Insecure DLL loading in Cisco Webex Teams Client for Windows

1) Insecure DLL loading

EUVDB-ID: #VU47434

Risk: Low

CVSSv3.1: 6.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-3535

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 in the loading mechanism of specific DLLs. A local user can place a specially crafted .dll file and execute arbitrary code with the privileges of another user’s account.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Cisco Webex Teams: 3.0.13464.0 - 3.0.16040.0

External links

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webex-teams-dll-drsnH5AN

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.

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to visit a specially crafted website or open a file.

The attacker would have to login to the system and perform certain actions in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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