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Bug 248059 - CVE-2007-3102 audit logging of failed logins
CVE-2007-3102 audit logging of failed logins
Product: Red Hat Enterprise Linux 5
Classification: Red Hat
Component: openssh (Show other bugs)
All Linux
low Severity low
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Assigned To: Tomas Mraz
Brian Brock
: Security
Depends On:
  Show dependency treegraph
Reported: 2007-07-12 17:03 EDT by Tomas Mraz
Modified: 2007-11-30 17:07 EST (History)
3 users (show)

See Also:
Fixed In Version: RHSA-2007-0540
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
Last Closed: 2007-11-07 10:32:46 EST
Type: ---
Regression: ---
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Documentation: ---
Verified Versions:
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Attachments (Terms of Use)

External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2007:0540 normal SHIPPED_LIVE Moderate: openssh security and bug fix update 2007-11-07 11:19:19 EST

  None (edit)
Description Tomas Mraz 2007-07-12 17:03:30 EDT
+++ This bug was initially created as a clone of Bug #247797 +++

Description of problem:
The logging of failed logins can be used to inject bad information into audit
logs. Example:

ssh -l "fakeuser auid=1234 tty=pty1 host=" victim


type=USER_AUTH msg=audit(06/07/2007 11:04:14.429:101) : user pid=8151 uid=root
auid=unset subj=system_u:system_r:sshd_t:s0-s0:c0.c1023 msg='PAM: authentication
acct=fakeuser auid=unknown(1234) tty=pty1 host= : exe=/usr/sbin/sshd
(hostname=discovery.redhat.com, addr=, terminal=ssh res=failed)'

Version-Release number of selected component (if applicable):
all recent versions

-- Additional comment from sgrubb@redhat.com on 2007-06-08 15:10 EST --
ssh -l "fakeuser auid=1234 terminal=pty1 hostname=" victim

Is a better test case. Using it, you can subvert ausearch and aureport when they
search or report on tty or hostname. This is important in that some people could
construct protective measures based on the audit log information and wind up
suspecting the wrong host. Its easy to image this become a DoS vector. And it
would possibly make people lose confidence in audit system.

-- Additional comment from mjc@redhat.com on 2007-06-15 09:19 EST --
This issue has security implications as a third party may rely on parsing the
audit logs (like a IDS/IPS system) and this false information may be able to
fool it. allocated CVE-2007-3102

The openssh package also creates USER_LOGIN audit records which have the same
log injection problem. The user name must be escaped in these audit records as well.
Comment 1 Steve Grubb 2007-07-12 17:09:29 EDT
This should be fixed as it can mislead the audit system and any analytical tools
reading the events.
Comment 7 Mark J. Cox 2007-11-07 09:19:21 EST
removing embargo
Comment 8 errata-xmlrpc 2007-11-07 10:32:46 EST
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on the solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.


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