Digium Asterisk chan_skinny Channel Driver chan_skinny.c Request resource management
CVSS Meta Temp Score | Current Exploit Price (≈) | CTI Interest Score |
---|---|---|
6.3 | $0-$5k | 0.00 |
A vulnerability classified as problematic was found in Digium Asterisk (Communications System) (version unknown). This vulnerability affects an unknown function of the file chan_skinny.c of the component chan_skinny Channel Driver. The manipulation as part of a Request leads to a resource management vulnerability. The CWE definition for the vulnerability is CWE-399. As an impact it is known to affect availability. CVE summarizes:
An issue was discovered in chan_skinny.c in Asterisk Open Source 13.18.2 and older, 14.7.2 and older, and 15.1.2 and older, and Certified Asterisk 13.13-cert7 and older. If the chan_skinny (aka SCCP protocol) channel driver is flooded with certain requests, it can cause the asterisk process to use excessive amounts of virtual memory, eventually causing asterisk to stop processing requests of any kind.
The bug was discovered 11/30/2017. The weakness was disclosed 12/02/2017 by Juan Sacco (Website). The advisory is shared for download at downloads.digium.com. This vulnerability was named CVE-2017-17090 since 12/01/2017. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details and also a public exploit are known.
A public exploit has been developed by Juan Sacco in Python and been published 3 months after the advisory. It is possible to download the exploit at exploit-db.com. It is declared as highly functional. The vulnerability was handled as a non-public zero-day exploit for at least 1 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 104985 (FreeBSD : asterisk -- DOS Vulnerability in Asterisk chan_skinny (e91cf90c-d6dd-11e7-9d10-001999f8d30b)), 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 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 (104985) and Exploit-DB (43992). The entries 109241, 109242 and 110667 are pretty similar.
Product
Type
Vendor
Name
License
CPE 2.3
CPE 2.2
CVSSv4
VulDB CVSS-B Score: 🔍VulDB CVSS-BT Score: 🔍
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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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VulDB Base Score: 🔍
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Exploiting
Class: Resource managementCWE: CWE-399 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍
Local: No
Remote: Yes
Availability: 🔍
Access: Public
Status: Highly functional
Author: Juan Sacco
Programming Language: 🔍
Download: 🔍
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Nessus ID: 104985
Nessus Name: FreeBSD : asterisk -- DOS Vulnerability in Asterisk chan_skinny (e91cf90c-d6dd-11e7-9d10-001999f8d30b)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍
OpenVAS ID: 860182
OpenVAS Name: Asterisk DoS Vulnerability
OpenVAS File: 🔍
OpenVAS Family: 🔍
Qualys ID: 🔍
Qualys Name: 🔍
Exploit-DB: 🔍
Threat Intelligence
Interest: 🔍Active Actors: 🔍
Active APT Groups: 🔍
Countermeasures
Recommended: UpgradeStatus: 🔍
0-Day Time: 🔍
Exploit Delay Time: 🔍
Timeline
11/30/2017 🔍11/30/2017 🔍
12/01/2017 🔍
12/01/2017 🔍
12/01/2017 🔍
12/02/2017 🔍
12/02/2017 🔍
12/04/2017 🔍
02/07/2018 🔍
02/07/2018 🔍
01/16/2023 🔍
Sources
Vendor: digium.comAdvisory: DLA 1225-1
Researcher: Juan Sacco
Status: Confirmed
Confirmation: 🔍
CVE: CVE-2017-17090 (🔍)
OVAL: 🔍
SecurityTracker: 1039948
SecurityFocus: 102023 - Asterisk 'chan_skinny' Remote Denial of Service Vulnerability
scip Labs: https://www.scip.ch/en/?labs.20161013
See also: 🔍
Entry
Created: 12/02/2017 10:01Updated: 01/16/2023 15:50
Changes: 12/02/2017 10:01 (84), 01/03/2020 11:04 (7), 01/25/2021 16:35 (3), 01/16/2023 15:50 (3)
Complete: 🔍
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