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AUSCERT Security Bulletin
ASB-2009.1027
ZNC: Directory Traversal Vulnerability
23 July 2009
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AusCERT Security Bulletin Summary
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Product: ZNC
Operating System: UNIX variants (UNIX, Linux, OSX)
Impact/Access: Unauthorised Access -- Existing Account
Create Arbitrary Files -- Existing Account
Resolution: Upgrade
Member content until: Saturday, August 22 2009
OVERVIEW
A vulnerability has been reported in ZNC that can allow an attacker
to conduct directory traversal attacks with write capabilities.
IMPACT
The vendor has provided the following information regarding this
vulnerability:
"Fix a high-impact directory traversal bug
You can upload files to znc via /dcc send *status. The files will
be saved in <datadir>/users/<user>/downloads/. The code for this
didn't do any checking on the file name at all and thus allowed
directory traversal attacks by all znc users (no admin privileges
required!).
By exploiting this bug, attackers could e.g. upload a new ssh
authorized_keys file or upload a znc module which lets everyone
gain shell access. Anything is possible." [1]
MITIGATION
ZNC have released version 0.072 which they confirm corrects this
vulnerability. [2]
The new release is available for download from the vendor's
website. [3]
REFERENCES
[1] SourceForge.net Repository - [znc] Revision 1570
http://znc.svn.sourceforge.net/viewvc/znc?view=rev&sortby=rev&sortdir=down&revision=1570
[2] ChangeLog/0.072 - ZNC
http://en.znc.in/wiki/ChangeLog/0.072
[3] ZNC - Advanced IRC Bouncer
http://sourceforge.net/projects/znc/files/
AusCERT has made every effort to ensure that the information contained
in this document is accurate. However, the decision to use the information
described is the responsibility of each user or organisation. The decision to
follow or act on information or advice contained in this security bulletin is
the responsibility of each user or organisation, and should be considered in
accordance with your organisation's site policies and procedures. AusCERT
takes no responsibility for consequences which may arise from following or
acting on information or advice contained in this security bulletin.
If you believe that your computer system has been compromised or attacked in
any way, we encourage you to let us know by completing the secure National IT
Incident Reporting Form at:
http://www.auscert.org.au/render.html?it=3192
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Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
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