Bug 892983 (CVE-2013-0160) - CVE-2013-0160 kernel: /dev/ptmx to measure inter-keystroke timing
Summary: CVE-2013-0160 kernel: /dev/ptmx to measure inter-keystroke timing
Status: CLOSED WONTFIX
Alias: CVE-2013-0160
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: impact=low,public=20130107,reported=2...
Keywords: Security
Depends On:
Blocks: 892984
TreeView+ depends on / blocked
 
Reported: 2013-01-08 11:11 UTC by Jan Lieskovsky
Modified: 2019-06-08 19:22 UTC (History)
23 users (show)

(edit)
Clone Of:
(edit)
Last Closed: 2014-11-21 10:34:47 UTC


Attachments (Terms of Use)
Local copy of the reproducer to determine keystroke latency (1.66 KB, text/plain)
2013-01-08 11:13 UTC, Jan Lieskovsky
no flags Details
Local copy of a reproducer to determine password length for "su -" session (1.45 KB, text/plain)
2013-01-08 11:13 UTC, Jan Lieskovsky
no flags Details

Description Jan Lieskovsky 2013-01-08 11:11:02 UTC
A security flaw was found in the way "/dev/ptmx", a character device used to create a pseudo-terminal master (PTM) and slave (PTS) pair, of the Linux kernel, used to transmit data through the PTM when a keystroke was pressed. An unprivileged, local user could use this flaw to determine inter-keystroke timing (measure latency between keystrokes), possibly allowing them to determine effective length of an password being typed in.

References:
[1] http://vladz.devzero.fr/013_ptmx-timing.php
[2] http://users.ece.cmu.edu/~dawnsong/papers/ssh-timing.pdf
[3] http://www.openwall.com/lists/oss-security/2013/01/07/5
[4] https://bugzilla.novell.com/show_bug.cgi?id=797175

Reproducers:
[5] http://vladz.devzero.fr/svn/codes/PoC/ptmx-keystroke-latency.c
    (to display latency between keystrokes)
[6] http://vladz.devzero.fr/svn/codes/PoC/ptmx-su-pwdlen.sh
    (to determine password length)


This issue was found by researcher with nickname vladz.

Comment 1 Jan Lieskovsky 2013-01-08 11:13:02 UTC
Created attachment 674721 [details]
Local copy of the reproducer to determine keystroke latency

Comment 2 Jan Lieskovsky 2013-01-08 11:13:57 UTC
Created attachment 674722 [details]
Local copy of a reproducer to determine password length for "su -" session

Comment 3 Martin Prpič 2014-11-21 10:34:47 UTC
Statement:

This issue affects the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 5 and 6, and Red Hat Enterprise MRG 2. Red Hat Product Security has rated this issue as having Low security impact. This issue is not currently planned to be addressed in future updates. For additional information, refer to the Issue Severity Classification: https://access.redhat.com/security/updates/classification/


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