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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2015.2372 Cisco Email Security Appliance Format String Vulnerability 10 September 2015 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Cisco Email Security Appliance Publisher: Cisco Systems Operating System: Cisco Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Mitigation CVE Names: CVE-2015-6285 Original Bulletin: http://tools.cisco.com/security/center/viewAlert.x?alertId=40844 - --------------------------BEGIN INCLUDED TEXT-------------------- Vulnerability Alert Cisco Email Security Appliance Format String Vulnerability Threat Type: CWE-134: Format String Vulnerability IntelliShield ID: 40844 Version: 1 First Published: 2015 September 09 18:02 GMT Last Published: 2015 September 09 18:02 GMT Port: Not available CVE: CVE-2015-6285 Urgency: Unlikely Use Credibility: Confirmed Severity: Mild Damage CVSS Base: 5.8 CVSS Temporal: 5.5 Version Summary: Cisco Email Security Appliance contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition on the affected device. Updates are not available. Description The Cisco Email Security Appliance (ESA) contains a vulnerability that could allow an unauthenticated, remote attacker to impact the integrity and availability of services and data on the affected device. The impact includes a partial denial of service (DoS). In addition, the attacker could override part of the memory of the affected device. The vulnerability is due to improper validation of string input in the web application. An attacker could exploit this vulnerability by sending a crafted HTTP request to the affected device. A successful exploit could allow the attacker to impact the integrity and availability of services and data of the device, including a partial DoS condition. Cisco has confirmed the vulnerability; however, software updates are not available. Warning Indicators At the time this alert was first published, Cisco Email Security Appliance versions 7.6.0 and 8.0.0 were affected. Later versions of Cisco ESA may also be affected. IntelliShield Analysis To exploit the vulnerability, the attacker would need to send crafted HTTP requests to the targeted system through the web application. Because the attacker does not need to authenticate to send the crafted request, the likelihood of a DoS condition or partial memory override is increased. Cisco indicates through the CVSS score that functional exploit code exists; however, the code is not known to be publicly available. Vendor Announcements Cisco has released bug ID CSCug21497 for registered users, which contains additional details and an up-to-date list of affected product versions. Impact An unauthenticated, remote attacker could exploit this vulnerability to cause a DoS condition or partial memory override on the affected device. Technical Information The vulnerability is due to improper validation of string input in the web application. An attacker could exploit this vulnerability by sending crafted HTTP requests to the targeted device. Processing such requests could allow the unauthenticated, remote attacker to cause a DoS condition or partial memory override on the targeted device. Safeguards Administrators are advised to contact the vendor regarding future updates and releases. Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems. Administrators are advised to monitor affected systems. Patches/Software Updates are not available. Alert History Initial Release Product Sets The security vulnerability applies to the following combinations of products. Primary Products: Cisco Cisco Email Security Appliance (ESA) 7.6 .0 | 8.0 Base Associated Products: N/A LEGAL DISCLAIMER The urgency and severity ratings of this alert are not tailored to individual users; users may value alerts differently based upon their network configurations and circumstances. THE ALERT, AND INFORMATION CONTAINED THEREIN, ARE PROVIDED ON AN "AS IS" BASIS AND DO NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE ALERT, AND INFORMATION CONTAINED THEREIN, OR MATERIALS LINKED FROM THE ALERT, IS AT YOUR OWN RISK. INFORMATION IN THIS ALERT AND ANY RELATED COMMUNICATIONS IS BASED ON OUR KNOWLEDGE AT THE TIME OF PUBLICATION AND IS SUBJECT TO CHANGE WITHOUT NOTICE. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE ALERTS AT ANY TIME. - --------------------------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 =========================================================================== 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 iQIVAwUBVfDLen6ZAP0PgtI9AQIt6A//X382fRjmJFUmSR3fxMH2mhzzQtS7rglw 7nRWJvXQOScS8BywvU3Ncw5NmMW4haqXGbiyaSgnnAVJCVubzcF6yIg9R3v7eYnk mNozuoDcZ4Fb9k+ACSmpFXE9U6AmY5TTB5SrvXtkZhvBdsDSbn/8tLDsm0W8VjqV LQQwFtM8/D4Ff9d9XrE3gYC68b7k/ebUfMOSNvyLI28W0Sfrp8F+5FJ3ZgliH/mA 4r0+VfyU/J7vQbeHOjGiGHsAS2cK/1gVF0GLJyMu3kVIq9iSSyZAr8Gu3cUuNGVz 88lOENW+Xxb5JFHVVn4wDC5eZi3PPUI/o3Ym9W0Ffy3KKMD9LGErTsNc9HOlET1V e0386XEvX7th20U3aydGB6xpxSxF6+nN8m+N6lft/fFr1hXogMs4l6cEWui2lDZX UoW/vVHFDsijs9lf0HDVvy4NUgVtduPs7IkuE1FLqyVTG4AEOHNG2OvDpHNCtuG7 lkPitBVQKyAttdfVXf0bF7vyrWrJHreZeU9e1xgpykWnMt2/+LnpsQCyg233Q7Pw DineGcrRPvsiGizFNxx4UMwldGCH3z92BZNEB8pWrj1IamW3PRm7bqG84IYhIFq9 YQrQUY5jxM2tdqxndA2DutZaNGaMJlD978ALTDfNL2PS+EHo76uII8YaMKwFoX3z fY3yQjbbHtg= =aRC2 -----END PGP SIGNATURE-----