CVE-2024-25117: php-svg-lib lacks path validation on font through SVG inline styles
First published: Wed Feb 21 2024(Updated: )
### Summary php-svg-lib fails to validate that font-family doesn't contain a PHAR url, which might leads to RCE on PHP < 8.0, and doesn't validate if external references are allowed. This might leads to bypass of restrictions or RCE on projects that are using it, if they do not strictly revalidate the fontName that is passed by php-svg-lib. ### Details The Style::fromAttributes(), or the Style::parseCssStyle() should check the content of the `font-family` and prevents it to use a PHAR url, to avoid passing an invalid and dangerous `fontName` value to other libraries. The same check as done in the Style::fromStyleSheets might be reused : ``` if ( \array_key_exists("font-family", $styles) && ( \strtolower(\substr($this->href, 0, 7)) === "phar://" || ($this->document->allowExternalReferences === false && \strtolower(\substr($this->href, 0, 5)) !== "data:") ) ) { unset($style["font-family"]); } ``` ### PoC Parsing the following SVG : ``` <?xml version="1.0" encoding="UTF-8" standalone="no"?> <svg xmlns:svg="http://www.w3.org/2000/svg" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="200" height="200"> <text x="20" y="35" style="color:red;font-family:phar:///path/to/whatever.phar/blaklis;">My</text> </svg> ``` will pass the `phar:///path/to/whatever.phar/blaklis` as `$family` in `SurfaceCpdf::setFont`, which is then passed to the canvas `selectFont` as a `$fontName`. ### Impact Libraries using this library as a dependency might be vulnerable to some bypass of restrictions, or even RCE, if they do not double check the value of the `fontName` that is passed by php-svg-lib
Credit: security-advisories@github.com security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| composer/phenx/php-svg-lib | <0.5.2 | 0.5.2 |
| All of | ||
| Dompdf Php-svg-lib | <0.5.2 | |
| PHP | <8.0.0 |
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Reference Links
- https://github.com/dompdf/php-svg-lib/security/advisories/GHSA-f3qr-qr4x-j273
- https://github.com/dompdf/php-svg-lib/commit/732faa9fb4309221e2bd9b2fda5de44f947133aa
- https://github.com/dompdf/php-svg-lib/commit/8ffcc41bbde39f09f94b9760768086f12bbdce42
- https://nvd.nist.gov/vuln/detail/CVE-2024-25117
- https://github.com/advisories/GHSA-f3qr-qr4x-j273 (Advisory)
Frequently Asked Questions
What is the severity of CVE-2024-25117?
CVE-2024-25117 is considered a critical vulnerability due to its potential for remote code execution (RCE) on affected PHP versions.
How do I fix CVE-2024-25117?
To fix CVE-2024-25117, update the php-svg-lib package to version 0.5.3 or higher.
Which versions of PHP are affected by CVE-2024-25117?
CVE-2024-25117 affects PHP versions prior to 8.0.
What impact does CVE-2024-25117 have on software projects?
CVE-2024-25117 may allow attackers to bypass restrictions or execute arbitrary code, posing a serious threat to the security of affected projects.
Is there a known fix or workaround for CVE-2024-25117 besides updating?
There are no known workarounds that effectively mitigate CVE-2024-25117, so upgrading is the recommended course of action.
- agent/title
- agent/first-publish-date
- agent/type
- agent/description
- collector/github-advisory-latest
- source/GitHub
- alias/GHSA-f3qr-qr4x-j273
- alias/CVE-2024-25117
- agent/software-canonical-lookup
- agent/references
- agent/author
- collector/nvd-cve
- source/NVD
- collector/github-advisory
- collector/epss-latest
- source/FIRST
- agent/epss
- collector/mitre-cve
- source/MITRE
- agent/trending
- agent/source
- collector/nvd-api
- agent/weakness
- agent/severity
- agent/remedy
- agent/last-modified-date
- agent/softwarecombine
- agent/event
- agent/tags
- package-manager/composer
- vendor/dompdf
- canonical/dompdf php-svg-lib
- vendor/php
- canonical/php