Digium Asterisk up to 13.18.4/14.7.4/15.1.4 PJSIP Channel Driver Contact Header input validation
CVSS Meta Temp Score | Current Exploit Price (≈) | CTI Interest Score |
---|---|---|
6.1 | $0-$5k | 0.00 |
A vulnerability, which was classified as problematic, was found in Digium Asterisk up to 13.18.4/14.7.4/15.1.4 (Communications System). Affected is an unknown code block of the component PJSIP Channel Driver Contact Header Handler. The manipulation with an unknown input leads to a input validation vulnerability. CWE is classifying the issue as 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. This is going to have an impact on availability.
The bug was discovered 12/12/2017. The weakness was presented 12/22/2017 as AST-2017-014 as confirmed advisory (Website). The advisory is available at downloads.digium.com. This vulnerability is traded as CVE-2017-17850 since 12/22/2017. The exploitability is told to be easy. 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 10 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 105448 (FreeBSD : asterisk -- Crash in PJSIP resource when missing a contact header (2a3bc6ac-e7c6-11e7-a90b-001999f8d30b)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family FreeBSD Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 371284 (Asterisk's Crash in PJSIP Vulnerability (AST-2017-014)).
Upgrading to version 13.18.5, 14.7.5 or 15.1.5 eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability.
The vulnerability is also documented in the vulnerability database at Tenable (105448).
Product
Type
Vendor
Name
Version
License
CPE 2.3
CPE 2.2
CVSSv4
VulDB CVSS-B Score: 🔍VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍
CVSSv3
VulDB Meta Base Score: 6.4VulDB Meta Temp Score: 6.3
VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍
NVD Base Score: 7.5
NVD Vector: 🔍
CVSSv2
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Vector | Complexity | Authentication | Confidentiality | Integrity | Availability |
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unlock | unlock | unlock | unlock | unlock | unlock |
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍
NVD Base Score: 🔍
Exploiting
Class: Input validationCWE: CWE-20
CAPEC: 🔍
ATT&CK: 🔍
Local: No
Remote: Yes
Availability: 🔍
Status: Not defined
EPSS Score: 🔍
EPSS Percentile: 🔍
Price Prediction: 🔍
Current Price Estimation: 🔍
0-Day | unlock | unlock | unlock | unlock |
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Today | unlock | unlock | unlock | unlock |
Nessus ID: 105448
Nessus Name: FreeBSD : asterisk -- Crash in PJSIP resource when missing a contact header (2a3bc6ac-e7c6-11e7-a90b-001999f8d30b)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍
OpenVAS ID: 100334
OpenVAS Name: Fedora Update for asterisk FEDORA-2017-41242dfe10
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 13.18.5/14.7.5/15.1.5
Timeline
12/12/2017 🔍12/22/2017 🔍
12/22/2017 🔍
12/22/2017 🔍
12/23/2017 🔍
12/24/2017 🔍
12/26/2017 🔍
12/27/2017 🔍
01/28/2021 🔍
Sources
Vendor: digium.comAdvisory: AST-2017-014
Status: Confirmed
Confirmation: 🔍
CVE: CVE-2017-17850 (🔍)
SecurityTracker: 1040056
Entry
Created: 12/24/2017 09:31Updated: 01/28/2021 07:42
Changes: 12/24/2017 09:31 (77), 12/17/2019 16:01 (3), 01/28/2021 07:42 (3)
Complete: 🔍
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