Vulnerability Details : CVE-2020-5227
Potential exploit
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.
Vulnerability category: Denial of service
Products affected by CVE-2020-5227
- cpe:2.3:a:feedgen_project:feedgen:*:*:*:*:*:python:*:*
Exploit prediction scoring system (EPSS) score for CVE-2020-5227
0.80%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 72 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2020-5227
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
5.0
|
MEDIUM | AV:N/AC:L/Au:N/C:N/I:N/A:P |
10.0
|
2.9
|
NIST | |
|
7.5
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
3.9
|
3.6
|
NIST | |
|
4.4
|
MEDIUM | CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H |
0.7
|
3.6
|
GitHub, Inc. |
CWE ids for CVE-2020-5227
-
The product uses XML documents and allows their structure to be defined with a Document Type Definition (DTD), but it does not properly control the number of recursive definitions of entities.Assigned by:
- nvd@nist.gov (Primary)
- security-advisories@github.com (Secondary)
References for CVE-2020-5227
-
https://docs.microsoft.com/en-us/archive/msdn-magazine/2009/november/xml-denial-of-service-attacks-and-defenses
XML Denial of Service Attacks and Defenses | Microsoft DocsExploit;Patch;Third Party Advisory;Vendor Advisory
-
https://github.com/lkiesow/python-feedgen/commit/f57a01b20fa4aaaeccfa417f28e66b4084b9d0cf
Merge pull request from GHSA-g8q7-xv52-hf9f · lkiesow/python-feedgen@f57a01b · GitHubPatch
-
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/T6I5ENUYGFNMIH6ZQ62FZ6VU2WD3SIOI/
[SECURITY] Fedora 31 Update: python-feedgen-0.9.0-1.fc31 - package-announce - Fedora Mailing-Lists
-
https://github.com/lkiesow/python-feedgen/security/advisories/GHSA-g8q7-xv52-hf9f
Feedgen Vulnerable Against XML Denial of Service Attacks · Advisory · lkiesow/python-feedgen · GitHubThird Party Advisory
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