where only qualified security errata of important or critical impact are addressed. Future kernel updates in Red Hat Enterprise Linux 4, 5, and Red Hat Enterprise MRG will address this flaw.
For further information about Errata Support Policy, visit: http://www.redhat.com/security/updates/errata/
References to Advisories, Solutions, and Tools
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External Source: XF
Name: linux-kernel-capmknod-security-bypass(49356)
External Source: VUPEN
Name: ADV-2009-0802
Type: Advisory
External Source: BID
Name: 34205
External Source: REDHAT
Name: RHSA-2009:1081
External Source: MLIST
Name: [oss-security] 20090323 CVE request: kernel: nfsd did not drop CAP_MKNOD for non-root
External Source: CONFIRM
Name: http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.28.9
External Source: DEBIAN
Name: DSA-1800
External Source: MLIST
Name: [linux-kernel] 20090311 VFS, NFS security bug? Should CAP_MKNOD and CAP_LINUX_IMMUTABLE be added to CAP_FS_MASK?
External Source: SECUNIA
Name: 35394
External Source: SECUNIA
Name: 35390
External Source: SECUNIA
Name: 35185
External Source: SECUNIA
Name: 35121
External Source: SECUNIA
Name: 34786
External Source: SECUNIA
Name: 34432
Type: Advisory
External Source: SECUNIA
Name: 34422
Type: Advisory
External Source: SUSE
Name: SUSE-SA:2009:031
External Source: SUSE
Name: SUSE-SA:2009:030
External Source: SUSE
Name: SUSE-SA:2009:028
External Source: SUSE
Name: SUSE-SA:2009:021
External Source: CONFIRM
Name: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=76a67ec6fb79ff3570dcb5342142c16098299911
