// For flags

CVE-2023-20135

 

Severity Score

7.0
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Track*
*SSVC
Descriptions

A vulnerability in Cisco IOS XR Software image verification checks could allow an authenticated, local attacker to execute arbitrary code on the underlying operating system.
This vulnerability is due to a time-of-check, time-of-use (TOCTOU) race condition when an install query regarding an ISO image is performed during an install operation that uses an ISO image. An attacker could exploit this vulnerability by modifying an ISO image and then carrying out install requests in parallel. A successful exploit could allow the attacker to execute arbitrary code on an affected device.

Una vulnerabilidad en las comprobaciones de verificación de imágenes del Software Cisco IOS XR podría permitir que un atacante local autenticado ejecute código arbitrario en el sistema operativo subyacente. Esta vulnerabilidad se debe a una condición de ejecución de tiempo de verificación, tiempo de uso (TOCTOU) cuando se realiza una consulta de instalación relacionada con una imagen ISO durante una operación de instalación que utiliza una imagen ISO. Un atacante podría aprovechar esta vulnerabilidad modificando una imagen ISO y luego realizando solicitudes de instalación en paralelo. Una explotación existosa podría permitir al atacante ejecutar código arbitrario en un dispositivo afectado.

*Credits: N/A
CVSS Scores
Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Attack Vector
Local
Attack Complexity
High
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None
* Common Vulnerability Scoring System
SSVC
  • Decision:Track*
Exploitation
None
Automatable
No
Tech. Impact
Total
* Organization's Worst-case Scenario
Timeline
  • 2022-10-27 CVE Reserved
  • 2023-09-13 CVE Published
  • 2023-09-14 EPSS Updated
  • 2024-10-23 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-347: Improper Verification of Cryptographic Signature
  • CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Cisco
Search vendor "Cisco"
 Ios Xr
Search vendor "Cisco" for product "Ios Xr"
 >= 7.5.2 < 7.6
Search vendor "Cisco" for product "Ios Xr" and version " >= 7.5.2 < 7.6"
-
Affected
Cisco
Search vendor "Cisco"
 Ios Xr
Search vendor "Cisco" for product "Ios Xr"
 >= 7.7 < 7.10.1
Search vendor "Cisco" for product "Ios Xr" and version " >= 7.7 < 7.10.1"
-
Affected