Digium Asterisk pjsip Session Object memory corruption

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
5.4$0-$5k0.00

Summaryinfo

A vulnerability classified as problematic was found in Digium Asterisk. Affected by this issue is some unknown functionality of the component pjsip Session Object Handler. The manipulation results in memory corruption. This vulnerability is reported as CVE-2017-16672. The attack can be launched remotely. No exploit exists. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as problematic has been found in Digium Asterisk (Communications System) (version unknown). Affected is an unknown function of the component pjsip Session Object Handler. The manipulation with an unknown input leads to a memory corruption vulnerability. CWE is classifying the issue as 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. This is going to have an impact on availability. CVE summarizes:

An issue was discovered in Asterisk Open Source 13 before 13.18.1, 14 before 14.7.1, and 15 before 15.1.1 and Certified Asterisk 13.13 before 13.13-cert7. A memory leak occurs when an Asterisk pjsip session object is created and that call gets rejected before the session itself is fully established. When this happens the session object never gets destroyed. Eventually Asterisk can run out of memory and crash.

The bug was discovered 10/15/2017. The weakness was disclosed 11/09/2017 (Website). The advisory is available at downloads.digium.com. This vulnerability is traded as CVE-2017-16672 since 11/08/2017. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. The technical details are unknown and an exploit is not available.

The vulnerability was handled as a non-public zero-day exploit for at least 24 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 104658 (Asterisk 13.x < 13.18.1 / 14.x < 14.7.1 / 15.x < 15.1.1 / 13.13 < 13.13-cert7 Multiple Vulnerabilities (AST-2017-009 - AST-2017-011)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Misc. and running in the context r. The commercial vulnerability scanner Qualys is able to test this issue with plugin 176261 (Debian Security Update for asterisk (DSA 4076-1)).

Upgrading eliminates this vulnerability. A possible mitigation has been published before and not just after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (104658) and SecurityFocus (BID 101765†). The entries VDB-109241, VDB-110152 and VDB-110667 are pretty similar. If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

Vendor

Name

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.6
VulDB Meta Temp Score: 5.5

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

NVD Base Score: 5.9
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

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: 🔍

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Nessus ID: 104658
Nessus Name: Asterisk 13.x < 13.18.1 / 14.x < 14.7.1 / 15.x < 15.1.1 / 13.13 < 13.13-cert7 Multiple Vulnerabilities (AST-2017-009 - AST-2017-011)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 864857
OpenVAS Name: Asterisk Memory Leak Vulnerability
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Timelineinfo

10/15/2017 🔍
11/08/2017 +24 days 🔍
11/08/2017 +0 days 🔍
11/08/2017 +0 days 🔍
11/09/2017 +1 days 🔍
11/09/2017 +0 days 🔍
11/09/2017 +0 days 🔍
11/17/2017 +8 days 🔍
12/17/2019 +760 days 🔍

Sourcesinfo

Vendor: digium.com

Advisory: downloads.digium.com
Status: Not defined
Confirmation: 🔍

CVE: CVE-2017-16672 (🔍)
GCVE (CVE): GCVE-0-2017-16672
GCVE (VulDB): GCVE-100-109242

OVAL: 🔍

SecurityFocus: 101765 - Multiple Asterisk Products Information Disclosure Vulnerability

See also: 🔍

Entryinfo

Created: 11/09/2017 08:16
Updated: 12/17/2019 16:09
Changes: 11/09/2017 08:16 (73), 12/17/2019 16:09 (6)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Do you need the next level of professionalism?

Upgrade your account now!