Linux Kernel up to 2.6.33.20 nf_conntrack_reasm.c nf_ct_frag6_reasm null pointer dereference

CVSS Meta Temp Score
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CTI Interest Score
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7.2$0-$5k0.00

Summaryinfo

A vulnerability classified as problematic has been found in Linux Kernel. Affected by this issue is the function nf_ct_frag6_reasm of the file net/ipv6/netfilter/nf_conntrack_reasm.c. Performing a manipulation results in null pointer dereference. This vulnerability is known as CVE-2012-2744. No exploit is available. It is recommended to apply a patch to fix this issue.

Detailsinfo

A vulnerability, which was classified as critical, was found in Linux Kernel (Operating System). This affects the function nf_ct_frag6_reasm of the file net/ipv6/netfilter/nf_conntrack_reasm.c. The manipulation with an unknown input leads to a null pointer dereference vulnerability. CWE is classifying the issue as CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. This is going to have an impact on availability. The summary by CVE is:

net/ipv6/netfilter/nf_conntrack_reasm.c in the Linux kernel before 2.6.34, when the nf_conntrack_ipv6 module is enabled, allows remote attackers to cause a denial of service (NULL pointer dereference and system crash) via certain types of fragmented IPv6 packets.

The issue has been introduced in 02/24/2010. The weakness was published 07/10/2012 with Beyond Security's SecuriTeam Secure Disclosure as RHSA-2012:1064-2 as confirmed advisory (Red Hat Security Advisory). It is possible to read the advisory at rhn.redhat.com. This vulnerability is uniquely identified as CVE-2012-2744 since 05/14/2012. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability was handled as a non-public zero-day exploit for at least 867 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 68575 (Oracle Linux 6 : kernel (ELSA-2012-1064)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Oracle Linux Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 165420 (SUSE Enterprise Linux Security Update for Linux Kernel (SUSE-SU-2012:1391-1)).

Applying a patch is able to eliminate this problem. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (68575), SecurityFocus (BID 54367†), OSVDB (83665†), Secunia (SA49778†) and SecurityTracker (ID 1027235†). Similar entries are available at VDB-5656, VDB-56544, VDB-56540 and VDB-60945. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 7.2

VulDB Base Score: 7.5
VulDB Temp Score: 7.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
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NVD Base Score: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 68575
Nessus Name: Oracle Linux 6 : kernel (ELSA-2012-1064)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Port: 🔍

OpenVAS ID: 881073
OpenVAS Name: CentOS Update for kernel CESA-2012:1064 centos6
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍
ISS Proventia IPS: 🔍
Fortigate IPS: 🔍

Timelineinfo

02/24/2010 🔍
05/14/2012 +810 days 🔍
07/10/2012 +57 days 🔍
07/10/2012 +0 days 🔍
07/10/2012 +0 days 🔍
07/10/2012 +0 days 🔍
07/10/2012 +0 days 🔍
07/10/2012 +0 days 🔍
07/11/2012 +1 days 🔍
07/19/2012 +8 days 🔍
08/09/2012 +21 days 🔍
07/12/2013 +337 days 🔍
03/26/2021 +2814 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: RHSA-2012:1064-2
Organization: Beyond Security's SecuriTeam Secure Disclosure
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2012-2744 (🔍)
GCVE (CVE): GCVE-0-2012-2744
GCVE (VulDB): GCVE-100-5655

OVAL: 🔍

SecurityFocus: 54367
Secunia: 49778 - Red Hat update for kernel, Moderately Critical
OSVDB: 83665
SecurityTracker: 1027235 - Linux Kernel IPv6 Netfilter Connection Tracking Flaw Lets Remote Users Deny Service
Vulnerability Center: 35533 - Linux Kernel Netfilter IPv6 Null Pointer Dereference Error Allows Remote DoS, High

See also: 🔍

Entryinfo

Created: 07/19/2012 15:45
Updated: 03/26/2021 09:33
Changes: 07/19/2012 15:45 (76), 04/14/2017 14:11 (14), 03/26/2021 09:33 (3)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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