Common Weakness Enumeration

CWE-322

Allowed

Key Exchange without Entity Authentication

Abstraction: Base · Status: Draft

API response cwe.mitre.org

The product performs a key exchange with an actor without verifying the identity of that actor.

33 vulnerabilities reference this CWE, most recent first.

CVE-2022-39248 (GCVE-0-2022-39248)

Vulnerability from cvelistv5 – Published: 2022-09-28 20:05 – Updated: 2025-04-23 16:54
VLAI
Title
matrix-android-sdk2 vulnerable to Olm/Megolm protocol confusion
Summary
matrix-android-sdk2 is the Matrix SDK for Android. Prior to version 1.5.1, 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. matrix-android-sdk2 would then additionally sign such a key backup with its device key, spilling trust over to other devices trusting the matrix-android-sdk2 device. These attacks are possible due to a protocol confusion vulnerability that accepts to-device messages encrypted with Megolm instead of Olm. matrix-android-sdk2 version 1.5.1 has been modified to only accept Olm-encrypted to-device messages and to stop signing backups on a successful decryption. 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.
Severity
8.6 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-04-23 15:50 UTC
CWE
  • CWE-322 - Key Exchange without Entity Authentication
  • CWE-287 - Improper Authentication
Assigner
GitHub_M CNA
References
Impacted products
Show details on NVD website
To clipboard 

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CVE-2022-39246 (GCVE-0-2022-39246)

Vulnerability from cvelistv5 – Published: 2022-09-28 20:00 – Updated: 2025-04-23 16:54
VLAI
Title
matrix-android-sdk2 vulnerable to impersonation via forwarded Megolm sessions
Summary
matrix-android-sdk2 is the Matrix SDK for Android. Prior to version 1.5.1, an attacker cooperating with a malicious homeserver can construct messages appearing to have come from another person. Such messages will be marked with a grey shield on some platforms, but this may be missing in others. This attack is possible due to the key forwarding strategy implemented in the matrix-android-sdk2 that is too permissive. Starting with version 1.5.1, the default policy for accepting key forwards has been made more strict in the matrix-android-sdk2. The matrix-android-sdk2 will now only accept forwarded keys in response to previously issued requests and only from own, verified devices. The SDK now sets a `trusted` flag on the decrypted message upon decryption, based on whether the key used to decrypt the message was received from a trusted source. Clients need to ensure that messages decrypted with a key with `trusted = false` are decorated appropriately (for example, by showing a warning for such messages). As a workaroubnd, current users of the SDK can disable key forwarding in their forks using `CryptoService#enableKeyGossiping(enable: Boolean)`.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-04-23 15:50 UTC
CWE
  • CWE-322 - Key Exchange without Entity Authentication
  • CWE-287 - Improper Authentication
Assigner
GitHub_M CNA
References
Impacted products
Show details on NVD website
To clipboard 

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CVE-2021-34433 (GCVE-0-2021-34433)

Vulnerability from cvelistv5 – Published: 2021-08-20 17:10 – Updated: 2024-08-04 00:12
VLAI
Summary
In Eclipse Californium version 2.0.0 to 2.6.4 and 3.0.0-M1 to 3.0.0-M3, the certificate based (x509 and RPK) DTLS handshakes accidentally succeeds without verifying the server side's signature on the client side, if that signature is not included in the server's ServerKeyExchange.
Severity
No CVSS data available.
CWE
  • CWE-322 - Key Exchange without Entity Authentication
Assigner
eclipse CNA
References
Impacted products
Vendor Product Version
The Eclipse Foundation Eclipse Californium Affected: 2.0.0 , < unspecified (custom)
Affected: unspecified , ≤ 2.6.4 (custom)
Affected: 3.0.0-M1 , < unspecified (custom)
Affected: unspecified , ≤ 3.0.0-M3 (custom)
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Mitigation
Architecture and Design

Ensure that proper authentication is included in the system design.

Mitigation
Implementation

Understand and properly implement all checks necessary to ensure the identity of entities involved in encrypted communications.

No CAPEC attack patterns related to this CWE.

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