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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2019.0948.2 The BIG-IP SMTPS virtual server may fail to properly restrict I/O buffering, allowing attackers to insert commands into encrypted SMTP sessions 25 March 2019 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: F5 BIG-IP products Publisher: F5 Networks Operating System: Network Appliance Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated Resolution: Patch/Upgrade Original Bulletin: https://support.f5.com/csp/article/K23284054 Revision History: March 25 2019: Updated to include latest revision March 22 2019: Initial Release - --------------------------BEGIN INCLUDED TEXT-------------------- K23284054:The BIG-IP SMTPS virtual server may fail to properly restrict I/O buffering, allowing attackers to insert commands into encrypted SMTP sessions Security Advisory Original Publication Date: 22 Mar, 2019 Latest Publication Date: 23 Mar, 2019 Security Advisory Description This issue occurs the following condition is met: o A virtual server is configured with a Client SSL profile and an SMTPS profile that has the STARTTLS Activation Mode setting enabled (Allow or Require) for processing SMTPS traffic. Impact When system receives these SMTP commands are received as a group, the affected SMTPS virtual server improperly processes the SMTP commands after the STARTTLS command. As a result, an attacker may be able to inject commands into the encrypted session. Per RFC3207, if an SMTP client uses command pipelining, the STARTTLS command must be the last command in the group. Symptoms As a result of this issue, you may encounter the following symptom: o When the STARTTLS command and SMTP commands are sent in a group, the system accepts and processes the SMTP commands while still waiting for the client to start the Transport Layer Security (TLS) negotiation. Security Advisory Status F5 Product Development has assigned ID 610138 to this issue. F5 has confirmed that this issue exists in the products listed in the Applies to (see versions) box, located in the upper-right corner of this article. For information about releases, point releases, or hotfixes that resolve this issue, refer to the following table. +------------------+------------------+---------------------------------------+ |Type of fix |Fixes introduced |Related articles | | |in | | +------------------+------------------+---------------------------------------+ | |13.1.0 | | |Release |12.1.4 |K2200: Most recent versions of F5 | | |11.6.4 |software | | |11.5.9 | | +------------------+------------------+---------------------------------------+ |Point release/ |None |None | |hotfix | | | +------------------+------------------+---------------------------------------+ Security Advisory Recommended Actions Workaround None Supplemental Information o K51812227: Understanding Security Advisory versioning o K41942608: Overview of AskF5 Security Advisory articles o K4602: Overview of the F5 security vulnerability response policy o K4918: Overview of the F5 critical issue hotfix policy o K9502: BIG-IP hotfix and point release matrix o K13123: Managing BIG-IP product hotfixes (11.x - 13.x) o K167: Downloading software and firmware from F5 o K9970: Subscribing to email notifications regarding F5 products o K9957: Creating a custom RSS feed to view new and updated documents o RFC3207: SMTP Service Extension for Secure SMTP over Transport Layer Security Note: This link takes you to a resource outside of AskF5, and it is possible that the document may be removed without our knowledge. - --------------------------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: https://www.auscert.org.au/bulletins/ =========================================================================== 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 iQIVAwUBXJhoE2aOgq3Tt24GAQjyJg/+Ou8Yww8cJ083MZv5jy5hf2/2QA1saXks OxEORFpUvB9fMoZiAVTBTZeBtNDJjg1g069W7oIauJSB6BcoL2G+MgRVX7fJflUc RBJw2EFXcKHZLW5RDvS45SVs+Sze5krW+UxU7hKp0YWBRibtnK4DDyCAXmKXd1Ra 5BIw5bueyhlIlMppRWLH83ZWkveCT+MPlH83yn+gA0o6Mke9JzB7SI8XlX7H2HBA q/yrudEQZKpI+2I1AzNF4nrLeOtk/0K23E+WI2V/IgDIeS50CWj1KbQMvI+kve14 9ISPHj8AqNfSQBdtG9aRS/NPmUn5HDll2qTvtk+tvRRbQNPQY1WsahjWUaKSaTfI wpqGtaTREjjvmFU5gOI6g087ot8MzOftgTKFZZkubLg6tVtTqVcZhNTO7taMhYY2 moW9JS/1q10DW+Hk6a+yO+kIxypdTvROcaOzhW4uzmqa1k3ptwfaQx6Gfly34jsl /I+rx1b2jmu1Uov8SSrt7A7bgASo7tW7dEnyz+DWEpU2Dar5JmI2OEPmbPfuvnf3 VZgL1YEee5TgYN9m/Tn2MBK5NJSTpcnp0aJahFowGU6f8vP5sGdSW4YIunpyOe8I hWidSJGEJP7kX7A9qgifGc2qs2x6CyJ3ve7Z2gLaF+hvBdBV11z7WeERG+xVNgd5 MBJLlMAsf1w= =MxYK -----END PGP SIGNATURE-----