Path traversal in Debian Linux - CVE-2017-16654

Detailed vulnerability description

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

An issue was discovered in Symfony before 2.7.38, 2.8.31, 3.2.14, 3.3.13, 3.4-BETA5, and 4.0-BETA5. The Intl component includes various bundle readers that are used to read resource bundles from the local filesystem. The read() methods of these classes use a path and a locale to determine the language bundle to retrieve. The locale argument value is commonly retrieved from untrusted user input (like a URL parameter). An attacker can use this argument to navigate to arbitrary directories via the dot-dot-slash attack, aka Directory Traversal.

How to mitigate CVE-2017-16654

Sources

• https://github.com/symfony/symfony/pull/24994
• https://lists.debian.org/debian-lts-announce/2019/03/msg00009.html
• https://symfony.com/blog/cve-2017-16654-intl-bundle-readers-breaking-out-of-paths
• https://www.debian.org/security/2018/dsa-4262