Out-of-bounds write in WhatsApp

1) Out-of-bounds write

EUVDB-ID: #VU46540

Risk: High

CVSSv4.0: 6.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2020-1894

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. A remote attacker can trick a victim to play a specially crafted push to talk message, trigger out-of-bounds write and execute arbitrary code on the target system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

WhatsApp Messenger for Android: before 2.20.35

WhatsApp Business for Android: before 2.20.20

WhatsApp Messenger for iOS: 2.18.110 - 2.20.22

WhatsApp Business for iPhone: before 2.20.30

CPE2.3

• cpe:2.3:a:whatsapp:whatsapp:*:*:*:*:*:*:*:*
• cpe:2.3:a:whatsapp:whatsapp_business_for_android:*:*:*:*:*:*:*:*
• cpe:2.3:a:whatsapp:whatsapp_for_ios:2.18.110:*:*:*:*:*:*:*
• cpe:2.3:a:whatsapp:whatsapp_for_ios:2.18.111:*:*:*:*:*:*:*
• cpe:2.3:a:whatsapp:whatsapp_for_ios:2.19.10:*:*:*:*:*:*:*
• cpe:2.3:a:whatsapp:whatsapp_business_for_iphone:*:*:*:*:*:*:*:*

External links

https://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.