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CVE-2023-52081— ewen-lbh/ffcss late-Unicode normalization vulnerability

Quick assessment

Affected
ewen-lbh ffcss
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

ffcss是一个用于应用和配置 Firefox CSS 主题的 CLI 界面。 ffcss 0.2.0之前版本存在安全漏洞，该漏洞源于允许攻击者绕过lookupPreprocess（）函数的限制引入正则表达式的所有字符。

CVSS 5.3 · Medium EPSS 0.52% · P44

Possible ATT&CK Techniques 1 AI

T1608.004 · Drive-by Target
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I. Basic Information for CVE-2023-52081

Vulnerability Information
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Vulnerability Title
ewen-lbh/ffcss late-Unicode normalization vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
ffcss is a CLI interface to apply and configure Firefox CSS themes. Prior to 0.2.0, the function `lookupPreprocess()` is meant to apply some transformations to a string by disabling characters in the regex `[-_ .]`. However, due to the use of late Unicode normalization of type NFKD, it is possible to bypass that validation and re-introduce all the characters in the regex `[-_ .]`. The `lookupPreprocess()` can be easily bypassed with equivalent Unicode characters like U+FE4D (﹍), which would result in the omitted U+005F (_), for instance. The `lookupPreprocess()` function is only ever used to search for themes loosely (case insensitively, while ignoring dashes, underscores and dots), so the actual security impact is classified as low. This vulnerability is fixed in 0.2.0. There are no known workarounds.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
Unicode编码处理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
ffcss 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
ffcss是一个用于应用和配置 Firefox CSS 主题的 CLI 界面。 ffcss 0.2.0之前版本存在安全漏洞，该漏洞源于允许攻击者绕过lookupPreprocess（）函数的限制引入正则表达式的所有字符。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
ewen-lbh ffcss < 0.2.0 -

II. Public POCs for CVE-2023-52081

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III. Intelligence Information for CVE-2023-52081

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Patches & Fixes for CVE-2023-52081 (1)

Vendor Advisories for CVE-2023-52081 (1)

IV. Related Vulnerabilities

Same weakness: CWE-176