Digium Asterisk up to 1.8.15.0/10.7.0 IAX2 Channel Driver channels/chan_iax2.c access control

CVSS Meta Temp Score
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CTI Interest Score
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4.2$0-$5k0.00

Summaryinfo

A vulnerability was found in Digium Asterisk up to 1.8.15.0/10.7.0 and classified as critical. This affects an unknown function of the file channels/chan_iax2.c of the component IAX2 Channel Driver. Such manipulation leads to access control. This vulnerability is referenced as CVE-2012-4737. The attack needs to be initiated within the local network. Furthermore, an exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Digium Asterisk up to 1.8.15.0/10.7.0 (Communications System) and classified as critical. Affected by this issue is an unknown code of the file channels/chan_iax2.c of the component IAX2 Channel Driver. The manipulation with an unknown input leads to a access control vulnerability. Using CWE to declare the problem leads to CWE-264. Impacted is confidentiality, and integrity. CVE summarizes:

channels/chan_iax2.c in Asterisk Open Source 1.8.x before 1.8.15.1 and 10.x before 10.7.1, Certified Asterisk 1.8.11 before 1.8.11-cert7, Asterisk Digiumphones 10.x.x-digiumphones before 10.7.1-digiumphones, and Asterisk Business Edition C.3.x before C.3.7.6 does not enforce ACL rules during certain uses of peer credentials, which allows remote authenticated users to bypass intended outbound-call restrictions by leveraging the availability of these credentials.

The weakness was published 08/30/2012 by Alan Frisch as AST-2012-013 as confirmed advisory (Website). The advisory is shared for download at downloads.asterisk.org. The public release has been coordinated with the vendor. This vulnerability is handled as CVE-2012-4737 since 08/30/2012. The attack needs to be initiated within the local network. A simple authentication is needed for exploitation. Technical details as well as a private exploit are known. The MITRE ATT&CK project declares the attack technique as T1068.

It is declared as proof-of-concept. The vulnerability was handled as a non-public zero-day exploit for at least 34 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 61994 (Asterisk Peer IAX2 Call Handling ACL Rule Bypass (AST-2012-013)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Misc..

Upgrading to version 1.8.15.1 or 10.7.1 eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (61994), SecurityFocus (BID 55335†), OSVDB (85069†), Secunia (SA50456†) and SecurityTracker (ID 1027461†). Similar entry is available at VDB-6081. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.6
VulDB Meta Temp Score: 4.2

VulDB Base Score: 4.6
VulDB Temp Score: 4.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

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Exploitinginfo

Class: Access control
CWE: CWE-264
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Private
Status: Proof-of-Concept

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 61994
Nessus Name: Asterisk Peer IAX2 Call Handling ACL Rule Bypass (AST-2012-013)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍

OpenVAS ID: 72408
OpenVAS Name: Debian Security Advisory DSA 2550-1 (asterisk)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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

Upgrade: Asterisk 1.8.15.1/10.7.1

Timelineinfo

07/27/2012 🔍
08/30/2012 +34 days 🔍
08/30/2012 +0 days 🔍
08/30/2012 +0 days 🔍
08/30/2012 +0 days 🔍
08/31/2012 +1 days 🔍
08/31/2012 +0 days 🔍
08/31/2012 +0 days 🔍
08/31/2012 +0 days 🔍
08/31/2012 +0 days 🔍
09/03/2012 +3 days 🔍
09/06/2012 +3 days 🔍
09/11/2012 +5 days 🔍
04/12/2021 +3135 days 🔍

Sourcesinfo

Vendor: digium.com

Advisory: AST-2012-013
Researcher: Alan Frisch
Status: Confirmed
Confirmation: 🔍
Coordinated: 🔍

CVE: CVE-2012-4737 (🔍)
GCVE (CVE): GCVE-0-2012-4737
GCVE (VulDB): GCVE-100-6080

OVAL: 🔍

SecurityFocus: 55335 - Asterisk CVE-2012-4737 Access Rule Remote Security Bypass Vulnerability
Secunia: 50456 - Asterisk Two Vulnerabilities, Moderately Critical
OSVDB: 85069
SecurityTracker: 1027461 - Asterisk Lets Remote Authenticated Users Bypass Access Controls
Vulnerability Center: 36108 - Asterisk Multiple Products channels/chan_iax2.c Remote Outbound-Call Restrictions Bypass, Medium

scip Labs: https://www.scip.ch/en/?labs.20161013
See also: 🔍

Entryinfo

Created: 09/03/2012 12:49
Updated: 04/12/2021 06:13
Changes: 09/03/2012 12:49 (81), 12/24/2017 09:34 (12), 04/12/2021 06:13 (3)
Complete: 🔍
Cache ID: 216::103

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