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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2018.1552.4 K17403481: Linux kernel vulnerability CVE-2018-8897 2 November 2018 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: F5 products Publisher: F5 Networks Operating System: Network Appliance Impact/Access: Denial of Service -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2018-8897 Reference: ASB-2018.0107 ESB-2018.1494 ESB-2018.1492 ESB-2018.1458 Original Bulletin: https://support.f5.com/csp/article/K17403481 Revision History: November 2 2018: Additional fixes provided for BIG-IP products October 24 2018: Additional fixes introduced for BIG-IP products September 21 2018: A patch has been developed for BIG-IP Products 12.x May 22 2018: Initial Release - --------------------------BEGIN INCLUDED TEXT-------------------- K17403481: Linux kernel vulnerability CVE-2018-8897 Security Advisory Original Publication Date: May 15, 2018 Updated Date: Nov 02, 2018 Security Advisory Description A statement in the System Programming Guide of the Intel 64 and IA-32 Architectures Software Developer's Manual (SDM) was mishandled in the development of some or all operating-system kernels, resulting in unexpected behavior for #DB exceptions that are deferred by MOV SS or POP SS, as demonstrated by (for example) privilege escalation in Windows, macOS, some Xen configurations, or FreeBSD, or a Linux kernel crash. The MOV to SS and POP SS instructions inhibit interrupts (including NMIs), data breakpoints, and single step trap exceptions until the instruction boundary following the next instruction (SDM Vol. 3A; section 6.8.3). (The inhibited data breakpoints are those on memory accessed by the MOV to SS or POP to SS instruction itself.) Note that debug exceptions are not inhibited by the interrupt enable (EFLAGS.IF) system flag (SDM Vol. 3A; section 2.3). If the instruction following the MOV to SS or POP to SS instruction is an instruction like SYSCALL, SYSENTER, INT 3, etc. that transfers control to the operating system at CPL < 3, the debug exception is delivered after the transfer to CPL < 3 is complete. OS kernels may not expect this order of events and may therefore experience unexpected behavior when it occurs. (CVE-2018-8897) Impact This vulnerability allows for a disruption of service. Security Advisory Status F5 Product Development has assigned ID 719554 (BIG-IP), ID 719747 (BIG-IQ and F5 iWorkflow), and ID 719744 (Enterprise Manager) to this vulnerability. Additionally, BIG-IP iHealth may list Heuristic H17403481 on the Diagnostics > Identified > Medium page. To determine if your product and version have been evaluated for this vulnerability, refer to the Applies to (see versions) box. To determine if your release is known to be vulnerable, the components or features that are affected by the vulnerability, and for information about releases or hotfixes that address the vulnerability, refer to the following table. +-------------------+------+----------+----------+----------+------+----------+ | | |Versions |Fixes | |CVSSv3|Vulnerable| |Product |Branch|known to |introduced|Severity |score^|component | | | |be |in | |1 |or feature| | | |vulnerable| | | | | +-------------------+------+----------+----------+----------+------+----------+ | |14.x |14.0.0 |14.0.0.3 | | | | |BIG-IP (LTM, AAM, +------+----------+----------+ | | | |AFM, Analytics, |13.x |13.0.0 - |13.1.1.2 | | | | |APM, ASM, DNS, Edge| |13.1.1 | | | | | |Gateway, FPS, GTM, +------+----------+----------+Medium |6.5 |Linux | |Link Controller, |12.x |12.1.0 - |12.1.3.7 | | |kernel | |PEM, | |12.1.3 | | | | | |WebAccelerator) +------+----------+----------+ | | | | |11.x |11.2.1 - |11.6.3.3 | | | | | | |11.6.3 | | | | | +-------------------+------+----------+----------+----------+------+----------+ |ARX |6.x |None |Not |Not |None |None | | | | |applicable|vulnerable| | | +-------------------+------+----------+----------+----------+------+----------+ |Enterprise Manager |3.x |3.1.1 |None |Medium |6.5 |Linux | | | | | | | |kernel | +-------------------+------+----------+----------+----------+------+----------+ | |6.x |6.0.0 - |None | | | | | | |6.0.1 | | | | | |BIG-IQ Centralized +------+----------+----------+ | |Linux | |Management |5.x |5.0.0 - |None |Medium |6.5 |kernel | | | |5.4.0 | | | | | | +------+----------+----------+ | | | | |4.x |4.6.0 |None | | | | +-------------------+------+----------+----------+----------+------+----------+ |BIG-IQ Cloud and |1.x |1.0.0 |None |Medium |6.5 |Linux | |Orchestration | | | | | |kernel | +-------------------+------+----------+----------+----------+------+----------+ |F5 iWorkflow |2.x |2.0.2 - |None |Medium |6.5 |Linux | | | |2.3.0 | | | |kernel | +-------------------+------+----------+----------+----------+------+----------+ |LineRate |2.x |None |Not |Not |None |None | | | | |applicable|vulnerable| | | +-------------------+------+----------+----------+----------+------+----------+ | |5.x |5.0.0 - |None | | | | |Traffix SDC | |5.1.0 | |Medium |6.5 |Linux | | +------+----------+----------+ | |kernel | | |4.x |4.4.0 |None | | | | +-------------------+------+----------+----------+----------+------+----------+ ^1 The CVSSv3 score link takes you to a resource outside of AskF5, and it is possible that the document may be removed without our knowledge. Security Advisory Recommended Actions If you are running a version listed in the Versions known to be vulnerable column, you can eliminate this vulnerability by upgrading to a version listed in the Fixes introduced in column. If the table lists only an older version than what you are currently running, or does not list a non-vulnerable version, then no upgrade candidate currently exists. Mitigation None Supplemental Information o K51812227: Understanding Security Advisory versioning o K41942608: Overview of Security Advisory articles o K4602: Overview of the F5 security vulnerability response policy o K4918: Overview of the F5 critical issue hotfix policy 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 - --------------------------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. 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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 iQIVAwUBW9vWF2aOgq3Tt24GAQhf3xAAmNni1+H5V5L/QHgybgHuHkkpuieY9Cck skMWZSR6nPY9+gGxTs/uFTfLlqCGscIhruCDvCuQvk00LAl1cC0R38T1Xipymh8h PhQS/aGpQcbbCvPXTJF+jz72H1RDcKJzYpHfRgW8sN7Jt0MppgGQ/RSkGFi1dLO5 bp++XspoAoTN9GOU5pTrIHGaf8LKbltCfgxKxUS/N+NHXx3VdrtkFhpWyBVwSGhr PaUV3+RhpfGnzVRjwglGRQEijSzBglBHw/9wIc94uigYO00G2SSxH4YCuCGCjX5U aSU4sSLfV0utaiIIdaQKsFL3JQIuXnq4i/L6eshDfa+J38SAQmf9MmMOXWsxUYdR K1b6v1nZNapwvmDbExeTZmiL8aiXtPZBqHLOBbVU5saQIo4qzsvsKtArTscDqc7C XVf/tZlMKMfU/7ZE5R89Bmd0mSGv0RgjbdY3cL/3i0w5kpmD1q8qiw8Z7A+mo3Hh SOmK4ToeCsTNTfvfKTfUc0BD0JpN1Ej0q+EL4HDxk4tkwnSEW1EPins2VPQSqEsi hgVz3UEH5Zf94ZkqnOpkyGgA2QBQ2jxp6d5s7IZrGc3UPaJJ0L/rbaEY30jNhsoC Ym2hvoDTgif7t2dtGK86R9POwNjI1iO6smI1yvCVT62SB58bg1X8GWS5eRRr+l2E kG5NsMtAzgk= =YpGO -----END PGP SIGNATURE-----