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CRITICAL CISCO UNIFIED COMMUNICATIONS RCE BUG ALLOWS ROOT ACCESSCRITICAL CISCO
UNIFIED COMMUNICATIONS RCE BUG ALLOWS ROOT ACCESS

The vulnerability, tracked as CVE-2024-20253, makes enterprise communications
infrastructure and customer service call centers sitting ducks for
unauthenticated cyberattackers.

Tara Seals, Managing Editor, News, Dark Reading

January 25, 2024

1 Min Read
Source: Anucha Cheechang via Shutterstock


A critical security vulnerability in Cisco Unified Communications and Contact
Center Solutions (UC/CC) could allow unauthenticated remote code execution
(RCE).

The bug (CVE-2024-20253, 9.9 CVSS) arises thanks to "improper processing of
user-provided data that is being read into memory," according to Cisco's
advisory, issued yesterday.

Remote attackers who are not logged onto the system can simply send specially
crafted messages to a vulnerable device's listening port in order to achieve
RCE; from there, they can execute code on the underlying operating system with
the privileges of the Web services user, and/or gain root access.



Cisco's UC/CC platforms are used by small and midsized businesses (SMBs) and
enterprises to provide communications over IP, including voice calling, video
calls, mobile integration, chat and messaging, app integrations, and more. As
such, device compromise could have a number of bad outcomes, including: locking
up an organization's communications infrastructure with ransomware and
disrupting customer service interactions; allowing cyberattackers to infiltrate
IP phones and other endpoints hooked into the system; eavesdropping on
communications; data exfiltration; recon for follow-on phishing attacks; and
more.



Cisco's advisory offers a list of affected versions and corresponding patches.
For those unable to immediately update, the networking giant also detailed a
mitigation path. This involves establishing access control lists (ACLs) on
intermediary devices that separate the UC/CC cluster from the rest of the
network, "to allow access only to the ports of deployed services."





ABOUT THE AUTHOR(S)

Tara Seals, Managing Editor, News, Dark Reading



Tara Seals has 20+ years of experience as a journalist, analyst and editor in
the cybersecurity, communications and technology space. Prior to Dark Reading,
Tara was Editor in Chief at Threatpost, and prior to that, the North American
news lead for Infosecurity Magazine. She also spent 13 years working for Informa
(formerly Virgo Publishing), as executive editor and editor-in-chief at
publications focused on both the service provider and the enterprise arenas. A
Texas native, she holds a B.A. from Columbia University, lives in Western
Massachusetts with her family and is on a never-ending quest for good Mexican
food in the Northeast.


See more from Tara Seals, Managing Editor, News, Dark Reading
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