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Last updated: 11/29/2014 2:35:20 AM

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Vulnerability Workload Index: 8.14
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National Cyber Awareness System

Vulnerability Summary for CVE-2009-1897

Original release date: 07/20/2009
Last revised: 03/19/2012
Source: US-CERT/NIST

Overview

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.

Impact

CVSS Severity (version 2.0):
CVSS v2 Base Score: 6.9 (MEDIUM) (AV:L/AC:M/Au:N/C:C/I:C/A:C) (legend)
Impact Subscore: 10.0
Exploitability Subscore: 3.4
CVSS Version 2 Metrics:
Access Vector: Locally exploitable
Access Complexity: Medium
Authentication: Not required to exploit
Impact Type: 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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External Source: FULLDISC
Name: 20090716 Linux 2.6.30+/SELinux/RHEL5 test kernel 0day, exploiting the unexploitable
External Source: CONFIRM
Name: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=3c8a9c63d5fd738c261bd0ceece04d9c8357ca13
Type: Advisory; Patch Information; Exploit
External Source: VUPEN
Name: ADV-2009-1925
Type: Advisory; Patch Information
External Source: MISC
Name: http://grsecurity.net/~spender/cheddar_bay.tgz
Type: Patch Information
External Source: FULLDISC
Name: 20090716 Re: Linux 2.6.30+/SELinux/RHEL5 test kernel 0day, exploiting the unexploitable
External Source: XF
Name: linux-kernel-tunchrpoll-code-execution(51803)
External Source: MLIST
Name: [linux-kernel] 20090706 Re: PROBLEM: tun/tap crashes if open() /dev/net/tun and then poll() it.
External Source: MLIST
Name: [oss-security] 20090717 Linux 2.6.30+/SELinux/RHEL5 test kernel 0day, exploiting the unexploitable
External Source: MLIST
Name: [netdev] 20090409 Oops in tun: bisected to Limit amount of queued packets per device
External Source: MISC
Name: http://isc.sans.org/diary.html?storyid=6820
External Source: CONFIRM
Name: https://bugzilla.redhat.com/show_bug.cgi?id=512284
External Source: SECUNIA
Name: 35839
Type: Advisory

Technical Details

Vulnerability Type (View All)