Information disclosure - CVE-2019-11730

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Main Vulnerability Database Vulnerabilities #VU33439

Information disclosure - CVE-2019-11730

Published: July 23, 2019 / Updated: August 4, 2020


Vulnerability identifier: #VU33439
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2019-11730
CWE-ID: CWE-200
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

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

A vulnerability exists where if a user opens a locally saved HTML file, this file can use file: URIs to access other files in the same directory or sub-directories if the names are known or guessed. The Fetch API can then be used to read the contents of any files stored in these directories and they may uploaded to a server. It was demonstrated that in combination with a popular Android messaging app, if a malicious HTML attachment is sent to a user and they opened that attachment in Firefox, due to that app's predictable pattern for locally-saved file names, it is possible to read attachments the victim received from other correspondents. This vulnerability affects Firefox ESR < 60.8, Firefox < 68, and Thunderbird < 60.8.


Affected software

Gentoo Linux
Red Hat Enterprise Linux for Scientific Computing
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, big endian
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for Power 9
Red Hat Enterprise Linux for IBM System z (Structure A)
Red Hat Enterprise Linux Server - Extended Update Support
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux for Power, big endian - Extended Update Support
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux for x86_64
Slackware Linux
Opensuse
Secure Remote Services (SRS) Virtual Edition
SUSE Package Hub for SUSE Linux Enterprise
firefox-esr (Alpine package)
firefox (Red Hat package)
thunderbird (Red Hat package)
Dell EMC Unity VSA Operating Environment (OE)
Dell EMC Unity XT Operating Environment (OE)
Dell EMC Unity Operating Environment (OE)

How to mitigate CVE-2019-11730

Install update from vendor's website.

Secure Remote Services (SRS) Virtual Edition - update to 3.46.00.04
firefox-esr (Alpine package) - update to 60.8.0-r0
Dell EMC Unity VSA Operating Environment (OE) - update to 5.0.2.0.5.009
Dell EMC Unity XT Operating Environment (OE) - update to 5.0.2.0.5.009
Dell EMC Unity Operating Environment (OE) - update to 5.0.2.0.5.009
firefox (Red Hat package) - addressed in versions 60.8.0-1.el6_10, 60.8.0-1.el7_6, 60.8.0-1.el8_0
thunderbird (Red Hat package) - addressed in versions 60.8.0-1.el6_10, 60.8.0-1.el7_6, 60.8.0-1.el8_0

External References

Related Security Bulletins