CVE-2021-28965

ruby: XML round-trip vulnerability in REXML

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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.

El REXML gem versiones anteriores a 3.2.5 en Ruby versiones anteriores a 2.6.7, versiones 2.7.x anteriores a 2.7.3 y versiones 3.x anteriores a 3.0.1, no aborda apropiadamente los problemas round-trip de XML. Puede ser producido un documento incorrecto después de analizarlo y serializarlo

A flaw was found in the way the Ruby REXML library parsed XML documents. Parsing a specially crafted XML document using REXML and writing parsed data back to a new XML document results in creating a document with a different structure. This issue could affect the integrity of processed data in applications using REXML that parse XML documents, write data back to XML, and re-parse them again.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

Partial

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-03-22 CVE Reserved
2021-04-21 CVE Published
2024-01-05 EPSS Updated
2024-08-03 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-611: Improper Restriction of XML External Entity Reference

CAPEC

References (5)

URL	Tag	Source
https://security.netapp.com/advisory/ntap-20210528-0003	Third Party Advisory

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WTVFTLFVCSUE5CXHINJEUCKSHU4SWDMT	2023-11-07
https://www.ruby-lang.org/en/news/2021/04/05/xml-round-trip-vulnerability-in-rexml-cve-2021-28965	2023-11-07
https://access.redhat.com/security/cve/CVE-2021-28965	2022-02-21
https://bugzilla.redhat.com/show_bug.cgi?id=1947526	2022-02-21

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Ruby-lang Search vendor "Ruby-lang"		Rexml Search vendor "Ruby-lang" for product "Rexml"				< 3.2.5 Search vendor "Ruby-lang" for product "Rexml" and version " < 3.2.5"		ruby		Affected
Ruby-lang Search vendor "Ruby-lang"		Ruby Search vendor "Ruby-lang" for product "Ruby"				< 2.6.7 Search vendor "Ruby-lang" for product "Ruby" and version " < 2.6.7"		-		Affected
Ruby-lang Search vendor "Ruby-lang"		Ruby Search vendor "Ruby-lang" for product "Ruby"				>= 2.7.0 < 2.7.3 Search vendor "Ruby-lang" for product "Ruby" and version " >= 2.7.0 < 2.7.3"		-		Affected
Ruby-lang Search vendor "Ruby-lang"		Ruby Search vendor "Ruby-lang" for product "Ruby"				>= 3.0.0 < 3.0.1 Search vendor "Ruby-lang" for product "Ruby" and version " >= 3.0.0 < 3.0.1"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				34 Search vendor "Fedoraproject" for product "Fedora" and version "34"		-		Affected