Samba Symlink Race Condition Lets Remote Authenticated Users View Non-Exported Files on the Target System
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SecurityTracker Alert ID: 1038117 |
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SecurityTracker URL: http://securitytracker.com/id/1038117
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CVE Reference:
CVE-2017-2619
(Links to External Site)
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Date: Mar 23 2017
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Impact:
Disclosure of system information, Disclosure of user information
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Fix Available: Yes Vendor Confirmed: Yes
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Version(s): prior to versions 4.4.12, 4.5.7, 4.6.1
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Description:
A vulnerability was reported in Samba. A remote authenticated user can obtain files on the target system.
A remote authenticated user with write access to the exported portions of the file system on the target server via SMB1 unix extensions or NFS can rename a file on the target share and then create a symbolic link (symlink) to an arbitrary location on the target file system to potentially access the target file.
[Editor's note: The vendor indicates that the race condition is difficult to win but is theoretically possible.]
Jann Horn of Google reported this vulnerability.
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Impact:
A remote authenticated user with write privileges on the target share can obtain files from non-exported directories on the target system.
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Solution:
The vendor has issued a fix (4.4.12, 4.5.7, 4.6.1).
The vendor advisory is available at:
https://www.samba.org/samba/security/CVE-2017-2619.html
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Vendor URL: www.samba.org/samba/security/CVE-2017-2619.html (Links to External Site)
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Cause:
Access control error, State error
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Underlying OS: Linux (Any), UNIX (Any)
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Message History:
This archive entry has one or more follow-up message(s) listed below.
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Source Message Contents
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[Original Message Not Available for Viewing]
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