VDB-173323 · CVE-2021-27736 · CSNC-2021-004

FusionAuth fusionauth-samlv2 up to 0.5.3 XML parseFromBytes 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.
5.3	$0-$5k	0.00

Summaryinfo

A vulnerability has been found in FusionAuth fusionauth-samlv2 up to 0.5.3 and classified as problematic. The impacted element is the function parseFromBytes of the component XML Handler. This manipulation causes xml external entity reference. This vulnerability appears as CVE-2021-27736. There is no available exploit. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as problematic was found in FusionAuth fusionauth-samlv2 up to 0.5.3. Affected by this vulnerability is the function parseFromBytes of the component XML Handler. The manipulation with an unknown input leads to a xml external entity reference vulnerability. The CWE definition for the vulnerability is 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. The impact remains unknown.

The weakness was presented 04/22/2021 as CSNC-2021-004. It is possible to read the advisory at compass-security.com. This vulnerability is known as CVE-2021-27736. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 0.5.4 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying a patch 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

Vendor

FusionAuth

Name

fusionauth-samlv2

Version

License

open-source

Website

Product: https://github.com/FusionAuth/fusionauth-samlv2/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.5
VulDB Meta Temp Score: 5.3

VulDB Base Score: 5.5
VulDB Temp Score: 5.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
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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: Partially

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: fusionauth-samlv2 0.5.4
Patch: github.com

Timelineinfo

02/25/2021 🔍
04/22/2021 +55 days 🔍
04/22/2021 +0 days 🔍
04/24/2021 +2 days 🔍

Sourcesinfo

Product: github.com

Advisory: CSNC-2021-004
Status: Confirmed

CVE: CVE-2021-27736 (🔍)
GCVE (CVE): GCVE-0-2021-27736
GCVE (VulDB): GCVE-100-173323

Entryinfo

Created: 04/22/2021 20:55
Updated: 04/24/2021 08:16
Changes: 04/22/2021 20:55 (41), 04/24/2021 08:16 (5)
Complete: 🔍
Cache ID: 216::103