Vulnerability Information
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Vulnerability Title
Dompdf possible DoS caused by infinite recursion when parsing SVG images
Vulnerability Description
Dompdf is an HTML to PDF converter for PHP. When parsing SVG images Dompdf performs an initial validation to ensure that paths within the SVG are allowed. One of the validations is that the SVG document does not reference itself. However, prior to version 2.0.4, a recursive chained using two or more SVG documents is not correctly validated. Depending on the system configuration and attack pattern this could exhaust the memory available to the executing process and/or to the server itself. php-svg-lib, when run in isolation, does not support SVG references for `image` elements. However, when used in combination with Dompdf, php-svg-lib will process SVG images referenced by an `image` element. Dompdf currently includes validation to prevent self-referential `image` references, but a chained reference is not checked. A malicious actor may thus trigger infinite recursion by chaining references between two or more SVG images. When Dompdf parses a malicious payload, it will crash due after exceeding the allowed execution time or memory usage. An attacker sending multiple request to a system can potentially cause resource exhaustion to the point that the system is unable to handle incoming request. Version 2.0.4 contains a fix for this issue.
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Vulnerability Type
输入验证不恰当
Vulnerability Title
Dompdf 安全漏洞
Vulnerability Description
Dompdf是一个 HTML 到 PDF 的转换器。 Dompdf 2.0.4之前版本存在安全漏洞，该漏洞源于递归链接未正确验证，可能会耗尽执行进程和/或服务器本身可用的内存。
CVSS Information
N/A
Vulnerability Type
N/A