RHSA-2020:0542 - Security Advisory

Topic

An update for ruby is now available for Red Hat Enterprise Linux 7.5 Extended Update Support.

Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Description

Ruby is an extensible, interpreted, object-oriented, scripting language. It has features to process text files and to perform system management tasks.

Security Fix(es):

• ruby: DoS by large request in WEBrick (CVE-2018-8777)
• ruby: Unintentional directory traversal by poisoned NULL byte in Dir (CVE-2018-8780)
• rubygems: Path traversal when writing to a symlinked basedir outside of the root (CVE-2018-1000073)
• rubygems: Unsafe Object Deserialization Vulnerability in gem owner allowing arbitrary code execution on specially crafted YAML (CVE-2018-1000074)
• rubygems: Improper verification of signatures in tarball allows to install mis-signed gem (CVE-2018-1000076)
• rubygems: Missing URL validation on spec home attribute allows malicious gem to set an invalid homepage URL (CVE-2018-1000077)
• rubygems: XSS vulnerability in homepage attribute when displayed via gem server (CVE-2018-1000078)
• rubygems: Path traversal issue during gem installation allows to write to arbitrary filesystem locations (CVE-2018-1000079)
• rubygems: Infinite loop vulnerability due to negative size in tar header causes Denial of Service (CVE-2018-1000075)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

Affected Products

• Red Hat Enterprise Linux for x86_64 - Extended Update Support 7.5 x86_64
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 7.5 s390x
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 7.5 ppc64
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 7.5 ppc64le
• Red Hat Enterprise Linux EUS Compute Node 7.5 x86_64

Fixes

• BZ - 1547418 - CVE-2018-1000073 rubygems: Path traversal when writing to a symlinked basedir outside of the root
• BZ - 1547419 - CVE-2018-1000074 rubygems: Unsafe Object Deserialization Vulnerability in gem owner allowing arbitrary code execution on specially crafted YAML
• BZ - 1547420 - CVE-2018-1000075 rubygems: Infinite loop vulnerability due to negative size in tar header causes Denial of Service
• BZ - 1547421 - CVE-2018-1000076 rubygems: Improper verification of signatures in tarball allows to install mis-signed gem
• BZ - 1547422 - CVE-2018-1000077 rubygems: Missing URL validation on spec home attribute allows malicious gem to set an invalid homepage URL
• BZ - 1547425 - CVE-2018-1000078 rubygems: XSS vulnerability in homepage attribute when displayed via gem server
• BZ - 1547426 - CVE-2018-1000079 rubygems: Path traversal issue during gem installation allows to write to arbitrary filesystem locations
• BZ - 1561949 - CVE-2018-8780 ruby: Unintentional directory traversal by poisoned NULL byte in Dir
• BZ - 1561950 - CVE-2018-8777 ruby: DoS by large request in WEBrick

CVEs

• CVE-2018-8777
• CVE-2018-8780
• CVE-2018-1000073
• CVE-2018-1000074
• CVE-2018-1000075
• CVE-2018-1000076
• CVE-2018-1000077
• CVE-2018-1000078
• CVE-2018-1000079

References

• https://access.redhat.com/security/updates/classification/#moderate