MIT Kerberos up to 5-1.13.1 appl/user_user/server.c recvauth_common 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 was found in MIT Kerberos up to 5-1.13.1 and classified as problematic. This affects the function recvauth_common of the file appl/user_user/server.c. The manipulation results in null pointer dereference. This vulnerability is reported as CVE-2014-5355. No exploit exists. Applying a patch is advised to resolve this issue.

Detailsinfo

A vulnerability classified as problematic has been found in MIT Kerberos up to 5-1.13.1 (Network Authentication Software). Affected is the function recvauth_common of the file appl/user_user/server.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 weakness was disclosed 12/09/2014 as confirmed git commit (GIT Repository). The advisory is shared for download at github.com. This vulnerability is traded as CVE-2014-5355 since 08/19/2014. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available. The reason for this vulnerability is this part of code: 

if (retval) {

The vulnerability scanner Nessus provides a plugin with the ID 83874 (AIX NAS Advisory : nas_advisory3.asc), which helps to determine the existence of the flaw in a target environment. It is assigned to the family AIX Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 350184 (Amazon Linux Security Advisory for krb5: ALAS-2015-518).

Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. A possible mitigation has been published immediately after the disclosure of the vulnerability. The vulnerability will be addressed with the following lines of code:

if (retval || pname_data.length == 0 ||
   pname_data.data[pname_data.length - 1] != '\0') {
Furthermore it is possible to detect and prevent this kind of attack with TippingPoint and the filter 19684.

The vulnerability is also documented in the databases at X-Force (100972), Tenable (83874), SecurityFocus (BID 74042†), SecurityTracker (ID 1031767†) and Vulnerability Center (SBV-49735†). The entries VDB-69037, VDB-69038, VDB-69040 and VDB-69039 are pretty similar. VulDB is the best source for vulnerability data and more expert information about this specific topic.

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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

AVACAuCIA
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
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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: 83874
Nessus Name: AIX NAS Advisory : nas_advisory3.asc
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 14611
OpenVAS Name: Amazon Linux Local Check: alas-2015-624
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: 🔍

Patch: github.com
TippingPoint: 🔍

McAfee IPS: 🔍
McAfee IPS Version: 🔍

Fortigate IPS: 🔍

Timelineinfo

08/19/2014 🔍
12/09/2014 +112 days 🔍
12/09/2014 +0 days 🔍
02/15/2015 +68 days 🔍
02/18/2015 +2 days 🔍
02/19/2015 +1 days 🔍
02/20/2015 +1 days 🔍
03/31/2015 +38 days 🔍
04/16/2015 +16 days 🔍
05/28/2015 +42 days 🔍
03/10/2022 +2478 days 🔍

Sourcesinfo

Vendor: mit.edu

Advisory: USN-2810-1
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2014-5355 (🔍)
GCVE (CVE): GCVE-0-2014-5355
GCVE (VulDB): GCVE-100-69192

OVAL: 🔍

X-Force: 100972 - MIT Kerberos krb5_recvauth denial of service, Medium Risk
SecurityFocus: 74042 - MIT Kerberos 5 CVE-2014-5355 Multiple Denial of Service Vulnerabilities
SecurityTracker: 1031767
Vulnerability Center: 49735 - MIT Kerberos 5 through 1.13.1 Remote DoS via a Zero-Byte Version String or by Omitting the \x27\\0\x27 Character, Medium

See also: 🔍

Entryinfo

Created: 02/19/2015 10:21
Updated: 03/10/2022 14:45
Changes: 02/19/2015 10:21 (81), 09/24/2018 08:57 (10), 03/10/2022 14:38 (4), 03/10/2022 14:42 (1), 03/10/2022 14:45 (1)
Complete: 🔍
Cache ID: 216:694:103

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