// For flags

CVE-2023-6992

Memory corruption issues is Cloudflare zlib implementation

Severity Score

5.5
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Track
*SSVC
Descriptions

Cloudflare version of zlib library was found to be vulnerable to memory corruption issues affecting the deflation algorithm implementation (deflate.c). The issues resulted from improper input validation and heap-based buffer overflow.
A local attacker could exploit the problem during compression using a crafted malicious file potentially leading to denial of service of the software.
Patches: The issue has been patched in commit 8352d10 https://github.com/cloudflare/zlib/commit/8352d108c05db1bdc5ac3bdf834dad641694c13c . The upstream repository is not affected.

Se descubrió que la versión Cloudflare de la librería zlib era vulnerable a problemas de corrupción de memoria que afectan la implementación del algoritmo de deflación (deflate.c). Los problemas se debieron a una validación de entrada incorrecta y a un desbordamiento de búfer de almacenamiento dinámico. Un atacante local podría aprovechar el problema durante la compresión utilizando un archivo malicioso manipulado que podría provocar una denegación de servicio del software. Parches: el problema se solucionó en el commit 8352d10 https://github.com/cloudflare/zlib/commit/8352d108c05db1bdc5ac3bdf834dad641694c13c. El repositorio ascendente no se ve afectado.

*Credits: Martin Schwarzl
CVSS Scores
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Attack Vector
Local
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
Low
* Common Vulnerability Scoring System
SSVC
  • Decision:Track
Exploitation
None
Automatable
No
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2023-12-20 CVE Reserved
  • 2024-01-04 CVE Published
  • 2024-01-10 EPSS Updated
  • 2024-09-06 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-20: Improper Input Validation
  • CWE-122: Heap-based Buffer Overflow
  • CWE-126: Buffer Over-read
  • CWE-787: Out-of-bounds Write
CAPEC
  • CAPEC-17: Using Malicious Files
  • CAPEC-100: Overflow Buffers
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Cloudflare
Search vendor "Cloudflare"
 Zlib
Search vendor "Cloudflare" for product "Zlib"
 < 2023-11-16
Search vendor "Cloudflare" for product "Zlib" and version " < 2023-11-16"
-
Affected