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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
        ---------------------------------

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

===========================================================================
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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