CVE-2023-6992 - CVE House
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Status published Medium CVE-2023-6992

Memory corruption issues is Cloudflare zlib implementation

Vulnerability Description

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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

  • Martin Schwarzl

References

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Affected Vendor

Affected Software

zlib
Vulnerable Versions:
0

Timeline

Official Publish: January 4th, 2024
Last Modified: September 6th, 2024
Added to House: July 22nd, 2026

CVSS Vectors

V3: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L

Weaknesses (CWE)

CWE-20 CWE-122 CWE-126

MITRE ATT&CK TTPs

T1190 Exploit Public-Facing Application
Initial Access
T1059 Command and Scripting Interpreter
Execution
T1068 Exploitation for Privilege Escalation
Privilege Escalation
T1213 Data from Information Repositories
Collection
T1565.002 Stored Data Manipulation
Impact
T1203 Exploitation for Client Execution
Execution
T1055 Process Injection
Defense Evasion
T1005 Data from Local System
Collection
T1552 Unsecured Credentials
Credential Access
T1040 Network Sniffing
Collection
T1499 Endpoint Denial of Service
Impact