Bug 1575466 (CVE-2018-1122) - CVE-2018-1122 procps-ng, procps: Local privilege escalation in top
Summary: CVE-2018-1122 procps-ng, procps: Local privilege escalation in top
Keywords:
Status: CLOSED WONTFIX
Alias: CVE-2018-1122
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:
Depends On: 1577023 1577024 1579639 1579640
Blocks: 1575455
TreeView+ depends on / blocked
 
Reported: 2018-05-07 02:01 UTC by Doran Moppert
Modified: 2019-09-29 14:38 UTC (History)
6 users (show)

Fixed In Version: procps-ng 3.3.15
Doc Type: If docs needed, set a value
Doc Text:
If the HOME environment variable is unset or empty, top will read its configuration file from the current working directory without any security check. If a user runs top with HOME unset in an attacker-controlled directory, the attacker could achieve privilege escalation by exploiting one of several vulnerabilities in the config_file() function.
Clone Of:
Environment:
Last Closed: 2019-06-10 10:21:20 UTC


Attachments (Terms of Use)


Links
System ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2019:2189 None None None 2019-08-06 12:26:03 UTC

Description Doran Moppert 2018-05-07 02:01:52 UTC
If the HOME environment variable is unset or empty, top will read its configuration file from the current working directory without any security check.  If a user runs top with HOME unset in an attacker-controlled directory, the attacker could acieve privilege escalation by exploiting one of several vulnerabilities in the config_file() function.

Comment 6 Adam Mariš 2018-05-16 11:17:05 UTC
Acknowledgments:

Name: Qualys Research Labs

Comment 7 Doran Moppert 2018-05-18 05:13:46 UTC
Public via: http://seclists.org/oss-sec/2018/q2/122

Comment 8 Doran Moppert 2018-05-18 05:13:52 UTC
External References:

https://www.qualys.com/2018/05/17/procps-ng-audit-report-advisory.txt

Comment 9 Doran Moppert 2018-05-18 05:14:16 UTC
Created procps-ng tracking bugs for this issue:

Affects: fedora-all [bug 1579639]

Comment 11 Doran Moppert 2018-12-12 02:54:13 UTC
CVSSv3 scoring has been reviewed.  Changed the AC (Attack Complexity) metric from Low to High, as exploiting this flaw relies on the target user running `top` with an unset or empty `HOME` environment variable and in a directory controlled by the attacker.  This is unusual, and certainly beyond the attacker's control.

Note that our score differs from NVD in one respect:  User Interaction: None (NVD) vs Required (Red Hat).  Exploitation requires the target user to run `top` in an attacker-controlled directory.  `top` is an interactive tool:  while it does support a batch mode that might be used from a script, the extra conditions for exploitation are extremely unlikely to be met by a script that is run unattended.  We regard plausible attack scenarios using this flaw to target a user that is interactively running `top`.

Comment 12 errata-xmlrpc 2019-08-06 12:26:02 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2019:2189 https://access.redhat.com/errata/RHSA-2019:2189


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