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Category:   Application (Generic)  >   Cron Vendors:   Vixie, Paul
Debian/Ubuntu Cron Symlink Validation Flaw Lets Local Users Bypass Security Restrictions
SecurityTracker Alert ID:  1038651
SecurityTracker URL:
CVE Reference:   CVE-2017-9525   (Links to External Site)
Date:  Jun 9 2017
Impact:   Root access via local system
Vendor Confirmed:  Yes  
Version(s): 3.0pl1-128 and prior on Debian; 3.0pl1-128ubuntu2 and prior on Ubuntu
Description:   A vulnerability was reported in Cron on Debian/Ubuntu. A local user can bypass security restrictions.

A local user can with crontab group privileges can conduct a symlink attack to exploit a flaw in the postinst maintainer script to bypass crontab privilege separation controls and gain root privileges on the target system.

The original advisory is available at:

Solar Designer reported this vulnerability.

Impact:   A local user can bypass security controls on the target system.
Solution:   No solution was available at the time of this entry.
Cause:   Access control error
Underlying OS:  Linux (Debian), Linux (Ubuntu)

Message History:   None.

 Source Message Contents

[Original Message Not Available for Viewing]

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