GHSA-hc8w-h2mf-hp59 PowerShell Command Injection in Podman HyperV Machine

• Go github.com/containers/podman/v4: >= 4.8.0, <= 4.9.5 (no fix yet) • Go github.com/containers/podman/v5: < 5.8.2 → fixed in 5.8.2

Summary A command injection vulnerability exists in Podman's HyperV machine backend. The VM image path is inserted into a PowerShell double-quoted string without sanitization, allowing `$()` subexpression injection. Affected Code File: `pkg/machine/hyperv/stubber.go:647` ```go resize := exec.Command("powershell", []string{ "-command", fmt.Sprintf("Resize-VHD \"%s\" %d", imagePath.GetPath(), newSize.ToBytes()), }...) ``` Root Cause PowerShell evaluates `$()` subexpressions inside double-quoted strings before executing the outer command. The `fmt.Sprintf` call places the user-controlled image path directly into double quotes without escaping or sanitization. Impact An attacker who can control the VM image path (through a crafted machine name or image directory) can execute arbitrary PowerShell commands with the privileges of the Podman process on the Windows host. On typical Windows installations, this means SYSTEM-level code execution. Patch https://github.com/containers/podman/commit/571c842bd357ee626019ea97d030fb772fc654ed The affected code is only used on Windows, all other operating systems are not affected by this and can thus ignore the CVE patch. Credit We like to thank Sang-Hoon Choi (@KoreaSecurity) for reporting this issue to us.