Digium Asterisk 1.x ast_uri_encode memory corruption

CVSS Meta Temp Score
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CTI Interest Score
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6.2$0-$5k0.00

Summaryinfo

A vulnerability described as problematic has been identified in Digium Asterisk 1.x. Impacted is the function ast_uri_encode. Executing a manipulation can lead to memory corruption. This vulnerability is registered as CVE-2011-0495. It is possible to launch the attack remotely. No exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as critical was found in Digium Asterisk 1.x (Communications System). This vulnerability affects the function ast_uri_encode. The manipulation 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:

Stack-based buffer overflow in the ast_uri_encode function in main/utils.c in Asterisk Open Source before 1.4.38.1, 1.4.39.1, 1.6.1.21, 1.6.2.15.1, 1.6.2.16.1, 1.8.1.2, 1.8.2.; and Business Edition before C.3.6.2; when running in pedantic mode allows remote authenticated users to execute arbitrary code via crafted caller ID data in vectors involving the (1) SIP channel driver, (2) URIENCODE dialplan function, or (3) AGI dialplan function.

The weakness was published 01/19/2011 with Asterisk (Website). The advisory is shared for download at downloads.asterisk.org. This vulnerability was named CVE-2011-0495. The attack can be initiated remotely. The requirement for exploitation is a single authentication. There are known technical details, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 52055 (Debian DSA-2171-1 : asterisk - buffer overflow), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Debian Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 118933 (Asterisk SIP Channel Driver Stack Buffer Overflow Vulnerability(AST-2011-001)).

Upgrading 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 2 days after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (52055), SecurityFocus (BID 45839†), OSVDB (70518†), Secunia (SA42935†) and Vulnerability Center (SBV-29340†). 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: 6.5
VulDB Meta Temp Score: 6.2

VulDB Base Score: 6.5
VulDB Temp Score: 6.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

Class: Memory corruption
CWE: CWE-119
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: 52055
Nessus Name: Debian DSA-2171-1 : asterisk - buffer overflow
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Port: 🔍

OpenVAS ID: 69105
OpenVAS Name: Debian Security Advisory DSA 2171-1 (asterisk)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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

Patch: downloads.asterisk.org

Timelineinfo

01/18/2011 🔍
01/19/2011 +0 days 🔍
01/19/2011 +0 days 🔍
01/19/2011 +0 days 🔍
01/19/2011 +0 days 🔍
01/20/2011 +1 days 🔍
01/20/2011 +0 days 🔍
01/20/2011 +0 days 🔍
01/20/2011 +0 days 🔍
01/24/2011 +3 days 🔍
02/22/2011 +29 days 🔍
01/19/2025 +5080 days 🔍

Sourcesinfo

Vendor: digium.com

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

CVE: CVE-2011-0495 (🔍)
GCVE (CVE): GCVE-0-2011-0495
GCVE (VulDB): GCVE-100-4240

OVAL: 🔍

X-Force: 64831
SecurityFocus: 45839 - Asterisk SIP Channel Driver Stack Buffer Overflow Vulnerability
Secunia: 42935 - Asterisk "ast_uri_encode()" Buffer Overflow Vulnerability, Moderately Critical
OSVDB: 70518 - Asterisk main/utils.c ast_uri_encode() Function Caller ID Information Overflow
Vulnerability Center: 29340 - Asterisk Open Source and Business Edition Remote Arbitrary Code Execution Vulnerability, Medium

Entryinfo

Created: 01/19/2011 01:00
Updated: 01/19/2025 02:13
Changes: 01/19/2011 01:00 (75), 12/24/2017 09:34 (12), 03/18/2021 16:03 (5), 03/18/2021 16:09 (1), 01/19/2025 02:13 (18)
Complete: 🔍
Cache ID: 216::103

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