Digium Asterisk up to 1.8.4.2 Channel Driver chan_sip.c information disclosure

CVSS Meta Temp Score
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CTI Interest Score
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5.1$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as problematic, has been found in Digium Asterisk up to 1.8.4.2. The affected element is an unknown function of the file chan_sip.c of the component Channel Driver. This manipulation causes information disclosure. This vulnerability is tracked as CVE-2011-2536. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Digium Asterisk up to 1.8.4.2 (Communications System). It has been declared as problematic. Affected by this vulnerability is an unknown functionality of the file chan_sip.c of the component Channel Driver. The manipulation with an unknown input leads to a information disclosure vulnerability. The CWE definition for the vulnerability is CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. As an impact it is known to affect confidentiality. The summary by CVE is:

chan_sip.c in the SIP channel driver in Asterisk Open Source 1.4.x before 1.4.41.2, 1.6.2.x before 1.6.2.18.2, and 1.8.x before 1.8.4.4, and Asterisk Business Edition C.3.x before C.3.7.3, disregards the alwaysauthreject option and generates different responses for invalid SIP requests depending on whether the user account exists, which allows remote attackers to enumerate account names via a series of requests.

The weakness was disclosed 07/06/2011 (Website). The advisory is shared at downloads.asterisk.org. This vulnerability is known as CVE-2011-2536 since 06/27/2011. 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. MITRE ATT&CK project uses the attack technique T1592 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 56921 (Asterisk Invalid INVITE / REGISTER SIP Request Username Enumeration (AST-2011-011)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Misc..

Upgrading to version 1.8.4.3 eliminates this vulnerability.

The vulnerability is also documented in the databases at X-Force (68282), Tenable (56921), SecurityFocus (BID 47676†), SecurityTracker (ID 1025734†) and Vulnerability Center (SBV-32073†). The entry VDB-57879 is pretty similar. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.1

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Information disclosure
CWE: CWE-200 / CWE-284 / CWE-266
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: 56921
Nessus Name: Asterisk Invalid INVITE / REGISTER SIP Request Username Enumeration (AST-2011-011)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍

OpenVAS ID: 69996
OpenVAS Name: FreeBSD Ports: asterisk14
OpenVAS File: 🔍
OpenVAS Family: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Asterisk 1.8.4.3

Timelineinfo

05/02/2011 🔍
06/27/2011 +56 days 🔍
06/28/2011 +1 days 🔍
06/29/2011 +1 days 🔍
07/03/2011 +4 days 🔍
07/06/2011 +3 days 🔍
07/06/2011 +0 days 🔍
11/22/2011 +139 days 🔍
03/23/2015 +1217 days 🔍
11/14/2021 +2428 days 🔍

Sourcesinfo

Vendor: digium.com

Advisory: downloads.asterisk.org
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2011-2536 (🔍)
GCVE (CVE): GCVE-0-2011-2536
GCVE (VulDB): GCVE-100-57877
X-Force: 68282
SecurityFocus: 47676 - Asterisk SIP INVITE Request User Enumeration Weakness
SecurityTracker: 1025734 - Asterisk Discloses Username Validity to Remote Users
Vulnerability Center: 32073 - Asterisk Remote Information Disclosure Allows Usernames Leakage via SIP Authentication Requests, Medium

See also: 🔍

Entryinfo

Created: 03/23/2015 16:50
Updated: 11/14/2021 08:18
Changes: 03/23/2015 16:50 (63), 03/24/2017 18:42 (14), 11/14/2021 08:18 (3)
Complete: 🔍
Cache ID: 216::103

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