Multiple vulnerabilities in Zoom Client for Meetings



Published: 2020-04-21 | Updated: 2020-06-30
Risk High
Patch available YES
Number of vulnerabilities 2
CVE-ID CVE-2020-11876
CVE-2020-11877
CWE-ID CWE-254
Exploitation vector Network
Public exploit N/A
Vulnerable software
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Zoom Client for Windows
Client/Desktop applications / Office applications

Vendor Zoom Video Communications, Inc.

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Security Features

EUVDB-ID: #VU27053

Risk: High

CVSSv3.1: 7.4 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:U/RC:C]

CVE-ID: CVE-2020-11876

CWE-ID: CWE-254 - Security Features

Exploit availability: No

Description

This vulnerability allows a remote attacker to bypass security rescritions feature.

The vulnerability exists due to the "airhost.exe" uses the SHA-256 hash of 0123425234234fsdfsdr3242 for initialization of an OpenSSL EVP AES-256 CBC context. A remote attacker can gain unauthorized access to the application.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Zoom Client for Windows: 4.6.11 20559.0413


CPE2.3 External links

http://dev.io/posts/zoomzoo/

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

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.

Is there known malware, which exploits this vulnerability?

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

2) Security Features

EUVDB-ID: #VU27054

Risk: High

CVSSv3.1: 9 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:U/RC:C]

CVE-ID: CVE-2020-11877

CWE-ID: CWE-254 - Security Features

Exploit availability: No

Description

This vulnerability allows a remote attacker to bypass security rescritions feature.

The vulnerability exists due to the "airhost.exe" uses 3423423432325249 as the Initialization Vector (IV) for AES-256 CBC encryption. A remote attacker can gain unauthorized access to the application.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Zoom Client for Windows: 4.6.11 20559.0413


CPE2.3 External links

http://dev.io/posts/zoomzoo/

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

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.

Is there known malware, which exploits this vulnerability?

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



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