CVE-2022-39255

Matrix iOS SDK allows developers to build iOS apps compatible with Matrix. Prior to version 0.23.19, an attacker cooperating with a malicious homeserver can construct messages that legitimately appear to have come from another person, without any indication such as a grey shield. Additionally, a sophisticated attacker cooperating with a malicious homeserver could employ this vulnerability to perform a targeted attack in order to send fake to-device messages appearing to originate from another user. This can allow, for example, to inject the key backup secret during a self-verification, to make a targeted device start using a malicious key backup spoofed by the homeserver. These attacks are possible due to a protocol confusion vulnerability that accepts to-device messages encrypted with Megolm instead of Olm. matrix-ios-sdk version 0.23.19 has been modified to only accept Olm-encrypted to-device messages. Out of caution, several other checks have been audited or added. This attack requires coordination between a malicious home server and an attacker, so those who trust their home servers do not need a workaround. To avoid malicious backup attacks, one should not verify one's new logins using emoji/QR verifications methods until patched.
Configurations

Configuration 1 (hide)

cpe:2.3:a:matrix:software_development_kit:*:*:*:*:*:iphone_os:*:*

History

21 Nov 2024, 07:17

Type Values Removed Values Added
New CVE

Information

Published : 2022-09-28 21:15

Updated : 2024-11-21 07:17


NVD link : CVE-2022-39255

Mitre link : CVE-2022-39255

CVE.ORG link : CVE-2022-39255


JSON object : View

Products Affected

matrix

  • software_development_kit
CWE
CWE-287

Improper Authentication

CWE-322

Key Exchange without Entity Authentication