// For flags

CVE-2019-8320

rubygems: Delete directory using symlink when decompressing tar

Severity Score

7.4
*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

1
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

A Directory Traversal issue was discovered in RubyGems 2.7.6 and later through 3.0.2. Before making new directories or touching files (which now include path-checking code for symlinks), it would delete the target destination. If that destination was hidden behind a symlink, a malicious gem could delete arbitrary files on the user's machine, presuming the attacker could guess at paths. Given how frequently gem is run as sudo, and how predictable paths are on modern systems (/tmp, /usr, etc.), this could likely lead to data loss or an unusable system.

Fue encontrado un problema de salto de directorio (Directory Traversal) en RubyGems versión 2.7.6 y posterior hasta la versión 3.0.2. Antes de crear nuevos directorios o tocar archivos (que ahora incluyen el código path-checking para symlinks), se suprimiría el destino apuntado. Si ese destino estaba oculto detrás de un symlink, una gema maliciosa podría suprimir archivos arbitrarios en la máquina del usuario, presumiendo que el atacante podría adivinar las paths. Dada la frecuencia con que la gema se ejecuta como sudo, y cómo son las paths predecibles en los sistemas modernos (/tmp, /usr, etc.), esto podría probablemente conducir a la pérdida de datos o a un sistema inutilizable.

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
High
Attack Vector
Network
Attack Complexity
Medium
Authentication
None
Confidentiality
None
Integrity
Complete
Availability
Complete
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2019-02-13 CVE Reserved
  • 2019-04-12 CVE Published
  • 2024-05-30 EPSS Updated
  • 2024-08-04 CVE Updated
  • 2024-08-04 First Exploit
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
CWE
  • CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Rubygems
Search vendor "Rubygems"
 Rubygems
Search vendor "Rubygems" for product "Rubygems"
 >= 2.7.6 <= 3.0.2
Search vendor "Rubygems" for product "Rubygems" and version " >= 2.7.6 <= 3.0.2"
-
Affected