Important: mod24_auth_mellon

Issue Overview:

A vulnerability was found in mod_auth_mellon. If Apache is configured as a reverse proxy and mod_auth_mellon is configured to only let through authenticated users (with the require valid-user directive), adding special HTTP headers that are normally used to start the special SAML ECP (non-browser based) can be used to bypass authentication. (CVE-2019-3878)

A vulnerability was found in mod_auth_mellon where an open redirect in the logout URL allows requests with backslashes to pass through by assuming that it is a relative URL, while the browsers silently convert backslash characters into forward slashes treating them as an absolute URL. This mismatch allows an attacker to bypass the redirect URL validation logic in apr_uri_parse function. (CVE-2019-3877)

Affected Packages:

mod24_auth_mellon

Issue Correction:
Run yum update mod24_auth_mellon to update your system.

New Packages:

i686:  
    mod24_auth_mellon-diagnostics-0.14.0-2.8.amzn1.i686  
    mod24_auth_mellon-debuginfo-0.14.0-2.8.amzn1.i686  
    mod24_auth_mellon-0.14.0-2.8.amzn1.i686  
  
src:  
    mod24_auth_mellon-0.14.0-2.8.amzn1.src  
  
x86_64:  
    mod24_auth_mellon-diagnostics-0.14.0-2.8.amzn1.x86_64  
    mod24_auth_mellon-debuginfo-0.14.0-2.8.amzn1.x86_64  
    mod24_auth_mellon-0.14.0-2.8.amzn1.x86_64  

Additional References

Red Hat: CVE-2019-3877, CVE-2019-3878

Mitre: CVE-2019-3877, CVE-2019-3878