GHSA-3x8c-fmpc-5rmq
Suggest an improvement- Source
- https://github.com/advisories/GHSA-3x8c-fmpc-5rmq
- Import Source
- https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2020/10/GHSA-3x8c-fmpc-5rmq/GHSA-3x8c-fmpc-5rmq.json
- JSON Data
- https://api.osv.dev/v1/vulns/GHSA-3x8c-fmpc-5rmq
- Aliases
- Published
- 2020-10-16T16:56:04Z
- Modified
- 2024-09-24T18:06:15.457794Z
- Severity
-
- 6.1 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N CVSS Calculator
- 5.1 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N CVSS Calculator
- Summary
- Cross-site scripting (XSS) vulnerability in the fallback authentication endpoint
- Details
-
Impact
The fallback authentication endpoint served via Synapse was vulnerable to cross-site scripting (XSS) attacks. The impact depends on the configuration of the domain that Synapse is deployed on, but may allow access to cookies and other browser data, CSRF vulnerabilities, and access to other resources served on the same domain or parent domains.
Patches
This is fixed by #8444, which is included in Synapse v1.21.0.
Workarounds
If the homeserver is not configured to use reCAPTCHA, consent (terms of service), or single sign-on then the affected endpoint can be blocked at a reverse proxy:
/_matrix/client/r0/auth/.*/fallback/web/_matrix/client/unstable/auth/.*/fallback/web
- References
-
- https://github.com/matrix-org/synapse/security/advisories/GHSA-3x8c-fmpc-5rmq
- https://nvd.nist.gov/vuln/detail/CVE-2020-26891
- https://github.com/matrix-org/synapse/pull/8444
- https://github.com/matrix-org/synapse
- https://github.com/matrix-org/synapse/releases
- https://github.com/matrix-org/synapse/releases/tag/v1.21.2
- https://github.com/pypa/advisory-database/tree/main/vulns/matrix-synapse/PYSEC-2020-238.yaml
- https://matrix.org/blog/2020/10/15/synapse-1-21-2-released-and-security-advisory
Affected packages
PyPI / matrix-synapse
Package
- Name
- matrix-synapse
- View open source insights on deps.dev
- Purl
- pkg:pypi/matrix-synapse
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0Unknown introduced version / All previous versions are affectedFixed1.21.0
Affected versions
0.*
0.33.5
0.33.5.1
0.33.6rc1
0.33.6
0.33.7rc1
0.33.7rc2
0.33.7
0.33.8rc2
0.33.8
0.33.9
0.34.0rc1
0.34.0rc2
0.34.0
0.34.0.1
0.34.1.1
0.99.0rc1
0.99.0rc2
0.99.0rc3
0.99.0rc4
0.99.0
0.99.1rc1
0.99.1rc2
0.99.1
0.99.1.1
0.99.2rc1
0.99.2
0.99.3rc1
0.99.3
0.99.3.1
0.99.3.2
0.99.4rc1
0.99.4
0.99.5rc1
0.99.5
0.99.5.1
0.99.5.2
1.*
1.0.0rc1
1.0.0rc2
1.0.0rc3
1.0.0
1.1.0rc1
1.1.0rc2
1.1.0
1.2.0rc1
1.2.0rc2
1.2.0
1.2.1
1.3.0rc1
1.3.0
1.3.1
1.4.0rc1
1.4.0rc2
1.4.0
1.4.1rc1
1.4.1
1.5.0rc1
1.5.0rc2
1.5.0
1.5.1
1.6.0rc1
1.6.0rc2
1.6.0
1.6.1
1.7.0rc1
1.7.0rc2
1.7.0
1.7.1
1.7.2
1.7.3
1.8.0rc1
1.8.0
1.9.0.dev1
1.9.0.dev2
1.9.0rc1
1.9.0
1.9.1
1.10.0rc1
1.10.0rc2
1.10.0rc3
1.10.0rc5
1.10.0
1.10.1
1.11.0rc1
1.11.0
1.11.1
1.12.0rc1
1.12.0
1.12.1rc1
1.12.1
1.12.2
1.12.3
1.12.4rc1
1.12.4
1.13.0rc1
1.13.0rc2
1.13.0rc3
1.13.0
1.14.0rc1
1.14.0rc2
1.14.0
1.15.0rc1
1.15.0
1.15.1
1.15.2
1.16.0rc1
1.16.0rc2
1.16.0
1.16.1
1.17.0rc1
1.17.0
1.18.0rc1
1.18.0rc2
1.18.0
1.19.0rc1
1.19.0
1.19.1rc1
1.19.1
1.19.2
1.19.3
1.20.0rc1
1.20.0rc2
1.20.0rc3
1.20.0rc4
1.20.0rc5
1.20.0
1.20.1
1.21.0rc1
1.21.0rc2
1.21.0rc3