Digium Asterisk 12.7.0/13.0.0 res_pjsip_refer input validation

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 Digium Asterisk 12.7.0/13.0.0. The affected element is an unknown function of the component res_pjsip_refer Module. The manipulation leads to input validation. This vulnerability is documented as CVE-2014-8416. The attack can be initiated remotely. There is not any exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Digium Asterisk 12.7.0/13.0.0 (Communications System) and classified as problematic. This issue affects an unknown code of the component res_pjsip_refer Module. The manipulation with an unknown input leads to a input validation vulnerability. Using CWE to declare the problem leads to CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. Impacted is availability.

The weakness was released 11/20/2014 by Joshua Colp as AST-2014-016 as confirmed advisory (Website). The advisory is shared at downloads.asterisk.org. The identification of this vulnerability is CVE-2014-8416 since 10/22/2014. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available. The advisory points out:

When handling an INVITE with Replaces message the res_pjsip_refer module incorrectly assumes that it will be operating on a channel that has just been created. If the INVITE with Replaces message is sent in-dialog after a session has been established this assumption will be incorrect. The res_pjsip_refer module will then hang up a channel that is actually owned by another thread. When this other thread attempts to use the just hung up channel it will end up using freed channel which will likely cause a crash.

The vulnerability was handled as a non-public zero-day exploit for at least 3 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 79439 (Asterisk PJSIP Multiple Vulnerabilities (AST-2014-013 / AST-2014-015 / AST-2014-016)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Misc..

Upgrading to version 12.7.1 or 13.0.1 eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability. The advisory contains the following remark:

If REFER support is not required the res_pjsip_refer module can be unloaded to limit exposure otherwise the res_pjsip_refer module has been patched so it will not allow an in-dialog INVITE with Replaces message to be processed.

The vulnerability is also documented in the databases at X-Force (98867), Tenable (79439), SecurityFocus (BID 71224†), SecurityTracker (ID 1031249†) and Vulnerability Center (SBV-47583†). Entries connected to this vulnerability are available at VDB-68258 and VDB-68260. 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: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Input validation
CWE: CWE-20
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: 79439
Nessus Name: Asterisk PJSIP Multiple Vulnerabilities (AST-2014-013 / AST-2014-015 / AST-2014-016)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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

Upgrade: Asterisk 12.7.1/13.0.1

Timelineinfo

10/22/2014 🔍
11/17/2014 +26 days 🔍
11/20/2014 +3 days 🔍
11/20/2014 +0 days 🔍
11/20/2014 +0 days 🔍
11/21/2014 +1 days 🔍
11/21/2014 +0 days 🔍
11/24/2014 +3 days 🔍
11/24/2014 +0 days 🔍
12/14/2014 +20 days 🔍
02/27/2022 +2632 days 🔍

Sourcesinfo

Vendor: digium.com

Advisory: AST-2014-016
Researcher: Joshua Colp
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2014-8416 (🔍)
GCVE (CVE): GCVE-0-2014-8416
GCVE (VulDB): GCVE-100-68261
X-Force: 98867 - Asterisk INVITE denial of service, Medium Risk
SecurityFocus: 71224 - Asterisk 'res_pjsip_refer' Module Denial of Service Vulnerability
SecurityTracker: 1031249 - Asterisk PJSIP Channel Driver Flaw in res_pjsip_refer Module Lets Remote Users Deny Service
Vulnerability Center: 47583 - Asterisk Open Source 12.0 - 12.7.0 and 13.0 \x27res_pjsip_refer\x27 Remote DoS Vulnerability via an In-Dialog INVITE, Medium

See also: 🔍

Entryinfo

Created: 11/24/2014 09:35
Updated: 02/27/2022 08:01
Changes: 11/24/2014 09:35 (80), 12/24/2017 09:37 (1), 02/27/2022 07:55 (3), 02/27/2022 08:01 (1)
Complete: 🔍
Cache ID: 216:E24:103

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