Privilege escalation via unquoted Bash completion
Published Feb 25, 2022 · Updated Apr 21, 2025
Command injection in Google fscrypt 0.3.2 and earlier allows local users to run shell commands through crafted mountpoint paths. The Bash completion helper feeds mountpoints from fscrypt status into compgen -W without single-quoting or escaping shell metacharacters, causing command substitution during completion. Exploitation requires control of a mounted path and an administrator to invoke fscrypt tab completion, enabling commands to run with that administrator's privileges.
Summary
What happened
Command injection in Google fscrypt 0.3.2 and earlier allows local users to run shell commands through crafted mountpoint paths. The Bash completion helper feeds mountpoints from fscrypt status into compgen -W without single-quoting or escaping shell metacharacters, causing command substitution during completion. Exploitation requires control of a mounted path and an administrator to invoke fscrypt tab completion, enabling commands to run with that administrator's privileges.
The record
- CVE
- CVE-2022-25328
- Published
- Feb 25, 2022
- Updated
- Apr 21, 2025
- Vendor
- Product
- fscrypt
- Classifications
- CWE-78, T1059.004
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Feb 25, 2022CVE publishedPublication date reported by the CVE source.
- Apr 21, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=unspecified <=0.3.2
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Malicious mountpoint Bash-completion demonstrationproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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