CVE-2023-52081

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.

CVSS v3 5.3 MEDIUM

5.3^/10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/ewen-lbh/ffcss/commit/f9c491874b858a32fcae15045f169fd7d02f90dc	Patch
https://github.com/ewen-lbh/ffcss/security/advisories/GHSA-wpmx-564x-h2mh	Exploit Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:ewen-lbh:firefox_css:*:*:*:*:*:go:*:*

History

29 Feb 2024, 01:42

Type	Values Removed	Values Added
Summary	(en) 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.	(en) 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.

05 Jan 2024, 15:59

Type	Values Removed	Values Added
References	~~() https://github.com/ewen-lbh/ffcss/commit/f9c491874b858a32fcae15045f169fd7d02f90dc -~~	() https://github.com/ewen-lbh/ffcss/commit/f9c491874b858a32fcae15045f169fd7d02f90dc - Patch
References	~~() https://github.com/ewen-lbh/ffcss/security/advisories/GHSA-wpmx-564x-h2mh -~~	() https://github.com/ewen-lbh/ffcss/security/advisories/GHSA-wpmx-564x-h2mh - Exploit, Vendor Advisory
First Time		Ewen-lbh Ewen-lbh firefox Css
CPE		cpe:2.3:a:ewen-lbh:firefox_css::::::go::*
Summary		(es) ffcss es una interfaz CLI para aplicar y configurar temas CSS de Firefox. Antes de 0.2.0, la función `lookupPreprocess()` estaba destinada a aplicar algunas transformaciones a una cadena deshabilitando caracteres en la expresión regular `[-_ .]`. Sin embargo, debido al uso de la normalización Unicode tardía del tipo NFKD, es posible omitir esa validación y volver a introducir todos los caracteres en la expresión regular `[-_ .]`. El `lookupPreprocess()` se puede omitir fácilmente con caracteres Unicode equivalentes como U+FE4D (?), lo que daría como resultado U+005F (_) omitido, por ejemplo. La función `lookupPreprocess()` sólo se utiliza para buscar temas de forma flexible (sin distinguir entre mayúsculas y minúsculas, ignorando guiones, guiones bajos y puntos), por lo que el impacto real en la seguridad se clasifica como bajo. Esta vulnerabilidad se solucionó en 0.2.0. No se conocen workarounds.

28 Dec 2023, 19:05

Type	Values Removed	Values Added
Summary	(en) 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.	(en) 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.

28 Dec 2023, 16:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2023-12-28 16:16

Updated : 2024-02-29 01:42

NVD link : CVE-2023-52081

Mitre link : CVE-2023-52081

CVE.ORG link : CVE-2023-52081

JSON object : View

Products Affected

ewen-lbh

firefox_css

CWE

CWE-74

Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')

CWE-176

Improper Handling of Unicode Encoding

5.3 /10