Bug 1629975 (CVE-2018-16744) - CVE-2018-16744 mgetty: Command injection in faxrec.c
Summary: CVE-2018-16744 mgetty: Command injection in faxrec.c
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2018-16744
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1629976 1631238
Blocks: 1629987
TreeView+ depends on / blocked
 
Reported: 2018-09-17 17:39 UTC by Pedro Sampaio
Modified: 2023-03-24 14:14 UTC (History)
8 users (show)

Fixed In Version: mgetty 1.2.1
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Clone Of:
Environment:
Last Closed: 2021-10-25 22:17:41 UTC
Embargoed:

Attachments (Terms of Use)
upstream patch (501 bytes, patch)
2018-09-20 09:29 UTC, Riccardo Schirone 		no flags Details | Diff
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Description Pedro Sampaio 2018-09-17 17:39:45 UTC 
An issue was discovered in mgetty before 1.2.1. In fax_notify_mail() in faxrec.c, the mail_to parameter is not sanitized. It could allow for command injection if untrusted input can reach it, because popen is used.

References:

https://www.x41-dsec.de/lab/advisories/x41-2018-007-mgetty
Comment 1 Pedro Sampaio 2018-09-17 17:40:16 UTC 
Created mgetty tracking bugs for this issue:

Affects: fedora-all [bug 1629976]
Comment 2 Riccardo Schirone 2018-09-20 09:19:30 UTC 
Only root can write to /etc/mgetty+sendfax/mgetty.config and set the `notify` option which `mail_to` is set to when the program runs.
Comment 5 Riccardo Schirone 2018-09-20 09:29:50 UTC 
Created attachment 1485085 [details]
upstream patch

This patch was extracted from mgetty-1.2.1
Comment 6 Riccardo Schirone 2018-09-20 09:32:42 UTC 
This flaw is very unlikely to be exploited since it requires the root account to set a wrong `notify` option.
Comment 8 Riccardo Schirone 2018-09-20 09:37:42 UTC 
Mitigation:

Make sure the `notify` option in /etc/mgetty+sendfax/mgetty.config does not contain characters that can be possibly interpreted by the shell and that the file is readable and writable only by root.
Comment 9 Fedora Update System 2019-02-27 01:15:28 UTC 
mgetty-1.1.37-10.fc28 has been pushed to the Fedora 28 stable repository. If problems still persist, please make note of it in this bug report.
Comment 10 Fedora Update System 2019-02-27 03:28:18 UTC 
mgetty-1.1.37-11.fc29 has been pushed to the Fedora 29 stable repository. If problems still persist, please make note of it in this bug report.
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