Authenticated file access via overly permissive umask
Published May 26, 2021 · Updated Aug 5, 2024
Improper file permissions in Versa Networks Versa Operating System allow remote authenticated users to read, write, or execute newly created files. Server-wide process creation uses an overly permissive umask, causing new files and directories to receive permissions that expose them beyond their intended owners. An authorized server account is required, after which affected objects can disclose data, accept unauthorized modification, or run attacker-controlled content.
Summary
What happened
Improper file permissions in Versa Networks Versa Operating System allow remote authenticated users to read, write, or execute newly created files. Server-wide process creation uses an overly permissive umask, causing new files and directories to receive permissions that expose them beyond their intended owners. An authorized server account is required, after which affected objects can disclose data, accept unauthorized modification, or run attacker-controlled content.
The record
- CVE
- CVE-2018-16494
- Published
- May 26, 2021
- Updated
- Aug 5, 2024
- Vendor
- Versa Networks
- Product
- Versa Operating System (VOS)
- Classifications
- CWE-377, CWE-668, T1005
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- May 26, 2021CVE publishedPublication date reported by the CVE source.
- Aug 5, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=Fixed Versions: 16.1R2S11, 20.2.2, 21.1.1, 21.2.1
What conditions does exploitation require?
What is affected?
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
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo