CVE-2021-29430
Summary
| CVE | CVE-2021-29430 |
|---|---|
| State | PUBLIC |
| Assigner | [email protected] |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2021-04-15 21:15:00 UTC |
| Updated | 2022-08-03 10:13:00 UTC |
| 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. |
Risk And Classification
Problem Types: CWE-770
NVD Known Affected Configurations (CPE 2.3)
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| Release Sydent 2.3.0 (2021-04-15) · matrix-org/sydent · GitHub | MISC | github.com | |
| matrix-sydent · PyPI | MISC | pypi.org | |
| Add max size for other HTTP calls. · matrix-org/sydent@f56eee3 · GitHub | MISC | github.com | |
| Limit the size of .well-known lookups. · matrix-org/sydent@0523511 · GitHub | MISC | github.com | |
| Denial of service attack via disk space or memory exhaustion · Advisory · matrix-org/sydent · GitHub | CONFIRM | github.com | |
| Limit maximum request size. · matrix-org/sydent@89071a1 · GitHub | MISC | github.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
Legacy QID Mappings
- 982748 Python (pip) Security Update for matrix-sydent (GHSA-wmg4-8cp2-hpg9)