Digium Asterisk up to 11.1.1 AMI main/http.c ast_http_get_post_vars Content-Length memory corruption
| CVSS Meta Temp Score | Current Exploit Price (≈) | CTI Interest Score |
|---|---|---|
| 5.9 | $0-$5k | 0.00 |
A vulnerability classified as critical was found in Digium Asterisk up to 11.1.1 (Communications System). This vulnerability affects the function ast_http_get_post_vars of the file main/http.c of the component AMI. The manipulation of the argument Content-Length with an unknown input leads to a memory corruption vulnerability. The CWE definition for the vulnerability is CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. As an impact it is known to affect availability. CVE summarizes:
Multiple stack consumption vulnerabilities in Asterisk Open Source 1.8.x before 1.8.19.1, 10.x before 10.11.1, and 11.x before 11.1.2; Certified Asterisk 1.8.11 before 1.8.11-cert10; and Asterisk Digiumphones 10.x-digiumphones before 10.11.1-digiumphones allow remote attackers to cause a denial of service (daemon crash) via TCP data using the (1) SIP, (2) HTTP, or (3) XMPP protocol.
The weakness was released 01/02/2013 by Walter Doekes and Brandon Edwards with Exodus Intelligence as AST-2012-014 as confirmed advisory (Website). The advisory is available at downloads.digium.com. The public release was coordinated with the vendor. This vulnerability was named CVE-2012-5976 since 11/21/2012. The attack can be initiated remotely. The successful exploitation needs a single authentication. Technical details and also a public exploit are known.
It is declared as proof-of-concept. The vulnerability scanner Nessus provides a plugin with the ID 72054 (GLSA-201401-15 : Asterisk: Multiple vulnerabilities), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Gentoo Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 42397 (Asterisk Multiple Denial of Service Vulnerabilities (AST-2012-014, AST-2012-015)).
Upgrading to version 1.8.19.1, 10.11.1 or 11.1.1 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at downloads.asterisk.org. The best possible mitigation is suggested to be upgrading to the latest version. A possible mitigation has been published immediately after the disclosure of the vulnerability. Furthermore it is possible to detect and prevent this kind of attack with TippingPoint and the filter 25474.
The vulnerability is also documented in the databases at X-Force (80921) and Tenable (72054). Entries connected to this vulnerability are available at 7231 and 7232.
Product
Type
Vendor
Name
Version
License
CPE 2.3
CPE 2.2
CVSSv4
VulDB CVSS-B Score: 🔍VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
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CVSSv3
VulDB Meta Base Score: 6.5VulDB Meta Temp Score: 5.9
VulDB Base Score: 6.5
VulDB Temp Score: 5.9
VulDB Vector: 🔍
VulDB Reliability: 🔍
CVSSv2
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VulDB Base Score: 🔍
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Exploiting
Class: Memory corruptionCWE: CWE-119
CAPEC: 🔍
ATT&CK: 🔍
Local: No
Remote: Yes
Availability: 🔍
Access: Public
Status: Proof-of-Concept
EPSS Score: 🔍
EPSS Percentile: 🔍
Price Prediction: 🔍
Current Price Estimation: 🔍
| 0-Day | unlock | unlock | unlock | unlock |
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Nessus ID: 72054
Nessus Name: GLSA-201401-15 : Asterisk: Multiple vulnerabilities
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Port: 🔍
OpenVAS ID: 892605
OpenVAS Name: Debian Security Advisory DSA 2605-2 (asterisk - several issues
OpenVAS File: 🔍
OpenVAS Family: 🔍
Qualys ID: 🔍
Qualys Name: 🔍
Threat Intelligence
Interest: 🔍Active Actors: 🔍
Active APT Groups: 🔍
Countermeasures
Recommended: UpgradeStatus: 🔍
Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍
Upgrade: Asterisk 1.8.19.1/10.11.1/11.1.1
Patch: downloads.asterisk.org
TippingPoint: 🔍
McAfee IPS: 🔍
McAfee IPS Version: 🔍
ISS Proventia IPS: 🔍
PaloAlto IPS: 🔍
Fortigate IPS: 🔍
Timeline
11/21/2012 🔍01/02/2013 🔍
01/02/2013 🔍
01/02/2013 🔍
01/02/2013 🔍
01/02/2013 🔍
01/03/2013 🔍
01/04/2013 🔍
01/08/2013 🔍
01/09/2013 🔍
01/21/2014 🔍
07/20/2017 🔍
Sources
Vendor: digium.comAdvisory: AST-2012-014
Researcher: Walter Doekes, Brandon Edwards
Organization: Exodus Intelligence
Status: Confirmed
Confirmation: 🔍
Coordinated: 🔍
CVE: CVE-2012-5976 (🔍)
OVAL: 🔍
X-Force: 80921
SecurityTracker: 1027931 - Asterisk Stack Allocation Overflow Lets Remote Users Deny Service
Vulnerability Center: 37920 - Multiple Digium Products Stack Consumption Vulnerabilities Allow Remote DoS via TCP Data, Medium
SecurityFocus: 57106 - Multiple Asterisk Products CVE-2012-5976 Stack Overflow Denial of Service Vulnerability
Secunia: 51689 - Asterisk Multiple Vulnerabilities, Highly Critical
OSVDB: 88876
scip Labs: https://www.scip.ch/en/?labs.20161013
See also: 🔍
Entry
Created: 01/09/2013 09:30Updated: 07/20/2017 15:16
Changes: 01/09/2013 09:30 (96), 07/20/2017 15:16 (9)
Complete: 🔍
Committer: olku
Cache ID: 3:C70:103
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