Out-of-bounds write in WhatsApp

1) Out-of-bounds write

EUVDB-ID: #VU46539

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-1891

CWE-ID: CWE-787 - Out-of-bounds write

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a boundary error when processing untrusted input within a user controlled parameter used in video call. A remote attacker can trigger out-of-bounds write and execute arbitrary code on the target system on 32-bit devices.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

WhatsApp Messenger for Android: before 2.20.17

WhatsApp Business for Android: before 2.20.7

WhatsApp Messenger for iOS: 2.18.110 - 2.20.11

WhatsApp Business for iPhone: before 2.20.20

External links

http://www.whatsapp.com/security/advisories/2020

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 perform certain actions on the device.

Is there known malware, which exploits this vulnerability?

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