| Vulnerability Name: | CVE-2022-39250 (CCN-237522) | ||||||||||||||||||
| Published: | 2022-09-28 | ||||||||||||||||||
| Updated: | 2022-12-03 | ||||||||||||||||||
| Summary: | Matrix JavaScript SDK is the Matrix Client-Server software development kit (SDK) for JavaScript. Prior to version 19.7.0, an attacker cooperating with a malicious homeserver could interfere with the verification flow between two users, injecting its own cross-signing user identity in place of one of the users’ identities. This would lead to the other device trusting/verifying the user identity under the control of the homeserver instead of the intended one. The vulnerability is a bug in the matrix-js-sdk, caused by checking and signing user identities and devices in two separate steps, and inadequately fixing the keys to be signed between those steps. Even though the attack is partly made possible due to the design decision of treating cross-signing user identities as Matrix devices on the server side (with their device ID set to the public part of the user identity key), no other examined implementations were vulnerable. Starting with version 19.7.0, the matrix-js-sdk has been modified to double check that the key signed is the one that was verified instead of just referencing the key by ID. An additional check has been made to report an error when one of the device ID matches a cross-signing key. As this attack requires coordination between a malicious homeserver and an attacker, those who trust their homeservers do not need a particular workaround. | ||||||||||||||||||
| CVSS v3 Severity: | 8.6 High (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N) 7.5 High (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N/E:U/RL:O/RC:C)
7.5 High (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N/E:U/RL:O/RC:C)
6.5 Medium (REDHAT Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C)
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| CVSS v2 Severity: | 7.8 High (CCN CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:C/A:N)
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| Vulnerability Type: | CWE-322) | ||||||||||||||||||
| Vulnerability Consequences: | Bypass Security | ||||||||||||||||||
| References: | Source: MITRE Type: CNA CVE-2022-39250 Source: XF Type: UNKNOWN matrix-cve202239250-sec-bypass(237522) Source: security-advisories@github.com Type: Patch, Third Party Advisory security-advisories@github.com Source: security-advisories@github.com Type: Release Notes, Third Party Advisory security-advisories@github.com Source: CCN Type: matrix-js-sdk GIT Repository Key/device identifier confusion in SAS verification Source: security-advisories@github.com Type: Third Party Advisory security-advisories@github.com Source: CCN Type: Matrix Blog, 2022-09-28 Upgrade now to address E2EE vulnerabilities in matrix-js-sdk, matrix-ios-sdk and matrix-android-sdk2 Source: security-advisories@github.com Type: Vendor Advisory security-advisories@github.com Source: security-advisories@github.com Type: Third Party Advisory security-advisories@github.com Source: CCN Type: SNYK-JS-MATRIXJSSDK-3035643 Key Exchange without Entity Authentication Source: CCN Type: Mozilla Foundation Security Advisory 2022-43 Security Vulnerabilities fixed in Thunderbird 102.3.1 | ||||||||||||||||||
| Vulnerable Configuration: | Configuration RedHat 1: Denotes that component is vulnerable | ||||||||||||||||||
| Oval Definitions | |||||||||||||||||||
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