VDB-179447 · CVE-2021-32786 · Nessus 236723

ZmartZone mod_auth_openidc up to 2.4.8 Regular Expression oidc_validate_redirect_url

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.
6.0	$0-$5k	0.00

Summaryinfo

A vulnerability identified as critical has been detected in ZmartZone mod_auth_openidc up to 2.4.8. This issue affects the function oidc_validate_redirect_url of the component Regular Expression Handler. The manipulation leads to redirect. This vulnerability is uniquely identified as CVE-2021-32786. The attack is possible to be carried out remotely. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in ZmartZone mod_auth_openidc up to 2.4.8 and classified as critical. This issue affects the function oidc_validate_redirect_url of the component Regular Expression Handler. The manipulation with an unknown input leads to a redirect vulnerability. Using CWE to declare the problem leads to CWE-601. A web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a Redirect. This simplifies phishing attacks. Impacted is confidentiality, integrity, and availability.

The weakness was disclosed 07/23/2021. It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2021-32786. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1204.001 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 236723 (Alibaba Cloud Linux 3 : 0135: mod_auth_openidc:2.3 (ALINUX3-SA-2022:0135)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 2.4.9 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.

The vulnerability is also documented in the databases at Tenable (236723) and CERT Bund (WID-SEC-2023-0580). Be aware that VulDB is the high quality source for vulnerability data.

Affected

Debian Linux
Fedora Linux
SUSE Linux
Oracle Linux
Red Hat Enterprise Linux

Productinfo

Vendor

ZmartZone

Name

mod_auth_openidc

Version

License

open-source

Website

Product: https://github.com/zmartzone/mod_auth_openidc/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.0

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Redirect
CWE: CWE-601
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

Nessus ID: 236723
Nessus Name: Alibaba Cloud Linux 3 : 0135: mod_auth_openidc:2.3 (ALINUX3-SA-2022:0135)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: mod_auth_openidc 2.4.9
Patch: github.com

Timelineinfo

05/12/2021 🔍
07/23/2021 +72 days 🔍
07/23/2021 +0 days 🔍
01/02/2026 +1624 days 🔍

Sourcesinfo

Product: github.com

Advisory: github.com
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2021-32786 (🔍)
GCVE (CVE): GCVE-0-2021-32786
GCVE (VulDB): GCVE-100-179447
CERT Bund: WID-SEC-2023-0580 - Red Hat Enterprise Linux (mod_auth_openidc): Mehrere Schwachstellen

Entryinfo

Created: 07/23/2021 07:26
Updated: 01/02/2026 03:03
Changes: 07/23/2021 07:26 (41), 07/27/2021 11:59 (3), 07/27/2021 12:06 (1), 05/16/2025 18:03 (16), 01/02/2026 03:03 (7)
Complete: 🔍
Cache ID: 216::103