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6.1
MEDIUM CVSS 3.1
CVE-2021-3639
Apache mod_auth_mellon URL Sanitization Phishing Vulnerability
Description

A flaw was found in mod_auth_mellon where it does not sanitize logout URLs properly. This issue could be used by an attacker to facilitate phishing attacks by tricking users into visiting a trusted web application URL that redirects to an external and potentially malicious server. The highest threat from this liability is to confidentiality and integrity.

INFO

Published Date :

Aug. 22, 2022, 3:15 p.m.

Last Modified :

Nov. 21, 2024, 6:22 a.m.

Remotely Exploit :

Yes !

Source :

[email protected]
Affected Products

The following products are affected by CVE-2021-3639 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Uninett mod_auth_mellon
: Total Affected Vendor : 1 | Products : 1
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 3.1 MEDIUM [email protected]
Solution
Update mod_auth_mellon and related packages to address the URL sanitization vulnerability.
  • Update mod_auth_mellon packages.
  • Update mod_auth_mellon-diagnostics packages.
  • Update apache2-mod_auth_mellon-doc packages.
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2021-3639.

URL Resource
https://access.redhat.com/security/cve/CVE-2021-3639 Patch Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1980648 Issue Tracking Third Party Advisory
https://github.com/latchset/mod_auth_mellon/commit/42a11261b9dad2e48d70bdff7c53dd57a12db6f5 Patch Third Party Advisory
https://access.redhat.com/security/cve/CVE-2021-3639 Patch Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1980648 Issue Tracking Third Party Advisory
https://github.com/latchset/mod_auth_mellon/commit/42a11261b9dad2e48d70bdff7c53dd57a12db6f5 Patch Third Party Advisory
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2021-3639 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2021-3639 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2021-3639 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2021-3639 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by af854a3a-2127-422b-91ae-364da2661108

    Nov. 21, 2024

    Action Type Old Value New Value
    Added Reference https://access.redhat.com/security/cve/CVE-2021-3639
    Added Reference https://bugzilla.redhat.com/show_bug.cgi?id=1980648
    Added Reference https://github.com/latchset/mod_auth_mellon/commit/42a11261b9dad2e48d70bdff7c53dd57a12db6f5
  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • CVE Modified by [email protected]

    Feb. 12, 2023

    Action Type Old Value New Value
    Removed CVSS V3 Red Hat, Inc. AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
    Removed Reference https://access.redhat.com/errata/RHSA-2022:1934 [No Types Assigned]
    Added CWE Red Hat, Inc. CWE-601
  • CVE Modified by [email protected]

    Feb. 02, 2023

    Action Type Old Value New Value
    Added CVSS V3 Red Hat, Inc. AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
    Added Reference https://access.redhat.com/errata/RHSA-2022:1934 [No Types Assigned]
    Removed CWE Red Hat, Inc. CWE-601
  • Initial Analysis by [email protected]

    Aug. 26, 2022

    Action Type Old Value New Value
    Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
    Changed Reference Type https://access.redhat.com/security/cve/CVE-2021-3639 No Types Assigned https://access.redhat.com/security/cve/CVE-2021-3639 Patch, Third Party Advisory
    Changed Reference Type https://bugzilla.redhat.com/show_bug.cgi?id=1980648 No Types Assigned https://bugzilla.redhat.com/show_bug.cgi?id=1980648 Issue Tracking, Third Party Advisory
    Changed Reference Type https://github.com/latchset/mod_auth_mellon/commit/42a11261b9dad2e48d70bdff7c53dd57a12db6f5 No Types Assigned https://github.com/latchset/mod_auth_mellon/commit/42a11261b9dad2e48d70bdff7c53dd57a12db6f5 Patch, Third Party Advisory
    Added CWE NIST CWE-601
    Added CPE Configuration OR *cpe:2.3:a:uninett:mod_auth_mellon:*:*:*:*:*:*:*:* versions up to (excluding) 0.18.0
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
Vulnerability Scoring Details
Base CVSS Score: 6.1
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact
Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.13 }} 0.01%

score

0.33384

percentile