Bug 1459152 (CVE-2017-1000368) - CVE-2017-1000368 sudo: Privilege escalation via improper get_process_ttyname() parsing (insufficient fix for CVE-2017-1000367)
Summary: CVE-2017-1000368 sudo: Privilege escalation via improper get_process_ttyname(...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2017-1000368
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
: 1458425 (view as bug list)
Depends On: 1459407 1459408 1459409 1459410 1459411
Blocks: 1458426
TreeView+ depends on / blocked
 
Reported: 2017-06-06 12:26 UTC by Andrej Nemec
Modified: 2021-02-17 02:03 UTC (History)
11 users (show)

Fixed In Version: sudo 1.8.20p2
Doc Type: If docs needed, set a value
Doc Text:
It was found that the original fix for CVE-2017-1000367 was incomplete. A flaw was found in the way sudo parsed tty information from the process status file in the proc filesystem. A local user with privileges to execute commands via sudo could use this flaw to escalate their privileges to root.
Clone Of:
Environment:
Last Closed: 2017-06-27 06:46:59 UTC
Embargoed:

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Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2017:1574 0 normal SHIPPED_LIVE Moderate: sudo security update 2017-06-22 23:41:18 UTC

Description Andrej Nemec 2017-06-06 12:26:45 UTC 
Todd Miller's sudo version 1.8.20p1 and earlier is vulnerable to an input validation (embedded newlines) in the get_process_ttyname() function resulting in information disclosure and command execution.
Comment 1 Andrej Nemec 2017-06-06 12:27:59 UTC 
External References:

https://www.sudo.ws/alerts/linux_tty.html
https://access.redhat.com/security/vulnerabilities/3059071
https://access.redhat.com/security/cve/CVE-2017-1000367
Comment 2 Andrej Nemec 2017-06-06 12:50:22 UTC 
*** Bug 1458425 has been marked as a duplicate of this bug. ***
Comment 3 Huzaifa S. Sidhpurwala 2017-06-07 04:44:19 UTC 
Upstream patch seems to be:

https://www.sudo.ws/repos/sudo/rev/15a46f4007dd
Comment 10 Huzaifa S. Sidhpurwala 2017-06-15 05:35:57 UTC 
Notes about exploitation:

This flaw can lead to executing commands as root, when a root terminal is open on the same machine. Since you actually need a root terminal to be open on the machine the exploit is being run, this is not a straight forward privilege escalation flaw. Therefore this is rated as having Moderate impact.
Comment 11 errata-xmlrpc 2017-06-22 19:41:44 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 5 Extended Lifecycle Support
  Red Hat Enterprise Linux 6
  Red Hat Enterprise Linux 7

Via RHSA-2017:1574 https://access.redhat.com/errata/RHSA-2017:1574
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