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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2005.0066 -- NGSSoftware Insight Security Research Advisory RealPlayer Arbitrary File Deletion Vulnerability 20 January 2005 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: RealPlayer 10.5 (6.0.12.1040) and prior Publisher: NGSSoftware Operating System: Windows XP Windows 2000 Windows NT Windows ME Windows 98SE Impact: Delete Arbitrary Files Access: Remote/Unauthenticated Original Bulletin: http://www.ngssoftware.com/advisories/real-02full.txt - --------------------------BEGIN INCLUDED TEXT-------------------- NGSSoftware Insight Security Research Advisory Name: RealPlayer Arbitrary File Deletion Vulnerability Systems Affected: RealPlayer 10.5 (6.0.12.1040) and older Severity: High Vendor URL: http://www.real.com/ Author: John Heasman [ john@ngssoftware.com ] Date of Public Advisory: 19th January 2004 Advisory number: #NISR19012005f Advisory URL: http://www.ngssoftware.com/advisories/real-02full.txt Reference: http://www.ngssoftware.com/advisories/real-01.txt Description *********** A vulnerability has been discovered in RealPlayer which can allow an attacker to delete arbitrary files from a users system through a specially crafted webpage with little user interaction. Details ******* RealPlayer supports a proprietary package delivery file type, aptly named Real Metadata Packages. These files contain an HTML style language which contains information and resource urls for various packages and extensions to RealPlayer. One of the supported tags within the RMP file type is the <FILENAME> tag. This is designed to point to a relative file which is to be downloaded. If the file which is to be downloaded already exists on the system, it will delete this file without warning. It is also possible to insert directory traversal character sequences in the file name to break out of the download directory, and to point to any existing file on the system. Before the the deletion takes place, RealPlayer ensures that the file extension is among those listed in the formats.ini file located at: C:\Program Files\Real\RealPlayer\DataCache\Formats\formats.ini It is possible to bypass this file extension check in the follow manner due to a lack in the file extension validation process: <FILENAME>../../../../../windows/system32/notepad.exe?.mp3</FILENAME> Fix Information *************** RealNetworks have released an update for the Real Meta Package file deletion vulnerability which can be downloaded from: http://service.real.com/help/faq/security/040928_player/EN/ A check for this vulnerability has been added to Typhon III, NGSSoftware's advanced vulnerability assessment scanner. For more information please visit the NGSSoftware website at http://www.ngssoftware.com/ About NGSSoftware ***************** NGSSoftware design, research and develop intelligent, advanced application security assessment scanners. Based in the United Kingdom, NGSSoftware have offices in the South of London and the East Coast of Scotland. NGSSoftware's sister company NGSConsulting, offers best of breed security consulting services, specialising in application, host and network security assessments. http://www.ngssoftware.com/ Telephone +44 208 401 0070 Fax +44 208 401 0076 enquiries@ngssoftware.com - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. 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. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/render.html?cid=1980 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. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQCVAwUBQe8jnCh9+71yA2DNAQIuXAP/f/IOE2RfUsrcdc9ua56Lqxo/a9r6AdGa WwykpDObrMa/u5wAlgm8b3dYll8OwWd7vykP+9mPdbsy9Fk8vlvZ24KoUOpDd+cQ XAzSgIAjoEVdGfK7J3ylPr34zIYyEwvB3md70XZTYDEt1OE3QpruTc5nnK3hxZxn rm7y3plumo4= =IBw3 -----END PGP SIGNATURE-----