CVE-2021-29430 – matrix-sydent

Package

Manager: pip
Name: matrix-sydent
Vulnerable Version: >=0 <2.3.0

Severity

Level: High

CVSS v3.1: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

EPSS: 0.01367 pctl0.79473

Details

Sydent vulnerable to denial of service attack via memory exhaustion ### Impact 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 disk space 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. ### Patches Patched by 89071a1, 0523511, f56eee3. ### Workarounds Request sizes can be limited in an HTTP reverse-proxy. There are no known workarounds for the problem with overlarge responses. ### For more information If you have any questions or comments about this advisory, email us at security@matrix.org.

Metadata

Created: 2021-04-19T14:54:04Z
Modified: 2024-09-24T15:43:44Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/04/GHSA-wmg4-8cp2-hpg9/GHSA-wmg4-8cp2-hpg9.json
CWE IDs: ["CWE-20", "CWE-400", "CWE-770"]
Alternative ID: GHSA-wmg4-8cp2-hpg9
Finding: F002
Auto approve: 1