National Vulnerability Database

National Vulnerability Database

National Vulnerability
Database

CVE-2009-1897 Detail

Description

The tun_chr_poll function in drivers/net/tun.c in the tun subsystem in the Linux kernel 2.6.30 and 2.6.30.1, when the -fno-delete-null-pointer-checks gcc option is omitted, allows local users to gain privileges via vectors involving a NULL pointer dereference and an mmap of /dev/net/tun, a different vulnerability than CVE-2009-1894.

Source:  MITRE
Description Last Modified:  07/20/2009

Impact

CVSS v2.0 Severity and Metrics:

Base Score: 6.9 MEDIUM
Vector: (AV:L/AC:M/Au:N/C:C/I:C/A:C) (V2 legend)
Impact Subscore: 10.0
Exploitability Subscore: 3.4


Access Vector (AV): Local
Access Complexity (AC): Medium
Authentication (AU): None
Confidentiality (C): Complete
Integrity (I): Complete
Availability (A): Complete
Additional Information:
Allows unauthorized disclosure of information
Allows unauthorized modification
Allows disruption of service

Vendor Statements (disclaimer)

Official Statement from Red Hat (09/02/2009)

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-2009-1897 The flaw only affects the Red Hat Enterprise Linux 5.4 beta kernel, which includes a backport of the upstream bug fix introducing this flaw (git commit 33dccbb0). This issue did not affect the final released Red Hat Enterprise Linux 5.4 kernel. It is also possible to mitigate this flaw by ensuring that the permissions for /dev/net/tun is restricted to root only. This issue does not affect any other released kernel in any Red Hat product.

References to Advisories, Solutions, and Tools

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Hyperlink Resource
http://archives.neohapsis.com/archives/fulldisclosure/2009-07/0241.html
http://archives.neohapsis.com/archives/fulldisclosure/2009-07/0246.html
http://article.gmane.org/gmane.linux.network/124939
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=3c8a9c63d5fd738c261bd0ceece04d9c8357ca13 Exploit Patch Vendor Advisory
http://grsecurity.net/~spender/cheddar_bay.tgz Patch
http://isc.sans.org/diary.html?storyid=6820 Exploit
http://lkml.org/lkml/2009/7/6/19 Exploit
http://www.openwall.com/lists/oss-security/2009/07/17/1
http://www.vupen.com/english/advisories/2009/1925 Patch Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=512284
https://exchange.xforce.ibmcloud.com/vulnerabilities/51803

Technical Details

Vulnerability Type (View All)

Change History

2 change records found - show changes

Quick Info

CVE Dictionary Entry:
CVE-2009-1897
NVD Published Date:
07/20/2009
NVD Last Modified:
08/16/2017