MIT Kerberos up to 5-1.12.1 SPNEGO Acceptor acc_ctx_cont null pointer dereference

CVSS Meta Temp Score
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CTI Interest Score
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4.6$0-$5k0.00

Summaryinfo

A vulnerability marked as problematic has been reported in MIT Kerberos. Affected by this vulnerability is the function acc_ctx_cont of the component SPNEGO Acceptor. This manipulation causes null pointer dereference. The identification of this vulnerability is CVE-2014-4344. There is no exploit available. Applying a patch is the recommended action to fix this issue.

Detailsinfo

A vulnerability was found in MIT Kerberos (Network Authentication Software). It has been declared as problematic. Affected by this vulnerability is the function acc_ctx_cont of the component SPNEGO Acceptor. The manipulation with an unknown input leads to a null pointer dereference vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect availability.

The weakness was shared 08/07/2014 as MITKRB5-SA-2014-001 as confirmed advisory (Website). The advisory is shared at web.mit.edu. This vulnerability is known as CVE-2014-4344 since 06/20/2014. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available. Responsible for the vulnerability is the following code: 

if (REMAIN > INT_MAX)

The vulnerability scanner Nessus provides a plugin with the ID 77532 (AIX NAS Advisory : nas_advisory1.asc), which helps to determine the existence of the flaw in a target environment. It is assigned to the family AIX Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 350283 (Amazon Linux Security Advisory for krb5: ALAS-2014-443).

Upgrading to version 5-1.11.6 or 5-1.12.2 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be patching the affected component. The vulnerability will be addressed with the following lines of code:

if (REMAIN == 0 || REMAIN > INT_MAX)
Furthermore it is possible to detect and prevent this kind of attack with TippingPoint and the filter 16564.

The vulnerability is also documented in the databases at X-Force (95210), Tenable (77532), SecurityFocus (BID 69160†), OSVDB (109389†) and Secunia (SA60448†). Additional details are provided at bugs.debian.org. The entries VDB-11106, VDB-11229, VDB-67257 and VDB-67306 are related to this item. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 4.6

VulDB Base Score: 5.3
VulDB Temp Score: 4.6
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: Unproven

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 77532
Nessus Name: AIX NAS Advisory : nas_advisory1.asc
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍

OpenVAS ID: 703000
OpenVAS Name: Debian Security Advisory DSA 3000-1 (krb5 - security update)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Upgrade: Kerberos 5-1.11.6/5-1.12.2
Patch: github.com
TippingPoint: 🔍
Fortigate IPS: 🔍

Timelineinfo

06/20/2014 🔍
07/22/2014 +32 days 🔍
08/07/2014 +16 days 🔍
08/12/2014 +5 days 🔍
08/14/2014 +2 days 🔍
08/14/2014 +0 days 🔍
02/25/2015 +195 days 🔍
02/10/2022 +2542 days 🔍

Sourcesinfo

Vendor: mit.edu

Advisory: MITKRB5-SA-2014-001
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2014-4344 (🔍)
GCVE (CVE): GCVE-0-2014-4344
GCVE (VulDB): GCVE-100-67309

OVAL: 🔍
IAVM: 🔍

X-Force: 95210 - MIT Kerberos 5 SPNEGO acceptor denial of service, Medium Risk
SecurityFocus: 69160
Secunia: 60448
OSVDB: 109389
SecurityTracker: 1030706
Vulnerability Center: 48803 - MIT Kerberos 5 1.5.x through 1.12.x before 1.12.2 Remote DoS via an Empty Continuation Token, High

Misc.: 🔍
See also: 🔍

Entryinfo

Created: 08/12/2014 22:19
Updated: 02/10/2022 09:50
Changes: 08/12/2014 22:19 (85), 06/21/2017 10:54 (3), 02/10/2022 09:47 (4), 02/10/2022 09:50 (1)
Complete: 🔍
Cache ID: 216::103

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