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Asterisk CVE-2016-7551

HIGH
Resource Management Errors (CWE-399)
2017-04-17 cve@mitre.org
Denial Of Service Debian Debian Linux Asterisk Certified Asterisk Digium
7.5
CVSS 3.0 · NVD
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Vulnerability Assessment

Weakness
CWE
CWE-399
Impact

CVSS score of 7.5 (HIGH). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required. EPSS exploitation probability: 6.63%.
Exploit ScenarioDerived

This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the high-severity affected system.
This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).
Patch available 6.6% exploitation probability (EPSS)

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AnalysisAI

chain_sip in Asterisk Open Source 11.x before 11.23.1 and 13.x 13.11.1 and Certified Asterisk 11.6 before 11.6-cert15 and 13.8 before 13.8-cert3 allows remote attackers to cause a denial of service. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

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Technical ContextAI · show details

This vulnerability is classified under CWE-399. chain_sip in Asterisk Open Source 11.x before 11.23.1 and 13.x 13.11.1 and Certified Asterisk 11.6 before 11.6-cert15 and 13.8 before 13.8-cert3 allows remote attackers to cause a denial of service (port exhaustion). Affected products include: Digium Asterisk, Digium Certified Asterisk, Debian Debian Linux. Version information: before 11.23.1.

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Severity by source

NVD PRIMARY 7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

DescriptionCVE.org

chain_sip in Asterisk Open Source 11.x before 11.23.1 and 13.x 13.11.1 and Certified Asterisk 11.6 before 11.6-cert15 and 13.8 before 13.8-cert3 allows remote attackers to cause a denial of service (port exhaustion).

Threat Intelligence Overview

EPSS Score
6.6%
Top 9% exploitable
Data Quality
3 sources
Confidence: Low
NVD CVE.org EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity HIGH
CISA KEV No
Public POC No
EPSS 6.6%
Patch available Yes
Active threat No
Deciding rule
HIGH severity (CVSS 7.0-8.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
None
System Exposure· derived
Open
Automatable· derived
Yes
Human Impact· derived
Medium

Priority Score

45
Low Medium High Critical
KEV: 0
EPSS: +7
CVSS: +38
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Denial of Service MEDIUM

Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.

Affected Products (CPE)CVE.org

cpe:2.3:a:digium:asterisk:11.0.0:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:11.0.0:beta1:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:11.0.0:beta2:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:11.0.0:rc1:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:11.0.0:rc2:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:11.0.1:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:11.0.2:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:11.1.0:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:11.1.0:rc1:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:11.1.0:rc3:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:11.1.1:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:11.1.2:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:11.2.0:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:11.2.0:rc1:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:11.2.0:rc2:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:11.2.1:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:11.2.2:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:11.3.0:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:11.4.0:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:11.5.0:*:*:*:*:*:*:*
+ 93 more

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Same weakness CWE-399 – Resource Management Errors

View all
CVE-2013-3893 HIGH POC
8.8
CVE-2013-0025 CRITICAL POC
9.3
CVE-2015-0064 CRITICAL POC
9.3
CVE-2015-0065 CRITICAL POC
9.3
CVE-2013-3846 CRITICAL POC
9.3
CVE-2016-5427 HIGH
7.5
CVE-2013-0233 MEDIUM POC
6.8
CVE-2013-1305 HIGH
7.8

Same technique Denial Of Service

View all
CVE-2015-5119 CRITICAL POC
9.8
CVE-2011-2462 CRITICAL POC
9.8
CVE-2011-0611 HIGH POC
8.8
CVE-2012-1889 HIGH POC
8.8
CVE-2012-0507 CRITICAL POC
9.8
CVE-2014-1761 HIGH POC
7.8
CVE-2015-5122 CRITICAL POC
9.8
CVE-2011-0609 HIGH POC
7.8

References

Advisories & patches
PATCH https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=838832 PATCH https://bugzilla.redhat.com/show_bug.cgi?id=1374733 PATCH https://issues.asterisk.org/jira/browse/ASTERISK-26272 ADVISORY http://downloads.asterisk.org/pub/security/AST-2016-007.html REF http://www.debian.org/security/2016/dsa-3700

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