XSS in Sensiolabs Symfony
CVE-2017-18343
The debug handler in Symfony before v2.7.33, 2.8.x before v2.8.26, 3.x before v3.2.13, and 3.3.x before v3.3.6 has XSS via an array key during exception pretty printing in ExceptionHandler.php, as demonstrated by a /_debugbar/open?op=get URI. NOTE: the vendor's position is that this is not a vulnerability because the debug tools are not intended for production use. NOTE: the Symfony Debug component is used by Laravel Debugbar
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.061 (93.2th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 93rd percentile — 93.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.061 · newest: 0.061 · change: 0.000
Affected products
Weakness classification (CWE)
References
- github.com/symfony/symfony/pull/23684 (Third Party Advisory)
- github.com/symfony/debug/pull/7/commits/e48bda29143bd1a83001780b4a78e483822d985c (Patch, Third Party Advisory)
- github.com/symfony/symfony/issues/27987 (Exploit, Third Party Advisory)
- github.com/barryvdh/laravel-debugbar/issues/850 (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2017-18343?
- CVE-2017-18343 is a medium-severity vulnerability in Sensiolabs Symfony, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2018-07-20.
- How severe is CVE-2017-18343?
- Medium severity. CVSS v3 base score is 6.1 out of 10.