Cross-site scripting in RubyGems - CVE-2019-8321

Vulnerability identifier: #VU20194

CSH Severity: Low

CVSS v4: 2.1 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2019-8321

CWE-ID: CWE-79

Exploitation vector: Remote access

Exploit availability: No public exploit available

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data in Gem::UserInteraction#verbose. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

RubyGems
Amazon Linux AMI
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for IBM z Systems
Opensuse
Fedora
EMC Integrated Data Protection Appliance
ruby (Red Hat package)
ruby (Alpine package)
rh-ruby24-ruby (Red Hat package)
rh-ruby25-ruby (Red Hat package)
ruby
Dell EMC Data Protection Search

Install updates from vendor's website.

RubyGems - addressed in versions 2.7.9, 3.0.2
EMC Integrated Data Protection Appliance - update to 2.7.1
ruby (Red Hat package) - update to 2.0.0.648-37.el7_4
ruby (Alpine package) - update to 2.4.6-r0
Dell EMC Data Protection Search - update to 19.6.0
rh-ruby24-ruby (Red Hat package) - addressed in versions 2.4.6-92.el6, 2.4.6-92.el7
rh-ruby25-ruby (Red Hat package) - update to 2.5.5-7.el7
ruby - addressed in versions 2.5.5-101.fc29, 2.5.5-108.fc28

• http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00036.html
• https://hackerone.com/reports/317330

• Amazon Linux AMI update for ruby20, ruby21, ruby24
• Multiple vulnerabilities in RubyGems
• OpenSUSE Linux update for ruby-bundled-gems-rpmhelper, ruby2.5
• Red Hat Enterprise Linux 8 update for the ruby:2.5 module
• Red Hat Enterprise Linux 7 update for ruby
• Cross-site scripting in ruby (Alpine package)
• Multiple vulnerabilities in Dell EMC Integrated Data Protection Appliance
• Multiple vulnerabilities in Dell EMC Data Protection Search
• Red Hat Software Collections update for rh-ruby25-ruby
• Red Hat Software Collections update for rh-ruby24-ruby
• Fedora 29 update for ruby
• Fedora 28 update for ruby