Description
YaCy Search Server through 1.941 contains an XML external entity injection vulnerability in SVG, FreeMind, and OpenSearch parsers that fail to disable external entity resolution. Attackers can publish malicious documents with DOCTYPE declarations containing SYSTEM entities pointing to local files, causing the crawler to exfiltrate file contents into the searchable index.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| yacy | yacy_search_server | ≤ 1.941 | — |
References
- https://github.com/yacy/yacy_search_server/issues/818 issue-tracking
- https://github.com/yacy/yacy_search_server/commit/3c3a307e8b7a0ebbc4d1e6b10898b52e15c0cd44 patch
- https://github.com/yacy/yacy_search_server/blob/Release_1.941/source/net/yacy/document/parser/images/svgParser.java#L72 technical-description
- https://github.com/yacy/yacy_search_server/blob/Release_1.941/source/net/yacy/document/parser/mmParser.java#L66 technical-description
- https://github.com/yacy/yacy_search_server/blob/Release_1.941/source/net/yacy/document/parser/xml/opensearchdescriptionReader.java#L119 technical-description
- https://github.com/yacy/yacy_search_server product
- VulnCheck Advisory: YaCy Search Server through 1.941 XML External Entity Injection via Parsers third-party-advisory