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Bug 1453074 (CVE-2017-1000367) - CVE-2017-1000367 sudo: Privilege escalation in via improper get_process_ttyname() parsing
Summary: CVE-2017-1000367 sudo: Privilege escalation in via improper get_process_ttyna...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2017-1000367
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1455198 1455399 1455400 1455401 1455402 1456237 1456884
Blocks:
TreeView+ depends on / blocked
 
Reported: 2017-05-22 05:54 UTC by Huzaifa S. Sidhpurwala
Modified: 2021-02-17 02:07 UTC (History)
15 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
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: 2019-06-08 03:13:12 UTC
Embargoed:

Attachments (Terms of Use)
sudo patch (deleted)
2017-05-25 03:40 UTC, Huzaifa S. Sidhpurwala 		no flags Details | Diff
proposed rhel-7.3.z patch (deleted)
2017-05-25 08:29 UTC, Jakub Jelen 		no flags Details
Isolated reproducer with commented out old code (copied code from sudo-1.8.6) (deleted)
2017-05-25 08:49 UTC, Jakub Jelen 		no flags Details
View All


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2017:1381 0 normal SHIPPED_LIVE Important: sudo security update 2017-05-30 21:02:16 UTC
Red Hat Product Errata RHSA-2017:1382 0 normal SHIPPED_LIVE Important: sudo security update 2017-05-30 23:33:40 UTC

Description Huzaifa S. Sidhpurwala 2017-05-22 05:54:32 UTC 
A flaw was found in the way sudo read the device number of the tty from field 7 (tty_nr) from "/proc/[pid]/stat". A local attacker could use this flaw to escalate his privilege to root.
Comment 1 Huzaifa S. Sidhpurwala 2017-05-22 05:54:36 UTC 
Acknowledgments:

Name: Qualys Security
Comment 6 Huzaifa S. Sidhpurwala 2017-05-25 03:40:10 UTC 
Created attachment 1282109 [details]
sudo patch
Comment 9 Jakub Jelen 2017-05-25 08:29:05 UTC 
Created attachment 1282148 [details]
proposed rhel-7.3.z patch
Comment 10 Jakub Jelen 2017-05-25 08:49:50 UTC 
Created attachment 1282158 [details]
Isolated reproducer with commented out old code (copied code from sudo-1.8.6)

The same patch applies to rhel-6.10 and rhel-6.9.
Comment 13 Andrej Nemec 2017-05-30 15:31:20 UTC 
Created sudo tracking bugs for this issue:

Affects: fedora-all [bug 1456884]
Comment 14 Andrej Nemec 2017-05-30 15:34:07 UTC 
External References:

https://www.sudo.ws/alerts/linux_tty.html
https://access.redhat.com/security/vulnerabilities/3059071
Comment 15 Andrej Nemec 2017-05-30 15:36:00 UTC 
References:

http://seclists.org/oss-sec/2017/q2/358
Comment 16 errata-xmlrpc 2017-05-30 17:06:21 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 5 Extended Lifecycle Support

Via RHSA-2017:1381 https://access.redhat.com/errata/RHSA-2017:1381
Comment 18 errata-xmlrpc 2017-05-30 19:34:07 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7
  Red Hat Enterprise Linux 6

Via RHSA-2017:1382 https://access.redhat.com/errata/RHSA-2017:1382
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