Information disclosure via shared-memory slot race
Published Jan 23, 2020 · Updated Aug 6, 2024
Information disclosure in MySecureShell 1.31 allows local users to access another user's directory during concurrent SFTP sessions. SftpWho.c allocates records from a 128-slot shared-memory table without synchronizing the check and reservation, allowing two processes to claim the same slot. Exploitation requires an authenticated local account and a scheduling race; process permissions remain unchanged, but another user's accessible files can be read.
Summary
What happened
Information disclosure in MySecureShell 1.31 allows local users to access another user's directory during concurrent SFTP sessions. SftpWho.c allocates records from a 128-slot shared-memory table without synchronizing the check and reservation, allowing two processes to claim the same slot. Exploitation requires an authenticated local account and a scheduling race; process permissions remain unchanged, but another user's accessible files can be read.
The record
- CVE
- CVE-2013-4176
- Published
- Jan 23, 2020
- Updated
- Aug 6, 2024
- Vendor
- MySecureShell
- Product
- MySecureShell
- Classifications
- CWE-200, T1005
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Jan 23, 2020CVE publishedPublication date reported by the CVE source.
- Aug 6, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=1.31
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.
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Technologies
Your stack
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Your stack
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