Bug 1691125 (CVE-2019-3877) - CVE-2019-3877 mod_auth_mellon: open redirect in logout url when using URLs with backslashes
Summary: CVE-2019-3877 mod_auth_mellon: open redirect in logout url when using URLs wi...
Alias: CVE-2019-3877
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
Depends On: 1692471 1692472 1691771 1692470 1697488
Blocks: 1691129
TreeView+ depends on / blocked
Reported: 2019-03-20 22:59 UTC by Laura Pardo
Modified: 2019-09-29 15:09 UTC (History)
9 users (show)

Fixed In Version: mod_auth_mellon 0.14.2
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Clone Of:
Last Closed: 2019-06-10 10:51:32 UTC

Attachments (Terms of Use)

System ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2019:0766 None None None 2019-04-16 14:40:25 UTC

Description Laura Pardo 2019-03-20 22:59:00 UTC
A vulnerability was found in mod_auth_mellon. 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 using treating them as an absolute URL. This mismatch allows an attacker to bypass the redirect URL validation logic in apr_uri_parse function.

Comment 1 Laura Pardo 2019-03-21 17:29:46 UTC
Upstream issue:

Comment 3 Pedro Sampaio 2019-03-22 13:27:27 UTC
Created mod_auth_mellon tracking bugs for this issue:

Affects: fedora-all [bug 1691771]

Comment 6 errata-xmlrpc 2019-04-16 14:40:24 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2019:0766 https://access.redhat.com/errata/RHSA-2019:0766

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