Denial of Service in uap-core when processing crafted User-Agent strings
Impact
Some regexes are vulnerable to regular expression denial of service (REDoS) due to overlapping capture groups. This allows remote attackers to overload a server by setting the User-Agent header in an HTTP(S) request to maliciously crafted long strings.
Patches
Please update uap-core to >= v0.7.3
Downstream packages such as uap-python, uap-ruby etc which depend upon uap-core follow different version schemes.
Details
Each vulnerable regular expression reported here contains 3 overlapping capture groups. Backtracking has approximately cubic time complexity with respect to the length of the user-agent string.
Regex 1:
\bSmartWatch *\( *([^;]+) *; *([^;]+) *;is vulnerable in portion *([^;]+) * and can be attacked with
"SmartWatch(" + (" " * 3500) + "z"e.g.
SmartWatch( zRegex 2:
; *([^;/]+) Build[/ ]Huawei(MT1-U06|[A-Z]+\d+[^\);]+)[^\);]*\)is vulnerable in portion \d+[^\);]+[^\);]* and can be attacked with
";A Build HuaweiA" + ("4" * 3500) + "z"Regex 3:
(HbbTV)/[0-9]+\.[0-9]+\.[0-9]+ \([^;]*; *(LG)E *; *([^;]*) *;[^;]*;[^;]*;\)is vulnerable in portion *([^;]*) * and can be attacked with
"HbbTV/0.0.0 (;LGE;" + (" " * 3500) + "z"Regex 4:
(HbbTV)/[0-9]+\.[0-9]+\.[0-9]+ \([^;]*; *(?:CUS:([^;]*)|([^;]+)) *; *([^;]*) *;.*;is vulnerable in portions *(?:CUS:([^;]*)|([^;]+)) * and *([^;]*) * and can be attacked with
"HbbTV/0.0.0 (;CUS:;" + (" " * 3500) + "z"
"HbbTV/0.0.0 (;" + (" " * 3500) + "z"
"HbbTV/0.0.0 (;z;" + (" " * 3500) + "z"Reported by Ben Caller @bcaller
Software afectado
Haz clic en una tecnología para ver todas sus vulnerabilidades.
| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Paquete de npm | uap-core | < 0.7.3 | 0.7.3 |
Referencias
- https://github.com/ua-parser/uap-core/security/advisories/GHSA-cmcx-xhr8-3w9p
- https://github.com/ua-parser/uap-ruby/security/advisories/GHSA-pcqq-5962-hvcw
- https://nvd.nist.gov/vuln/detail/CVE-2020-5243
- https://github.com/ua-parser/uap-core/commit/0afd61ed85396a3b5316f18bfd1edfaadf8e88e1
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/user_agent_parser/CVE-2020-5243.yml
- Vector CVSS
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H- Debilidad (CWE)
CWE-1333, CWE-20- Plataforma
- npm
- Paquete
uap-core- Publicada
- 20.02.2020
- Actualizado
- 11.10.2026 10:22
Fuentes y licencias
OSV / GitHub Advisory Database - GHSA-cmcx-xhr8-3w9p - CC BY 4.0
Historial de vulnerabilidades: uap-core
Todas las vulnerabilidades publicadas de este paquete (Paquete de npm), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.
- Entradas en total
- 3
- Primera → última
- 03.2019 02.2021
- Sin corrección
- 0
- Explotada en ataques
- 0
Distribución por gravedad
- Alta 1
- Media 2
Divulgaciones por año
- 2019: 1
- 2020: 1
- 2021: 1
- 2022: 0
- 2023: 0
- 2024: 0
- 2025: 0
- 2026: 0
-
Denial of Service in uap-core when processing crafted User-Agent strings esta entrada
Identifica las vulnerabilidades de tu aplicación
Con la integración de DockRay y el inventario de software activado, DockRay compara las versiones notificadas de los componentes con las vulnerabilidades conocidas y avisa de las coincidencias confirmadas. La cobertura depende de la tecnología compatible y de los avisos disponibles.