Description
Fedify is a TypeScript library for building federated server apps powered by ActivityPub. Prior to versions 1.6.13, 1.7.14, 1.8.15, and 1.9.2, a Regular Expression Denial of Service (ReDoS) vulnerability exists in Fedify's document loader. The HTML parsing regex at packages/fedify/src/runtime/docloader.ts:259 contains nested quantifiers that cause catastrophic backtracking when processing maliciously crafted HTML responses. This issue has been patched in versions 1.6.13, 1.7.14, 1.8.15, and 1.9.2.
CVSS breakdown
CVSS 3.1
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected products
- fedify-dev / fedify< 1.6.13 – < 1.6.13
- fedify-dev / fedify>= 1.7.0, < 1.7.14 – >= 1.7.0, < 1.7.14
- fedify-dev / fedify>= 1.8.0, < 1.8.15 – >= 1.8.0, < 1.8.15
- fedify-dev / fedify>= 1.9.0, < 1.9.2 – >= 1.9.0, < 1.9.2
References
- VENDOR_ADVISORYhttps://github.com/fedify-dev/fedify/security/advisories/GHSA-rchf-xwx2-hm93
- PATCHhttps://github.com/fedify-dev/fedify/commit/2bdcb24d7d6d5886e0214ed504b63a6dc5488779
- PATCHhttps://github.com/fedify-dev/fedify/commit/bf2f0783634efed2663d1b187dc55461ee1f987a
- PATCHhttps://github.com/fedify-dev/fedify/releases/tag/1.6.13
- PATCHhttps://github.com/fedify-dev/fedify/releases/tag/1.7.14
- PATCHhttps://github.com/fedify-dev/fedify/releases/tag/1.8.15
- PATCHhttps://github.com/fedify-dev/fedify/releases/tag/1.9.2