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

7.5HIGH

Key Information:

Vendor

Go Standard Library

Status
Syscall
Os/exec
Vendor
CVE Published:
2 November 2022

What is CVE-2022-41716?

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".

Affected Version(s)

os/exec windows 0 < 1.18.8

os/exec windows 1.19.0-0 < 1.19.3

syscall windows 0 < 1.18.8

References

https://go.dev/issue/56284
https://go.dev/cl/446916
https://groups.google.com/g/golang-announce/c/mbHY1UY3BaM...

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

RyotaK (https://twitter.com/ryotkak)
.