SRC-2018-0034 : Cisco Webex Meetings Desktop App Update Service DLL Planting Elevation of Privilege Vulnerability

CVE ID:

CVE-2018-15442

CVSS Score:

7.8, (AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H)

Affected Vendors:

Cisco

Affected Products:

Webex Meetings Desktop App

Vulnerability Details:

This vulnerability allows local attackers to escalate privileges on vulnerable installations of Webex Meetings Desktop App. An attacker must first obtain the ability to execute low-privileged code on the target system or have valid credentials in order to exploit this vulnerability.

The specific flaw exists when parsing user supplied paths to the update service. The issue results from the lack of validating the supplied path prior to executing signed binaries. An attacker can leverage this vulnerability to execute code in the context of SYSTEM.

Vendor Response:

Cisco has issued an update to correct these vulnerabilities. More details can be found at:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20181024-webex-injection

Disclosure Timeline:

• 2018-10-30 - Vulnerability reported to iDefense
• 2018-11-01 - Verified and acquired by iDefense
• 2018-11-27 - Coordinated public release of advisory

Credit:

This vulnerability was discovered by Steven Seeley (mr_me) of Source Incite

Acknowledgments:

Source Incite would like to acknowledge iDefense's Vulnerability Contributor Program for the help with co-ordination of this vulnerability.