Partial path traversal in sharpcompress
SharpCompress recreates a hierarchy of directories under destinationDirectory if ExtractFullPath is set to true in options. In order to prevent extraction outside the destination directory the destinationFileName path is verified to begin with fullDestinationDirectoryPath. However it is not enforced that fullDestinationDirectoryPath ends with slash:
public static void WriteEntryToDirectory(IEntry entry,
string destinationDirectory,
ExtractionOptions? options,
Action<string, ExtractionOptions?> write)
{
string destinationFileName;
string file = Path.GetFileName(entry.Key);
string fullDestinationDirectoryPath = Path.GetFullPath(destinationDirectory);
...
throw new ExtractionException("Entry is trying to write a file outside of the destination directory.");
}If the destinationDirectory is not slash terminated like /home/user/dir it is possible to create a file with a name thats begins as the destination directory one level up from the directory, i.e. /home/user/dir.sh.
Impact
Because of the file name and destination directory constraints the arbitrary file creation impact is limited and depends on the use case.
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| .NET (NuGet) | SharpCompress | < 0.29 | 0.29 |
Referencias
- https://github.com/adamhathcock/sharpcompress/security/advisories/GHSA-jp7f-grcv-6mjf
- https://nvd.nist.gov/vuln/detail/CVE-2021-39208
- https://github.com/adamhathcock/sharpcompress/pull/614
- https://github.com/adamhathcock/sharpcompress/commit/ea5c8dc06314c7a5068e7901c51a625224d2b288
- https://github.com/adamhathcock/sharpcompress
- https://github.com/adamhathcock/sharpcompress/releases/tag/0.29.0
- Vector CVSS
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N- Debilidad (CWE)
CWE-22- Plataforma
- .NET (NuGet)
- Paquete
SharpCompress- Publicada
- 20.09.2021
- Actualizado
- 11.10.2026 11:23
Fuentes y licencias
OSV / GitHub Advisory Database - GHSA-jp7f-grcv-6mjf - CC BY 4.0
Historial de vulnerabilidades: SharpCompress
Todas las vulnerabilidades publicadas de este paquete (.NET (NuGet)), 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
- 09.2019 05.2026
- Sin corrección
- 0
- Explotada en ataques
- 0
Distribución por gravedad
- Media 3
Divulgaciones por año
- 2019: 1
- 2020: 0
- 2021: 1
- 2022: 0
- 2023: 0
- 2024: 0
- 2025: 0
- 2026: 1
-
Partial path traversal in sharpcompress esta entrada
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