When re-using a connection, curl was doing case insensitive comparisons of user name and password with the existing connections. This means that if an unused connection with proper credentials exists for a protocol that has connection-scoped credentials, an attacker can cause that connection to be reused if s/he knows the case-insensitive version of the correct password. External References: https://curl.haxx.se/docs/adv_20161102B.html
Created attachment 1213770 [details] Upstream patch
Created curl tracking bugs for this issue: Affects: fedora-all [bug 1390894]
Created mingw-curl tracking bugs for this issue: Affects: fedora-all [bug 1390895] Affects: epel-7 [bug 1390896]
I want to point out again that this is only a problem if the attacker already knows a case-insensitive version of the password, which is a bigger problem in itself.
This issue has been addressed in the following products: Red Hat JBoss Core Services Via RHSA-2018:2486 https://access.redhat.com/errata/RHSA-2018:2486
This issue has been addressed in the following products: Red Hat Software Collections for Red Hat Enterprise Linux 6 Red Hat Software Collections for Red Hat Enterprise Linux 7 Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUS Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUS Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS Via RHSA-2018:3558 https://access.redhat.com/errata/RHSA-2018:3558