Insecure DLL loading in Cisco Webex Meetings, Webex Network Recording Player and Webex Teams

1) Insecure DLL loading

EUVDB-ID: #VU53759

Risk: Low

CVSSv3.1: 4.2 [CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-1536

CWE-ID: CWE-427 - Uncontrolled Search Path Element

Exploit availability: No

Description

The vulnerability allows a local user to compromise vulnerable system.

The vulnerability exists due to incorrect handling of directory paths at run time. A local user can place a specially crafted .dll file and execute arbitrary code on victim's system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Cisco Webex Meetings Client for Windows: before 41.2.9.23

Cisco WebEx Meetings Server: before 4.0 MR4

Cisco WebEx Network Recording Player: before 41.2.9.23

Cisco Webex Teams: before 41.5.0.18815

External links

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webex-dll-inject-XNmcSGTU

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.