CVE-2022-41716: Unsanitized NUL in environment variables on Windows in syscall and os/exec

Description

Due to unsanitized NUL values, attackers may be able to maliciously set environment variables on Windows. In syscall.StartProcess and os/exec.Cmd, invalid environment variable values containing NUL values are not properly checked for. A malicious environment variable value can exploit this behavior to set a value for a different environment variable. For example, the environment variable string "A=B\x00C=D" sets the variables "A=B" and "C=D".

CVSS vector

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

Attack vector

Network

Complexity

Low

Privileges

None

User interaction

None

Confidentiality

None

Integrity

High

Availability

None

Scope

Unchanged

Exploitation

Is it being used?

Exploit prediction (EPSS)0.9% · higher than 58% of CVEs

Exploited in the wildNo evidence yet

CISA KEVNot listed

Ransomware campaign useNot known

Affected products

Which versions

OS

os/exec · Go standard library

before 1.18.8; 1.19.0-0 before 1.19.3 · source: vendor

SY

syscall · Go standard library

before 1.18.8; 1.19.0-0 before 1.19.3 · source: vendor

GO

GO · Golang

before 1.18.8; 1.19.0 before 1.19.3 · source: NVD