CVE-2020-5227

Summary

Feedgen (python feedgen) before 0.9.0 is susceptible to XML Denial of Service attacks. The feedgen library allows supplying XML as content for some of the available fields. This XML will be parsed and integrated into the existing XML tree. During this process, feedgen is vulnerable to XML Denial of Service Attacks (e.g. XML Bomb). This becomes a concern in particular if feedgen is used to include content from untrused sources and if XML (including XHTML) is directly included instead of providing plain tex content only. This problem has been fixed in feedgen 0.9.0 which disallows XML entity expansion and external resources.

Affected Software

Weaknesses

• CWE-776: CWE-776: Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion')

ADP Enrichment

CVE Program Container

Additional References

• https://github.com/lkiesow/python-feedgen/security/advisories/GHSA-g8q7-xv52-hf9f
• https://docs.microsoft.com/en-us/archive/msdn-magazine/2009/november/xml-denial-of-service-attacks-and-defenses
• https://github.com/lkiesow/python-feedgen/commit/f57a01b20fa4aaaeccfa417f28e66b4084b9d0cf
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/T6I5ENUYGFNMIH6ZQ62FZ6VU2WD3SIOI/

References

• https://github.com/lkiesow/python-feedgen/security/advisories/GHSA-g8q7-xv52-hf9f
• https://docs.microsoft.com/en-us/archive/msdn-magazine/2009/november/xml-denial-of-service-attacks-and-defenses
• https://github.com/lkiesow/python-feedgen/commit/f57a01b20fa4aaaeccfa417f28e66b4084b9d0cf
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/T6I5ENUYGFNMIH6ZQ62FZ6VU2WD3SIOI/

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