Dir.mktmpdir method introduced by tmpdir library accepts the prefix and the suffix of the directory which is created as the first parameter. The prefix can contain relative directory specifiers "../", so this method can be used to target any directory. So, if a script accepts an external input as the prefix, and the targeted directory has inappropriate permissions or the ruby process has inappropriate privileges, the attacker can create a directory or a file at any directory. Affected versions: Ruby 2.2 series: 2.2.9 and earlier Ruby 2.3 series: 2.3.6 and earlier Ruby 2.4 series: 2.4.3 and earlier Ruby 2.5 series: 2.5.0 and earlier External References: https://www.ruby-lang.org/en/news/2018/03/28/unintentional-file-and-directory-creation-with-directory-traversal-cve-2018-6914/
Created ruby tracking bugs for this issue: Affects: fedora-all [bug 1561957]
Low impact because of the filename requirements : path will still contain unpredictable characters. Thus the attacker does not have full control over the filename, or the directory.
Statement: This issue affects the versions of ruby as shipped with Red Hat CloudForms 4. Red Hat Product Security has rated this issue as having security impact of Moderate. A future update may address this issue. For additional information, refer to the Issue Severity Classification: https://access.redhat.com/security/updates/classification/. This issue affects the versions of ruby as shipped with Red Hat Subscription Asset Manager 1. Red Hat Product Security has rated this issue as having security impact of Moderate. A future update may address this issue. For additional information, refer to the Issue Severity Classification: https://access.redhat.com/security/updates/classification/.
Upstream patch: > Affected versions: trunk (r62990): https://github.com/ruby/ruby/commit/10b96900b90914b0cc1dba36f9736c038db2859d > Ruby 2.2 series: 2.2.9 and earlier On ruby_2_2 branch: https://github.com/ruby/ruby/commit/e9ddf2ba41a0bffe1047e33576affd48808c5d0b > Ruby 2.3 series: 2.3.6 and earlier > Ruby 2.4 series: 2.4.3 and earlier > Ruby 2.5 series: 2.5.0 and earlier Check ruby_2_N branches.
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-2018:3729 https://access.redhat.com/errata/RHSA-2018:3729
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-2018:3730 https://access.redhat.com/errata/RHSA-2018:3730
This issue has been addressed in the following products: 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-2018:3731 https://access.redhat.com/errata/RHSA-2018:3731
This issue has been addressed in the following products: Red Hat Enterprise Linux 7 Via RHSA-2019:2028 https://access.redhat.com/errata/RHSA-2019:2028