Bug 397011 (CVE-2007-5962) - CVE-2007-5962 vsftpd: memory leak when deny_file option is set
Summary: CVE-2007-5962 vsftpd: memory leak when deny_file option is set
Status: CLOSED ERRATA
Alias: CVE-2007-5962
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Martin Nagy
QA Contact:
URL:
Whiteboard: source=redhat,reported=20071123,publi...
Keywords: Patch, Regression, Security
Depends On: 423001
Blocks:
TreeView+ depends on / blocked
 
Reported: 2007-11-23 15:51 UTC by Martin Nagy
Modified: 2019-06-08 12:25 UTC (History)
3 users (show)

(edit)
Clone Of:
(edit)
Last Closed: 2008-07-21 09:40:00 UTC


Attachments (Terms of Use)
fix the vsftpd-2.0.4-filter.patch (382 bytes, patch)
2007-11-23 15:51 UTC, Martin Nagy
no flags Details | Diff
Just a cosmetic change. (369 bytes, patch)
2007-11-26 11:28 UTC, Martin Nagy
no flags Details | Diff


External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2008:0295 normal SHIPPED_LIVE Low: vsftpd security and bug fix update 2008-05-21 14:16:37 UTC

Description Martin Nagy 2007-11-23 15:51:42 UTC
Description of problem:
There is a memory leak that causes memory to be allocated but not freed.
When the deny_file option is set, it is possible to easily exploit this.
This is a regression caused by applied patch in bz174764. Problem also
exists in FC-6, F-7, F-8 and fedora/devel. Attached is a patch to solve
the problem.

Version-Release number of selected component (if applicable):
vsftpd-2.0.5-10.el5

How reproducible:
always

Steps to Reproduce:
# echo deny_file=foo >> /etc/vsftpd/vsftpd.conf
# service vsftpd restart

$ cat > memtest.sh << EOF
#!/bin/bash
echo USER anonymous
echo PASS foo@bar.com

while [ 1 ]; do
        echo CWD pub
        echo CWD ..
done
EOF

$ chmod 700 memtest.sh
$ ./memtest.sh | telnet localhost 21 > /dev/null

Actual results:
vsftpd starts to allocate memory that will never be freed.

Expected results:


Additional info:
It is possible that the memory leak can be exploited by other means, or
with other vsftpd.conf options. This was not investigated into more depth.

Comment 1 Martin Nagy 2007-11-23 15:51:42 UTC
Created attachment 267651 [details]
fix the vsftpd-2.0.4-filter.patch

Comment 2 RHEL Product and Program Management 2007-11-23 16:05:19 UTC
This bugzilla has Keywords: Regression.  

Since no regressions are allowed between releases, 
it is also being proposed as a blocker for this release.  

Please resolve ASAP.

Comment 3 Martin Nagy 2007-11-26 11:28:37 UTC
Created attachment 268841 [details]
Just a cosmetic change.

Comment 4 Mark J. Cox 2007-11-27 11:36:33 UTC
moving to security response product so we can do tracking bugs for the affected
rhel streams we decide are vulnerable and need to be fixed.

Comment 9 Mark J. Cox 2008-05-21 12:51:50 UTC
removing embargo ready for 5.2 release.

Comment 10 Fedora Update System 2008-05-21 14:04:19 UTC
vsftpd-2.0.6-4.fc9 has been submitted as an update for Fedora 9

Comment 11 Fedora Update System 2008-05-21 14:05:20 UTC
vsftpd-2.0.5-20.fc8 has been submitted as an update for Fedora 8

Comment 12 Fedora Update System 2008-05-21 14:05:56 UTC
vsftpd-2.0.5-17.fc7 has been submitted as an update for Fedora 7

Comment 13 Fedora Update System 2008-05-22 20:37:20 UTC
vsftpd-2.0.5-20.fc8 has been pushed to the Fedora 8 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 14 Fedora Update System 2008-05-22 20:37:59 UTC
vsftpd-2.0.6-4.fc9 has been pushed to the Fedora 9 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 15 Fedora Update System 2008-05-22 20:38:18 UTC
vsftpd-2.0.5-17.fc7 has been pushed to the Fedora 7 stable repository.  If problems still persist, please make note of it in this bug report.


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