Vulnerability identifier: #VU35918

Vulnerability risk: Medium

CVSSv3.1: 5.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-3566

CWE-ID: CWE-200

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
WhatsApp Messenger for Android
Mobile applications / Apps for mobile phones

Vendor: WhatsApp

Description

The vulnerability allows a remote non-authenticated attacker to gain access to sensitive information.

A bug in WhatsApp for Android's messaging logic would potentially allow a malicious individual who has taken over over a WhatsApp user's account to recover previously sent messages. This behavior requires independent knowledge of metadata for previous messages, which are not available publicly. This issue affects WhatsApp for Android 2.19.52 and 2.19.54 - 2.19.103, as well as WhatsApp Business for Android starting in v2.19.22 until v2.19.38.

Mitigation
Install update from vendor's website.

Vulnerable software versions

WhatsApp Messenger for Android: 2.19.52

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External links
http://www.facebook.com/security/advisories/cve-2019-3566

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Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

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