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GHSA-wrvw-254r-wpmv
CliInvoke.SpecializationsCliInvoke.SpecializationsAlastairLundy.CliInvoke.SpecializationsImpact
An OS command injection vulnerability exists in the PowerShell and Cmd shell wrappers provided by the CliInvoke.Specializations package (the PowershellProcessInvoker/CmdProcessInvoker invokers, and the UsePowerShell/UseCmd middleware in v3 pre-release versions).
The wrappers re-run a caller-supplied target and arguments inside a shell command (pwsh -Command ... / cmd /c ...). In affected versions the wrapped command was delivered to the operating system as a single ProcessStartInfo.Arguments string. The OS command-line parser re-tokenizes that string before the shell parses it, so a double quote (") in the target or arguments breaks OS-level quoting and lets the wrapped shell reassemble a second, unintended command.
An attacker could exploit this to execute arbitrary commands with the privileges of the host process.
Patches
The Specializations Packages now deliver the command via ProcessStartInfo.ArgumentList (natively where supported, and polyfilled in older TFMs), so that the operating system passes argv verbatim and only the shell parses the command once.
Upgrade to:
- 2.8.5 (2.8.x line)
- 2.9.4 (2.9.x line)
- 2.10.5 (2.10.x line)
- 3.0.0-beta.1 (3.x pre-release line)
Workarounds
No complete workaround is available. Until upgraded:
- Reject or strip
"from any target path or argument passed to the PowerShell/Cmd wrappers. On 2.2.0 – 2.9.2 and 3.0.0-alpha.1 – alpha.4, also reject shell metacharacters (;,|,&,$, backtick, parentheses). - Alternatively, bypass the wrappers for untrusted input and invoke the target process directly so that no second shell parse of the data occurs.
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The vulnerability requires local access to the device to be exploited. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the confidentiality of the information. There is a high impact on the integrity of the data. There is a high impact on the availability of the system.
Exploitation activity has been observed. Apply available patches or mitigations urgently.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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