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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2021-29430 Detail

Description

Sydent is a reference Matrix identity server. Sydent does not limit the size of requests it receives from HTTP clients. A malicious user could send an HTTP request with a very large body, leading to memory exhaustion and denial of service. Sydent also does not limit response size for requests it makes to remote Matrix homeservers. A malicious homeserver could return a very large response, again leading to memory exhaustion and denial of service. This affects any server which accepts registration requests from untrusted clients. This issue has been patched by releases 89071a1, 0523511, f56eee3. As a workaround request sizes can be limited in an HTTP reverse-proxy. There are no known workarounds for the problem with overlarge responses.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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Hyperlink Resource
https://github.com/matrix-org/sydent/commit/0523511d2fb40f2738f8a8549868f44b96e5dab7 Patch  Third Party Advisory 
https://github.com/matrix-org/sydent/commit/0523511d2fb40f2738f8a8549868f44b96e5dab7 Patch  Third Party Advisory 
https://github.com/matrix-org/sydent/commit/89071a1a754c69a50deac89e6bb74002d4cda19d Patch  Third Party Advisory 
https://github.com/matrix-org/sydent/commit/89071a1a754c69a50deac89e6bb74002d4cda19d Patch  Third Party Advisory 
https://github.com/matrix-org/sydent/commit/f56eee315b6c44fdd9f6aa785cc2ec744a594428 Patch  Third Party Advisory 
https://github.com/matrix-org/sydent/commit/f56eee315b6c44fdd9f6aa785cc2ec744a594428 Patch  Third Party Advisory 
https://github.com/matrix-org/sydent/releases/tag/v2.3.0 Release Notes  Third Party Advisory 
https://github.com/matrix-org/sydent/releases/tag/v2.3.0 Release Notes  Third Party Advisory 
https://github.com/matrix-org/sydent/security/advisories/GHSA-wmg4-8cp2-hpg9 Patch  Third Party Advisory 
https://github.com/matrix-org/sydent/security/advisories/GHSA-wmg4-8cp2-hpg9 Patch  Third Party Advisory 
https://pypi.org/project/matrix-sydent/ Product  Third Party Advisory 
https://pypi.org/project/matrix-sydent/ Product  Third Party Advisory 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-770 Allocation of Resources Without Limits or Throttling cwe source acceptance level NIST  
CWE-400 Uncontrolled Resource Consumption GitHub, Inc.  
CWE-20 Improper Input Validation GitHub, Inc.  

Known Affected Software Configurations Switch to CPE 2.2

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Change History

4 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2021-29430
NVD Published Date:
04/15/2021
NVD Last Modified:
11/21/2024
Source:
GitHub, Inc.