VDB-133795 · CVE-2019-1721 · BID 108016

Cisco Expressway/TelePresence Video Communication Server Phone Book resource management

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.1$0-$5k0.00

Summaryinfo

A vulnerability marked as problematic has been reported in Cisco Expressway and TelePresence Video Communication Server up to X12.5.0. This affects an unknown part of the component Phone Book. This manipulation as part of SIP Message causes resource management. This vulnerability is registered as CVE-2019-1721. Remote exploitation of the attack is possible. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in Cisco Expressway and TelePresence Video Communication Server up to X12.5.0 (Unified Communication Software). Affected by this vulnerability is an unknown code of the component Phone Book. The manipulation as part of a SIP Message leads to a resource management vulnerability. The CWE definition for the vulnerability is CWE-399. As an impact it is known to affect availability. The summary by CVE is:

A vulnerability in the phone book feature of Cisco Expressway Series and Cisco TelePresence Video Communication Server (VCS) could allow an authenticated, remote attacker to cause the CPU to increase to 100% utilization, causing a denial of service (DoS) condition on an affected system. The vulnerability is due to improper handling of the XML input. An attacker could exploit this vulnerability by sending a Session Initiation Protocol (SIP) message with a crafted XML payload to an affected device. A successful exploit could allow the attacker to exhaust CPU resources, resulting in a DoS condition. Manual intervention may be required to recover the device. This vulnerability is fixed in Cisco Expressway Series and Cisco TelePresence Video Communication Server Releases X12.5.1 and later.

The bug was discovered 04/17/2019. The weakness was published 04/18/2019 as cisco-sa-20190417-es-tvcs-dos as confirmed advisory (Website). It is possible to read the advisory at tools.cisco.com. This vulnerability is known as CVE-2019-1721 since 12/06/2018. The attack can be launched remotely. A single 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 1 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 38765 (Cisco Expressway Series and Cisco TelePresence Video Communication Server Denial of Service Vulnerability(cisco-sa-20190417-es-tvcs-dos)).

Upgrading to version X12.5.1 eliminates this vulnerability.

Similar entries are available at VDB-133796 and VDB-133794. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.2
VulDB Meta Temp Score: 6.1

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.5
NVD Vector: 🔍

CNA Base Score: 7.7
CNA Vector (Cisco Systems, Inc.): 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Resource management
CWE: CWE-399 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Expressway/TelePresence Video Communication Server X12.5.1

Timelineinfo

12/06/2018 🔍
04/17/2019 +132 days 🔍
04/18/2019 +1 days 🔍
04/18/2019 +0 days 🔍
09/04/2023 +1600 days 🔍

Sourcesinfo

Vendor: cisco.com

Advisory: cisco-sa-20190417-es-tvcs-dos
Status: Confirmed

CVE: CVE-2019-1721 (🔍)
GCVE (CVE): GCVE-0-2019-1721
GCVE (VulDB): GCVE-100-133795
SecurityFocus: 108016

See also: 🔍

Entryinfo

Created: 04/18/2019 20:16
Updated: 09/04/2023 13:20
Changes: 04/18/2019 20:16 (63), 05/30/2020 15:30 (2), 09/04/2023 13:15 (4), 09/04/2023 13:20 (12)
Complete: 🔍
Cache ID: 216::103

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