CVE - CVE-2021-29430

CVE-ID
CVE-2021-29430	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
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.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
CONFIRM:https://github.com/matrix-org/sydent/security/advisories/GHSA-wmg4-8cp2-hpg9 URL:https://github.com/matrix-org/sydent/security/advisories/GHSA-wmg4-8cp2-hpg9 MISC:https://github.com/matrix-org/sydent/commit/0523511d2fb40f2738f8a8549868f44b96e5dab7 URL:https://github.com/matrix-org/sydent/commit/0523511d2fb40f2738f8a8549868f44b96e5dab7 MISC:https://github.com/matrix-org/sydent/commit/89071a1a754c69a50deac89e6bb74002d4cda19d URL:https://github.com/matrix-org/sydent/commit/89071a1a754c69a50deac89e6bb74002d4cda19d MISC:https://github.com/matrix-org/sydent/commit/f56eee315b6c44fdd9f6aa785cc2ec744a594428 URL:https://github.com/matrix-org/sydent/commit/f56eee315b6c44fdd9f6aa785cc2ec744a594428 MISC:https://github.com/matrix-org/sydent/releases/tag/v2.3.0 URL:https://github.com/matrix-org/sydent/releases/tag/v2.3.0 MISC:https://pypi.org/project/matrix-sydent/ URL:https://pypi.org/project/matrix-sydent/
Assigning CNA
GitHub (maintainer security advisories)
Date Record Created
20210330	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20210330)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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