Loading HuntDB...
Hunt
Vulnerability Intelligence by wss.sh
Home Daily Briefings High Impact CVEs Recent Exploits KEV Catalog GitHub Advisories Latest Updates Security News
Sign In Sign Up

CVE-2021-29431

HIGH
Published 2021-04-15T21:00:16
Actions:

Expert Analysis

Professional remediation guidance

Get tailored security recommendations from our analyst team for CVE-2021-29431. We'll provide specific mitigation strategies based on your environment and risk profile.

CVSS Score

V3.1
7.7
/10
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Base Score Metrics
Exploitability: N/A Impact: N/A

EPSS Score

v2025.03.14
0.003
probability
of exploitation in the wild

There is a 0.3% chance that this vulnerability will be exploited in the wild within the next 30 days.

Updated: 2025-06-25
Exploit Probability
Percentile: 0.530
Higher than 53.0% of all CVEs

Attack Vector Metrics

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED

Impact Metrics

Confidentiality
HIGH
Integrity
NONE
Availability
NONE

Description

Sydent is a reference Matrix identity server. Sydent can be induced to send HTTP GET requests to internal systems, due to lack of parameter validation or IP address blacklisting. It is not possible to exfiltrate data or control request headers, but it might be possible to use the attack to perform an internal port enumeration. This issue has been addressed in in 9e57334, 8936925, 3d531ed, 0f00412. A potential workaround would be to use a firewall to ensure that Sydent cannot reach internal HTTP resources.

Available Exploits

No exploits available for this CVE.

Related News

No news articles found for this CVE.

Affected Products

matrix-org

sydent

Affected Versions:

< 2.3.0

GitHub Security Advisories

Community-driven vulnerability intelligence from GitHub

✓ GitHub Reviewed MODERATE

SSRF in Sydent due to missing validation of hostnames

GHSA-9jhm-8m8c-c3f4

Advisory Details

### Impact Sydent can be induced to send HTTP GET requests to internal systems, due to lack of parameter validation or IP address blacklisting. It is not possible to exfiltrate data or control request headers, but it might be possible to use the attack to perform an internal port enumeration. ### Patches Fixed in 9e57334, 8936925, 3d531ed, 0f00412 ### Workarounds A potential workaround would be to use a firewall to ensure that Sydent cannot reach internal HTTP resources. ### For more information If you have any questions or comments about this advisory, email us at [email protected].

Affected Packages

PyPI matrix-sydent
ECOSYSTEM: ≥0 <2.3.0

CVSS Scoring

CVSS Score

5.0

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

References

WEB https://github.com/matrix-org/sydent/security/advisories/GHSA-9jhm-8m8c-c3f4
ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2021-29431
WEB https://github.com/matrix-org/sydent/commit/0f00412017f25619bc36c264b29ea96808bf310a
WEB https://github.com/matrix-org/sydent/commit/3d531ed50d2fd41ac387f36d44d3fb2c62dd22d3
WEB https://github.com/matrix-org/sydent/commit/8936925f561b0c352c2fa922d5097d7245aad00a
WEB https://github.com/matrix-org/sydent/commit/9e573348d81df8191bbe8c266c01999c9d57cd5f
PACKAGE https://github.com/matrix-org/sydent
WEB https://github.com/matrix-org/sydent/releases/tag/v2.3.0
WEB https://github.com/pypa/advisory-database/tree/main/vulns/matrix-sydent/PYSEC-2021-22.yaml
WEB https://pypi.org/project/matrix-sydent

Advisory provided by GitHub Security Advisory Database. Published: April 19, 2021, Modified: September 30, 2024

References

https://pypi.org/project/matrix-sydent/
https://github.com/matrix-org/sydent/releases/tag/v2.3.0
https://github.com/matrix-org/sydent/security/advisories/GHSA-9jhm-8m8c-c3f4
https://github.com/matrix-org/sydent/commit/9e573348d81df8191bbe8c266c01999c9d57cd5f
https://github.com/matrix-org/sydent/commit/8936925f561b0c352c2fa922d5097d7245aad00a
https://github.com/matrix-org/sydent/commit/3d531ed50d2fd41ac387f36d44d3fb2c62dd22d3
https://github.com/matrix-org/sydent/commit/0f00412017f25619bc36c264b29ea96808bf310a
Published: 2021-04-15T21:00:16
Last Modified: 2024-08-03T22:02:51.856Z
Copied to clipboard!