Vulnerability · Published Aug 22, 2022 · Assigned by redhat
CVE-2021-3639
Medium 6.1
In plain English
A medium-severity open redirect in mod_auth_mellon. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.0% (higher than 64% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)6.1Medium
Exploit odds (30 days)1.0%top 36.1% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:8 | mod_auth_mellon | 0.14.0-12.el8.1 | ALSA-2022:1934 |
| AlmaLinux:8 | mod_auth_mellon-diagnostics | 0.14.0-12.el8.1 | ALSA-2022:1934 |
| Debian:12 | libapache2-mod-auth-mellon | 0.18.0-1 | DEBIAN-CVE-2021-3639 |
| Debian:13 | libapache2-mod-auth-mellon | 0.18.0-1 | DEBIAN-CVE-2021-3639 |
| Debian:14 | libapache2-mod-auth-mellon | 0.18.0-1 | DEBIAN-CVE-2021-3639 |
| Rocky Linux:8 | mod_auth_mellon | 0:0.14.0-12.el8.1 | RLSA-2022:1934 |
| Ubuntu:22.04:LTS | libapache2-mod-auth-mellon | 0.17.0-1ubuntu1 | UBUNTU-CVE-2021-3639 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| n/a | mod_auth_mellon | Fixed in v0.18.0 |
Weakness: CWE-601
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1980648 x_refsource_MISC
- https://access.redhat.com/security/cve/CVE-2021-3639 x_refsource_MISC
- https://github.com/latchset/mod_auth_mellon/commit/42a11261b9dad2e48d70bdff7c53dd57a12db6f5 x_refsource_MISC