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AUSCERT External Security Bulletin Redistribution
ESB-2018.2471
base-files vulnerability
22 August 2018
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AusCERT Security Bulletin Summary
---------------------------------
Product: base-files
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Increased Privileges -- Existing Account
Denial of Service -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2018-6557
Original Bulletin:
http://www.ubuntu.com/usn/usn-3748-1
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Ubuntu Security Notice USN-3748-1
August 21, 2018
base-files vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:
- - Ubuntu 18.04 LTS
Summary:
base-files could be made to hang or overwrite files as the administrator.
Software Description:
- - base-files: Debian base system miscellaneous files
Details:
Sander Bos discovered that the MOTD update script incorrectly handled
temporary files. A local attacker could use this issue to cause a denial of
service, or possibly escalate privileges if kernel symlink restrictions
were disabled.
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 18.04 LTS:
base-files 10.1ubuntu2.2
In general, a standard system update will make all the necessary changes.
References:
https://usn.ubuntu.com/usn/usn-3748-1
CVE-2018-6557
Package Information:
https://launchpad.net/ubuntu/+source/base-files/10.1ubuntu2.2
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