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Bug 4706

Summary: Big hole in crond
Product: [Retired] Red Hat Linux Reporter: tymm
Component: crontabsAssignee: Crutcher Dunnavant <crutcher>
Status: CLOSED RAWHIDE QA Contact:
Severity: medium Docs Contact:
Priority: high    
Version: 6.0CC: apetr, don, s_ball
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2001-04-10 22:01:03 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:

Description tymm 1999-08-25 18:16:12 UTC
cron_popen is very very trusting, and has multiple problems:

1) for fun, on a system not accepting mail, set
MAILTO=" -bd" and put in an entry like * * * * * ls
wait a minute, and ps -ax | grep sendmail... Now try using
your imagination.

2) there's an overflowable buffer where if you put more than
100 space-seperated items into MAILTO, you get a nice segv.
Looks quite exploitable.

Comment 1 Bill Nottingham 1999-08-25 19:52:59 UTC
Preliminary patch sent - look sane?

Comment 2 Bill Nottingham 1999-08-27 20:35:59 UTC
fixed in errata.