VDB-130683 · CVE-2019-1676 · BID 106909

Cisco Meeting Server up to 2.3.8 Session Initiation Protocol Messages input validation

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.
6.5	$0-$5k	0.00

A vulnerability, which was classified as problematic, was found in Cisco Meeting Server up to 2.3.8 (Unified Communication Software). This affects an unknown function of the component Session Initiation Protocol. The manipulation as part of a Messages 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 summary by CVE is:

A vulnerability in the Session Initiation Protocol (SIP) call processing of Cisco Meeting Server (CMS) software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition of the Cisco Meeting Server. The vulnerability is due to insufficient validation of Session Description Protocol (SDP) messages. An attacker could exploit this vulnerability by sending a crafted SDP message to the CMS call bridge. An exploit could allow the attacker to cause the CMS to reload, causing a DoS condition for all connected clients. Versions prior to 2.3.9 are affected.

The bug was discovered 02/06/2019. The weakness was presented 02/08/2019 as cisco-sa-20190206-meeting-sipd as confirmed advisory (Website). It is possible to read the advisory at tools.cisco.com. This vulnerability is uniquely identified as CVE-2019-1676 since 12/06/2018. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available.

The vulnerability was handled as a non-public zero-day exploit for at least 2 days. During that time the estimated underground price was around $5k-$25k. The commercial vulnerability scanner Qualys is able to test this issue with plugin 316370 (Cisco Meeting Server SIP Processing Denial of Service Vulnerability(cisco-sa-20190206-meeting-sipdos)).

Upgrading to version 2.3.9 eliminates this vulnerability.

See VDB-130637, VDB-131692, VDB-134336 and VDB-137418 for similar entries.

Productinfo

Type

Unified Communication Software

Vendor

Cisco

Name

Meeting Server

Version

License

commercial

Support

end of life (old version)

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.5
VulDB Meta Temp Score: 6.5

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

NVD Base Score: 7.5
NVD Vector: 🔍

CNA Base Score: 6.8
CNA Vector (Cisco Systems, Inc.): 🔍

CVSSv2info

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Input validation
CWE: 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
Today	unlock	unlock	unlock	unlock

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Meeting Server 2.3.9

Timelineinfo

12/06/2018 🔍
02/06/2019 +62 days 🔍
02/08/2019 +2 days 🔍
02/09/2019 +1 days 🔍
07/09/2023 +1611 days 🔍

Sourcesinfo

Vendor: cisco.com

Advisory: cisco-sa-20190206-meeting-sipd
Status: Confirmed

CVE: CVE-2019-1676 (🔍)
SecurityFocus: 106909

See also: 🔍

Entryinfo

Created: 02/09/2019 10:34 AM
Updated: 07/09/2023 08:32 AM
Changes: 02/09/2019 10:34 AM (63), 05/09/2020 12:39 PM (1), 07/09/2023 08:28 AM (4), 07/09/2023 08:32 AM (12)
Complete: 🔍
Cache ID: 35:28E:40