Vulnerabilities > CVE-2021-40346 - Integer Overflow or Wraparound vulnerability in multiple products

CVSS 7.5 - HIGH

Attack vector

NETWORK

Attack complexity

LOW

Privileges required

NONE

Confidentiality impact

NONE

Integrity impact

HIGH

Availability impact

NONE

network

low complexity

NVD

Published: 2021-09-08

Updated: 2024-11-21

Summary

An integer overflow exists in HAProxy 2.0 through 2.5 in htx_add_header that can be exploited to perform an HTTP request smuggling attack, allowing an attacker to bypass all configured http-request HAProxy ACLs and possibly other ACLs.

Vulnerable Configurations

Part	Description	Count
Application	Haproxy Haproxy Haproxy 2.4.0 Haproxy Haproxy 2.4.1 Haproxy Haproxy 2.4.2 Haproxy Haproxy 2.4.3 Haproxy Haproxy 2.3.0 Haproxy Haproxy 2.3.1 Haproxy Haproxy 2.3.2 Haproxy Haproxy 2.3.3 Haproxy Haproxy 2.3.4 Haproxy Haproxy 2.3.5 Haproxy Haproxy 2.3.6 Haproxy Haproxy 2.3.7 Haproxy Haproxy 2.3.8 Haproxy Haproxy 2.3.9 Haproxy Haproxy 2.3.10 Haproxy Haproxy 2.3.11 Haproxy Haproxy 2.3.12 Haproxy Haproxy 2.3.13 Haproxy Haproxy 2.2.0 Haproxy Haproxy 2.2.1 Haproxy Haproxy 2.2.2 Haproxy Haproxy 2.2.3 Haproxy Haproxy 2.2.4 Haproxy Haproxy 2.2.5 Haproxy Haproxy 2.2.6 Haproxy Haproxy 2.2.7 Haproxy Haproxy 2.2.8 Haproxy Haproxy 2.2.9 Haproxy Haproxy 2.2.10 Haproxy Haproxy 2.2.11 Haproxy Haproxy 2.2.12 Haproxy Haproxy 2.2.13 Haproxy Haproxy 2.2.14 Haproxy Haproxy 2.2.15 Haproxy Haproxy 2.2.16 Haproxy Haproxy 2.0.0 Haproxy Haproxy 2.0.1 Haproxy Haproxy 2.0.2 Haproxy Haproxy 2.0.3 Haproxy Haproxy 2.0.4 Haproxy Haproxy 2.0.5 Haproxy Haproxy 2.0.6 Haproxy Haproxy 2.0.7 Haproxy Haproxy 2.0.8 Haproxy Haproxy 2.0.9 Haproxy Haproxy 2.0.10 Haproxy Haproxy 2.0.11 Haproxy Haproxy 2.0.12 Haproxy Haproxy 2.0.13 Haproxy Haproxy 2.0.14 Haproxy Haproxy 2.0.15 Haproxy Haproxy 2.0.16 Haproxy Haproxy 2.0.17 Haproxy Haproxy 2.0.18 Haproxy Haproxy 2.0.19 Haproxy Haproxy 2.0.20 Haproxy Haproxy 2.0.21 Haproxy Haproxy 2.0.22 Haproxy Haproxy 2.0.23 Haproxy Haproxy 2.0.24 Haproxy Haproxy 2.5	67
OS	Debian Debian Debian Linux 11.0	1
OS	Fedoraproject Fedoraproject Fedora 33 Fedoraproject Fedora 34	2

Common Weakness Enumeration (CWE)

CWE-190 - Integer Overflow or Wraparound

Common Attack Pattern Enumeration and Classification (CAPEC)

Forced Integer Overflow
This attack forces an integer variable to go out of range. The integer variable is often used as an offset such as size of memory allocation or similarly. The attacker would typically control the value of such variable and try to get it out of range. For instance the integer in question is incremented past the maximum possible value, it may wrap to become a very small, or negative number, therefore providing a very incorrect value which can lead to unexpected behavior. At worst the attacker can execute arbitrary code.

Summary

Vulnerable Configurations

Common Weakness Enumeration (CWE)

Common Attack Pattern Enumeration and Classification (CAPEC)

References