Information disclosure in Mozilla Firefox - CVE-2018-18506

CSH
CYBERSECURITY HELP
Sign In REGISTER
 
Main Vulnerability Database Vulnerabilities #VU17264

Information disclosure in Mozilla Firefox - CVE-2018-18506

Published: January 29, 2019


Vulnerability identifier: #VU17264
CSH Severity: Low
CVSS v4: 2.1 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2018-18506
CWE-ID: CWE-200
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due to an error in proxy support implementation. When proxy auto-detection is enabled, if a web server serves a Proxy Auto-Configuration (PAC) file or if a PAC file is loaded locally, this PAC file can specify that requests to the localhost are to be sent through the proxy to another server. This behavior is disallowed by default when a proxy is manually configured, but when enabled could allow for attacks on services and tools that bind to the localhost for networked behavior if they are accessed through browsing.

A remote attacker can trick the victim to visit a specially crafted website and gain unauthorized access to services or resources, exposed on user's system.


Affected software

Mozilla Firefox
Firefox ESR
Arch Linux
Red Hat Enterprise Linux for Scientific Computing
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for Power
Opensuse
Fedora
SUSE Package Hub for SUSE Linux Enterprise
thunderbird (Ubuntu package)
firefox-esr (Debian package)
thunderbird (Debian package)
firefox-esr (Alpine package)
firefox
Mozilla Thunderbird

How to mitigate CVE-2018-18506

Install updates from vendor's website.

Mozilla Firefox - update to 65.0
thunderbird (Ubuntu package) - addressed in versions 1:60.6.1+build2-0ubuntu0.14.04.1, 1:60.6.1+build2-0ubuntu0.16.04.1, 1:60.6.1+build2-0ubuntu0.18.04.1, 1:60.6.1+build2-0ubuntu0.18.10.1
Mozilla Thunderbird - update to 60.6.0
Firefox ESR - update to 60.6.0
firefox-esr (Debian package) - update to 60.6.0esr-1~deb9u1
thunderbird (Debian package) - update to 1:60.6.1-1~deb9u1
firefox-esr (Alpine package) - update to 60.6.1-r0
firefox - addressed in versions 65.0-1.fc28, 65.0-1.fc29

External References

Related Security Bulletins