Bug 50494

Summary:	pic can be forced to run commands in safe mode
Product:	[Retired] Red Hat Linux	Reporter:	Need Real Name <bendik>
Component:	groff	Assignee:	Florian La Roche <laroche>
Status:	CLOSED RAWHIDE	QA Contact:	Aaron Brown <abrown>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	7.0	Keywords:	Security
Target Milestone:	---
Target Release:	---
Hardware:	i386
OS:	Linux
URL:	http://www.securityfocus.com/bid/3103
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2001-08-09 17:58:33 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Need Real Name 2001-07-31 17:41:41 UTC

From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:0.9.2) Gecko/20010701

Description of problem:
pic can be forced to execute commands (sh X..X) when running in safe mode
(-S). Can be exploited trough lpd (groff/pic is run in printfilters) and
arbitrary commands with id of lpd can be run.


pic command 'plot -1.99892428527521803794 "%n"' will overwrite memory 
where safe mode variable is stored and then it alows to use "sh" command.


How reproducible:
Always

Steps to Reproduce:
1. pic -S 
2. .PS
3. plot -1.99892428527521803794 "%n"
4. sh XidX
5. .PE

	

Actual Results:  uid=501(bendik) gid=501(bendik) ....

Expected Results:  pic:<standard input>:2: unsafe to run command `id'



Additional info:

Bug has been discovered by Zenith Parsec <zen-parse>.
Exploit with patch has been posted to bugtraq (see URL).

I tested groff 1.16 and 1.16.1, both are vulnerable.

Comment 1 Need Real Name 2001-08-09 17:58:29 UTC

When you want to fix this????

--rado b

Comment 2 Florian La Roche 2001-08-14 13:25:06 UTC

is fixed with current rpms: groff-1.17.2-1

Thanks,

Florian La Roche