CVE-2021-28965 : The REXML gem before 3.2.5 in Ruby before 2.6.7, 2.7.x before 2.7.3, and 3.x bef

The REXML gem before 3.2.5 in Ruby before 2.6.7, 2.7.x before 2.7.3, and 3.x before 3.0.1 does not properly address XML round-trip issues. An incorrect document can be produced after parsing and serializing.

Published 2021-04-21 07:15:08

Updated 2021-06-02 18:37:26

Source MITRE

View at NVD, CVE.org

Vulnerability category: XML external entity (XXE) injection

Products affected by CVE-2021-28965

Fedoraproject » Fedora » Version: 34
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
Matching versions
Ruby-lang » Ruby
Versions before (<) 2.6.7
cpe:2.3:a:ruby-lang:ruby:*:*:*:*:*:*:*:*
Matching versions
Ruby-lang » Ruby
Versions from including (>=) 2.7.0 and before (<) 2.7.3
cpe:2.3:a:ruby-lang:ruby:*:*:*:*:*:*:*:*
Matching versions
Ruby-lang » Ruby
Versions from including (>=) 3.0.0 and before (<) 3.0.1
cpe:2.3:a:ruby-lang:ruby:*:*:*:*:*:*:*:*
Matching versions
Ruby-lang » Rexml » For Ruby
Versions before (<) 3.2.5
cpe:2.3:a:ruby-lang:rexml:*:*:*:*:*:ruby:*:*
Matching versions

Threat overview for CVE-2021-28965

Top countries where our scanners detected CVE-2021-28965

Top open port discovered on systems with this issue 80

IPs affected by CVE-2021-28965 6,905

Threat actors abusing to this issue? Yes

Find out if you^* are affected by CVE-2021-28965!

^*Directly or indirectly through your vendors, service providers and 3rd parties. Powered by attack surface intelligence from SecurityScorecard.

Exploit prediction scoring system (EPSS) score for CVE-2021-28965

EPSS FAQ

0.08%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 37 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-28965

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
5.0	MEDIUM	AV:N/AC:L/Au:N/C:N/I:P/A:N	10.0	2.9	NIST
Access Vector: Network Access Complexity: Low Authentication: None Confidentiality Impact: None Integrity Impact: Partial Availability Impact: None
7.5	HIGH	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N	3.9	3.6	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: None Integrity: High Availability: None

CWE ids for CVE-2021-28965

CWE-611 Improper Restriction of XML External Entity Reference

The product processes an XML document that can contain XML entities with URIs that resolve to documents outside of the intended sphere of control, causing the product to embed incorrect documents into its output.

Assigned by: nvd@nist.gov (Primary)

References for CVE-2021-28965

https://www.ruby-lang.org/en/news/2021/04/05/xml-round-trip-vulnerability-in-rexml-cve-2021-28965/

CVE-2021-28965: XML round-trip vulnerability in REXML
Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WTVFTLFVCSUE5CXHINJEUCKSHU4SWDMT/

[SECURITY] Fedora 34 Update: rubygem-pry-0.13.1-5.fc34 - package-announce - Fedora Mailing-Lists
Mailing List;Third Party Advisory
https://security.netapp.com/advisory/ntap-20210528-0003/

CVE-2021-28965 Ruby Vulnerability in NetApp Products | NetApp Product Security
Third Party Advisory