Описание
svg-sanitizer Bypasses Attribute Sanitization
Problem
The sanitization logic at https://github.com/darylldoyle/svg-sanitizer/blob/0.21.0/src/Sanitizer.php#L454-L481 only searches for lower-case attribute names (e.g. xlink:href instead of xlink:HrEf), which allows to by-pass the isHrefSafeValue check. As a result this allows cross-site scripting or linking to external domains.
Proof-of-concept
provided by azizk
Credits
The mentioned findings and proof-of-concept example were reported to the TYPO3 Security Team by the external security researcher azizk <medazizknani@gmail.com>.
Ссылки
- https://github.com/darylldoyle/svg-sanitizer/security/advisories/GHSA-22wq-q86m-83fh
- https://nvd.nist.gov/vuln/detail/CVE-2025-55166
- https://github.com/darylldoyle/svg-sanitizer/commit/0afa95ea74be155a7bcd6c6fb60c276c39984500
- https://github.com/darylldoyle/svg-sanitizer/commit/5a0a1eaf0c6b0b540dc945fe30c93cf106b357c1
- https://github.com/darylldoyle/svg-sanitizer/blob/0.21.0/src/Sanitizer.php#L454-L481
- https://github.com/darylldoyle/svg-sanitizer/releases/tag/0.22.0
Пакеты
enshrined/svg-sanitize
< 0.22.0
0.22.0
Связанные уязвимости
savg-sanitizer is a PHP SVG/XML sanitizer. Prior to version 0.22.0, the sanitization logic in the cleanXlinkHrefs method only searches for lower-case attribute name, which allows to by-pass the isHrefSafeValue check. As a result this allows cross-site scripting or linking to external domains. This issue has been patched in version 0.22.0.