CVE-2021-21392
CVSS V2 Medium 4.9
CVSS V3 Medium 6.3
Description
Synapse is a Matrix reference homeserver written in python (pypi package matrix-synapse). Matrix is an ecosystem for open federated Instant Messaging and VoIP. In Synapse before version 1.28.0 requests to user provided domains were not restricted to external IP addresses when transitional IPv6 addresses were used. Outbound requests to federation, identity servers, when calculating the key validity for third-party invite events, sending push notifications, and generating URL previews are affected. This could cause Synapse to make requests to internal infrastructure on dual-stack networks. See referenced GitHub security advisory for details and workarounds.
Overview
- CVE ID
- CVE-2021-21392
- Assigner
- security-advisories@github.com
- Vulnerability Status
- Analyzed
- Published Version
- 2021-04-12T22:15:13
- Last Modified Date
- 2021-11-23T22:36:22
Weakness Enumerations
CPE Configuration (Product)
| CPE | Vulnerable | Operator | Version Start | Version End |
|---|---|---|---|---|
| cpe:2.3:a:matrix:synapse:*:*:*:*:*:*:*:* | 1 | OR | 1.28.0 | |
| cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* | 1 | OR |
CVSS Version 2
- Version
- 2.0
- Vector String
- AV:N/AC:M/Au:S/C:P/I:P/A:N
- Access Vector
- NETWORK
- Access Compatibility
- MEDIUM
- Authentication
- SINGLE
- Confidentiality Impact
- PARTIAL
- Integrity Impact
- PARTIAL
- Availability Impact
- NONE
- Base Score
- 4.9
- Severity
- MEDIUM
- Exploitability Score
- 6.8
- Impact Score
- 4.9
CVSS Version 3
- Version
- 3.1
- Vector String
- CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:H/A:N
- Attack Vector
- NETWORK
- Attack Compatibility
- LOW
- Privileges Required
- LOW
- User Interaction
- REQUIRED
- Scope
- UNCHANGED
- Confidentiality Impact
- LOW
- Availability Impact
- NONE
- Base Score
- 6.3
- Base Severity
- MEDIUM
- Exploitability Score
- 2.1
- Impact Score
- 4.2
References
| Reference URL | Reference Tags |
|---|---|
| https://pypi.org/project/matrix-synapse/ | Product Third Party Advisory |
| https://github.com/matrix-org/synapse/security/advisories/GHSA-5wrh-4jwv-5w78 | Patch Third Party Advisory |
| https://github.com/matrix-org/synapse/pull/9240 | Patch Third Party Advisory |
| https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TNNAJOZNMVMXM6AS7RFFKB4QLUJ4IFEY/ | Mailing List Third Party Advisory |
Sources
| Source Name | Source URL |
|---|---|
| NIST | https://nvd.nist.gov/vuln/detail/CVE-2021-21392 |
| MITRE | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21392 |
History
| Created | Old Value | New Value | Data Type | Notes |
|---|---|---|---|---|
| 2022-05-10 06:45:04 | Added to TrackCVE | |||
| 2022-12-06 01:37:57 | 2021-04-12T22:15Z | 2021-04-12T22:15:13 | CVE Published Date | updated |
| 2022-12-06 01:37:57 | 2021-11-23T22:36:22 | CVE Modified Date | updated | |
| 2022-12-06 01:37:57 | Analyzed | Vulnerability Status | updated |