Vulnerability identifier: #VU72323

Vulnerability risk: Medium

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

CVE-ID: CVE-2021-0341

CWE-ID: CWE-295

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Google Android
Operating systems & Components / Operating system

Vendor:

Description

The vulnerability allows a remote attacker to perform MitM attack.

the vulnerability exists due to improper certificate validation within the verifyHostName in OkHostnameVerifier.java in okhttp library in Android runtime. A remote attacker can force the system to accept a certificate for the wrong domain due to improperly used crypto and perform MitM attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

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External links
http://source.android.com/security/bulletin/2021-02-01
http://android.googlesource.com/platform/external/okhttp/+/ddc934efe3ed06ce34f3724d41cfbdcd7e7358fc
http://android.googlesource.com/platform/libcore/+/4076be9a99bad5ff7651540df976c57462c3b8ce
http://bugzilla.redhat.com/show_bug.cgi?id=2154086

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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.