SB2021040106 - Red Hat Enterprise Linux 7 update for flatpak 

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Main Vulnerability Database SB2021040106

SB2021040106 - Red Hat Enterprise Linux 7 update for flatpak

Published: April 1, 2021

Security Bulletin ID SB2021040106
Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 security vulnerability.


1) Improper Neutralization of Special Elements in Output Used by a Downstream Component (CVE-ID: CVE-2021-21381)

The vulnerability allows a remote attacker to bypass implemented security restrictions.

The vulnerability exists due to improper input validation within the "file forwarding" feature. By putting the special tokens `@@` and/or `@@u` in the Exec field of a Flatpak app's .desktop file, a malicious app publisher can trick flatpak into behaving as though the user had chosen to open a target file with their Flatpak app, which automatically makes that file available to the Flatpak app.


Remediation

Install update from vendor's website.

References