CVE-2021-21424 — Prevent user enumeration using Guard or the new Authenticator-based Security

Affected: symfony

Symfony is a PHP framework for web and console applications and a set of reusable PHP components. The ability to enumerate users was possible without relevant permissions due to different handling depending on whether the user existed or not when attempting to use the switch users functionality. We now ensure that 403s are returned whether the user exists or not if a user cannot switch to a user or if the user does not exist. The patch for this issue is available for branch 3.4.

USN-5290-1 — symfony vulnerabilities

Affected: Ubuntu:Pro:18.04:LTS: symfony, Ubuntu:Pro:20.04:LTS: symfony

James Isaac and Mathias Brodala discovered that Symfony incorrectly handled switch users functionality. An attacker could possibly use this issue to enumerate users. (CVE-2021-21424)

It was discovered that Symfony incorrectly handled certain specially crafted CSV files. An attacker could possibly use this issue to execute arbitrary code. This issue only affected Ubuntu 20.04 ESM. (CVE-2021-41270)

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CVE-2021-21424 — Prevent user enumeration using Guard or the new Authenticator-based Security

USN-5290-1 — symfony vulnerabilities