Medium severity · published Aug 22, 2022
CVE-2021-3639
A flaw was found in mod_auth_mellon where it does not sanitize logout URLs properly
6.1
CVSS
1%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)1.0% · higher than 64% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MA
Mod Auth Mellon · Uninett
before 0.18.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-3639
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-3639
Patch
https://access.redhat.com/security/cve/CVE-2021-3639
Issue Tracking
https://bugzilla.redhat.com/show_bug.cgi?id=1980648
Patch
https://github.com/latchset/mod_auth_mellon/commit/42a11261b9dad2e48d70bdff7c53dd57a12db6f5
More from Mod Auth Mellon
7.5
CVE-2016-2146
The am_read_post_data function in mod_auth_mellon before 0.11.1 does not limit the amount of data read, which allows remote attackers to cause a denial of service (worker process…
7.5
CVE-2016-2145
The am_read_post_data function in mod_auth_mellon before 0.11.1 does not check if the ap_get_client_block function returns an error, which allows remote attackers to cause a…
6.1
CVE-2017-6807
mod_auth_mellon before 0.13.1 is vulnerable to a Cross-Site Session Transfer attack, where a user with access to one web site running on a server can copy their session cookie to…
–
CVE-2014-8566
The mod_auth_mellon module before 0.8.1 allows remote attackers to obtain sensitive information or cause a denial of service (segmentation fault) via unspecified vectors related…
–
CVE-2014-8567
The mod_auth_mellon module before 0.8.1 allows remote attackers to cause a denial of service (Apache HTTP server crash) via a crafted logout request that triggers a read of…