VDB-183419 · CVE-2021-41098 · GHSA-2rr5-8q37-2w7h

Nokogiri up to 1.12.4 on Ruby SAX Parser PushParser xml external entity reference

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
7.3	$0-$5k	0.00

Summaryinfo

A vulnerability was found in Nokogiri up to 1.12.4 on Ruby. It has been classified as critical. Impacted is the function Nokogiri::XML::SAX::Parse/Nokogiri::HTML4::SAX::Parser/its alias Nokogiri::HTML::SAX::Parser/Nokogiri::XML::SAX::PushParser/Nokogiri::HTML4::SAX::PushParser/Nokogiri::HTML::SAX::PushParser of the component SAX Parser. The manipulation leads to xml external entity reference. This vulnerability is traded as CVE-2021-41098. It is possible to initiate the attack remotely. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Nokogiri up to 1.12.4 on Ruby (Ruby Gem). It has been rated as critical. This issue affects the function Nokogiri::XML::SAX::Parse/Nokogiri::HTML4::SAX::Parser/its alias Nokogiri::HTML::SAX::Parser/Nokogiri::XML::SAX::PushParser/Nokogiri::HTML4::SAX::PushParser/Nokogiri::HTML::SAX::PushParser of the component SAX Parser. The manipulation with an unknown input leads to a xml external entity reference vulnerability. Using CWE to declare the problem leads to CWE-611. 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. Impacted is confidentiality.

The weakness was shared 09/28/2021 as GHSA-2rr5-8q37-2w7h. It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2021-41098 since 09/15/2021. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 1.12.5 eliminates this vulnerability. Applying the patch 5bf729ff3cc84709ee3c3248c981584088bf9f6d is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

Ruby Gem

Name

Nokogiri

Version

License

open-source

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 7.3

VulDB Base Score: 7.5
VulDB Temp Score: 7.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

CNA Base Score: 7.5
CNA Vector (GitHub, Inc.): 🔍

CVSSv2info

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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Xml external entity reference
CWE: CWE-611 / CWE-610
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Nokogiri 1.12.5
Patch: 5bf729ff3cc84709ee3c3248c981584088bf9f6d

Timelineinfo

09/15/2021 🔍
09/28/2021 +13 days 🔍
09/28/2021 +0 days 🔍
10/02/2021 +4 days 🔍

Sourcesinfo

Advisory: GHSA-2rr5-8q37-2w7h
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2021-41098 (🔍)
GCVE (CVE): GCVE-0-2021-41098
GCVE (VulDB): GCVE-100-183419

Entryinfo

Created: 09/28/2021 02:21
Updated: 10/02/2021 20:53
Changes: 09/28/2021 02:21 (53), 10/02/2021 20:53 (2)
Complete: 🔍
Cache ID: 216::103