漏洞信息
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Vulnerability Title
Quadratic regex backtracking in the html_sanitize_ex CSS scrubber allows CPU-exhaustion denial of service
Vulnerability Description
Inefficient Regular Expression Complexity vulnerability in the CSS scrubber in rrrene html_sanitize_ex allows an unauthenticated remote attacker to exhaust server CPU via a long CSS declaration in sanitized HTML. The declaration regex in HtmlSanitizeEx.Scrubber.CSS.scrub/1 matches the property name with an unbounded greedy [-\w]+ followed by a mandatory :, so a long run of word characters not followed by a colon makes the engine give back one character at a time and retry the colon at every start offset. The work is quadratic in the length of the run, and no length cap is applied to the CSS handed to the scrubber. An 80 KB <style> body costs roughly 2.4 seconds of scheduler time, so a few concurrent requests saturate the BEAM scheduler pool and make the application unresponsive.
The impact is CPU exhaustion only. Nothing is read, modified or disclosed.
This issue affects html_sanitize_ex: from 0.3.1 before 1.4.5 and from 1.5.0-rc.0 before 1.5.3.
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Vulnerability Type
CWE-1333
Vulnerability Title
René Föhring HtmlSanitizeEx 资源管理错误漏洞
Vulnerability Description
WordPress Formidable Forms是WordPress基金会开源的一款表单创建插件。 René Föhring HtmlSanitizeEx 0.3.1版本至1.5.3之前版本存在资源管理错误漏洞,该漏洞源于CSS scrubber中的正则表达式复杂性低效,可能允许未经身份验证的远程攻击者通过长CSS声明耗尽服务器CPU。
CVSS Information
N/A
Vulnerability Type
N/A