Bug 1980648 (CVE-2021-3639)
| Summary: | CVE-2021-3639 mod_auth_mellon: Open Redirect vulnerability in logout URLs | ||
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| Product: | [Other] Security Response | Reporter: | Dhananjay Arunesh <darunesh> |
| Component: | vulnerability | Assignee: | Red Hat Product Security <security-response-team> |
| Status: | CLOSED ERRATA | QA Contact: | |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | unspecified | CC: | hhorak, jhrozek, jorton, luhliari, nkinder, security-response-team, spoore, ssorce, thalman |
| Target Milestone: | --- | Keywords: | Security |
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | If docs needed, set a value | |
| Doc Text: |
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.
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Story Points: | --- |
| Clone Of: | Environment: | ||
| Last Closed: | 2022-05-11 18:16:08 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
| Bug Depends On: | 1986805, 1986806, 1986807, 1988235 | ||
| Bug Blocks: | 1978058 | ||
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Description
Dhananjay Arunesh
2021-07-09 06:39:06 UTC
The vulnerability is in auth_mellon_util.c:am_check_url() function, where there are not enough checks to ensure the redirect URL is fine. An attacker may provide a logout URL, starting with "///", of an application that uses mod_auth_mellon to a victim user, so that he is redirected to another site. The user may pay less attention to the URL as the application that uses mod_auth_mellon may be trusted. Upstream patch: https://github.com/latchset/mod_auth_mellon/commit/42a11261b9dad2e48d70bdff7c53dd57a12db6f5 Created mod_auth_mellon tracking bugs for this issue: Affects: fedora-all [bug 1988235] This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2022:1934 https://access.redhat.com/errata/RHSA-2022:1934 This bug is now closed. Further updates for individual products will be reflected on the CVE page(s): https://access.redhat.com/security/cve/cve-2021-3639 |