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9.4	$0-$5k	0.00

A vulnerability classified as very critical was found in MIT Kerberos up to 5-1.9 (Network Authentication Software). Affected by this vulnerability is the function prepare_error_as of the file do_as_req.c of the component Key Distribution Center. The manipulation with an unknown input leads to a resource management vulnerability. The CWE definition for the vulnerability is CWE-399. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Double free vulnerability in the prepare_error_as function in do_as_req.c in the Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) 1.7 through 1.9, when the PKINIT feature is enabled, allows remote attackers to cause a denial of service (daemon crash) or possibly execute arbitrary code via an e_data field containing typed data.

The weakness was released 03/15/2011 with Red Hat as confirmed advisory (CERT.org). The advisory is shared at kb.cert.org. This vulnerability is known as CVE-2011-0284 since 01/03/2011. The exploitation appears to be difficult. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/19/2021).

It is declared as proof-of-concept. The vulnerability scanner Nessus provides a plugin with the ID 68230 (Oracle Linux 6 : krb5 (ELSA-2011-0356)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Oracle Linux Local Security Checks.

A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (66101) and Tenable (68230).

Productinfo

Type

• Network Authentication Software

Vendor

• MIT

Name

• Kerberos

Version

• 5-1.7
• 5-1.7.1
• 5-1.8
• 5-1.8.1
• 5-1.8.2
• 5-1.8.3
• 5-1.9

License

• open-source

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 10.0
VulDB Meta Temp Score: 9.4

VulDB Base Score: 10.0
VulDB Temp Score: 9.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
unlock	unlock	unlock	unlock	unlock	unlock
unlock	unlock	unlock	unlock	unlock	unlock
unlock	unlock	unlock	unlock	unlock	unlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Resource management
CWE: CWE-399 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Local: No
Remote: Yes

Availability: 🔍
Status: Proof-of-Concept

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	unlock	unlock	unlock	unlock
Today	unlock	unlock	unlock	unlock

Nessus ID: 68230
Nessus Name: Oracle Linux 6 : krb5 (ELSA-2011-0356)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Port: 🔍

OpenVAS ID: 69596
OpenVAS Name: FreeBSD Ports: krb5
OpenVAS File: 🔍
OpenVAS Family: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Timelineinfo

01/03/2011 🔍
03/15/2011 +71 days 🔍
03/15/2011 +0 days 🔍
03/15/2011 +0 days 🔍
03/15/2011 +0 days 🔍
03/15/2011 +0 days 🔍
03/16/2011 +0 days 🔍
03/16/2011 +0 days 🔍
03/19/2011 +2 days 🔍
03/20/2011 +1 days 🔍
07/12/2013 +845 days 🔍
03/20/2015 +616 days 🔍
10/19/2021 +2405 days 🔍

Sourcesinfo

Vendor: mit.edu

Advisory: RHSA-2011:0356
Organization: Red Hat
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2011-0284 (🔍)
OVAL: 🔍

X-Force: 66101
SecurityTracker: 1025216 - MIT Kerberos KDC Double Free in perpare_error_as() Lets Remote Users Execute Arbitrary Code
Vulnerability Center: 30598 - MIT Kerberos 5 1.7-1.9 Key Distribution Center Remote Double Free Vulnerability, Medium
SecurityFocus: 46881 - MIT Kerberos KDC 'do_as_req.c' Double Free Memory Corruption Vulnerability
Secunia: 43783 - Kerberos KDC "prepare_error_as" Double-Free Vulnerability, Highly Critical
OSVDB: 71183 - Kerberos KDC src/kdc/do_as_req.c prepare_error_as() Function AS-REQ Request Double-free Arbitrary Code Execution
Vupen: ADV-2011-0672

Entryinfo

Created: 03/20/2015 16:16
Updated: 10/19/2021 22:48
Changes: 03/20/2015 16:16 (69), 03/19/2017 13:34 (19), 10/19/2021 22:20 (3), 10/19/2021 22:34 (1), 10/19/2021 22:48 (2)
Complete: 🔍

Discussion

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