PT-2021-4688 · Cisco · Cisco Webex Meetings Server+3

Xavier Danest · Published 2021-06-02 · Updated 2021-06-11 · CVE-2021-1536

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Cisco Webex Meetings Desktop App for Windows (affected versions not specified) Cisco Webex Meetings Server (affected versions not specified) Cisco Webex Network Recording Player for Windows (affected versions not specified) Cisco Webex Teams for Windows (affected versions not specified)

Description A vulnerability in the mentioned Cisco Webex products could allow an authenticated, local attacker to perform a DLL injection attack on an affected device. The attacker must have valid credentials on the Windows system to exploit this vulnerability, which is due to incorrect handling of directory paths at run time. An attacker could exploit this vulnerability by inserting a configuration file in a specific path in the system, causing a malicious DLL file to be loaded when the application starts. A successful exploit could allow the attacker to execute arbitrary code on the affected system with the privileges of another user account.

Recommendations For Cisco Webex Meetings Desktop App for Windows, consider disabling the application until a patch is available to prevent potential DLL injection attacks. For Cisco Webex Meetings Server, restrict access to the server to minimize the risk of exploitation. For Cisco Webex Network Recording Player for Windows, avoid using the application until the issue is resolved. For Cisco Webex Teams for Windows, consider disabling the dll loading functionality as a temporary workaround until a patch is available. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Uncontrolled Search Path Element

Weakness Enumeration

CWE-427

Related Identifiers

BDU:2021-05385

CVE-2021-1536

Affected Products

Cisco Webex Meetings Desktop App For Windows

Cisco Webex Meetings Server

Cisco Webex Network Recording Player For Windows

Cisco Webex Teams For Windows

References · 7

• https://osv.dev/vulnerability/CVE-2021-1536 · Vendor Advisory
• https://bdu.fstec.ru/vul/2021-05385 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2021-1536 · Security Note
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webex-dll-inject-XNmcSGTU · Vendor Advisory
• https://t.me/cvenotify/15595 · Telegram Post
• https://t.me/cvenotify/15596 · Telegram Post
• https://cybersecurity-help.cz/vdb/SB2021060308 · Note