Mageia 2019-0173: microcode security update

    Date16 May 2019
    CategoryMageia
    325
    Posted ByLinuxSecurity Advisories
    This update provides the Intel 20190514 microcode release that adds the microcode side mitigations for the Microarchitectural Data Sampling (MDS, also called ZombieLoad attack) vulnerabilities in Intel processors that can allow attackers to retrieve data being processed inside a CPU.
    MGASA-2019-0173 - Updated microcode packages fix security vulnerabilities
    
    Publication date: 16 May 2019
    URL: https://advisories.mageia.org/MGASA-2019-0173.html
    Type: security
    Affected Mageia releases: 6
    CVE: CVE-2018-12126,
         CVE-2018-12127,
         CVE-2018-12130,
         CVE-2019-11091
    
    This update provides the Intel 20190514 microcode release that adds the
    microcode side mitigations for the Microarchitectural Data Sampling (MDS,
    also called ZombieLoad attack) vulnerabilities in Intel processors that
    can allow attackers to retrieve data being processed inside a CPU.
    
    The fixed / mitigated issues are:
    
    Modern Intel microprocessors implement hardware-level micro-optimizations
    to improve the performance of writing data back to CPU caches. The write
    operation is split into STA (STore Address) and STD (STore Data)
    sub-operations. These sub-operations allow the processor to hand-off
    address generation logic into these sub-operations for optimized writes.
    Both of these sub-operations write to a shared distributed processor
    structure called the 'processor store buffer'. As a result, an
    unprivileged attacker could use this flaw to read private data resident
    within the CPU's processor store buffer. (CVE-2018-12126)
    
    Microprocessors use a ‘load port’ subcomponent to perform load operations
    from memory or IO. During a load operation, the load port receives data
    from the memory or IO subsystem and then provides the data to the CPU
    registers and operations in the CPU’s pipelines. Stale load operations
    results are stored in the 'load port' table until overwritten by newer
    operations. Certain load-port operations triggered by an attacker can be
    used to reveal data about previous stale requests leaking data back to the
    attacker via a timing side-channel. (CVE-2018-12127)
    
    A flaw was found in the implementation of the "fill buffer", a mechanism
    used by modern CPUs when a cache-miss is made on L1 CPU cache. If an
    attacker can generate a load operation that would create a page fault,
    the execution will continue speculatively with incorrect data from the
    fill buffer while the data is fetched from higher level caches. This
    response time can be measured to infer data in the fill buffer.
    (CVE-2018-12130)
    
    Uncacheable memory on some microprocessors utilizing speculative execution
    may allow an authenticated user to potentially enable information disclosure
    via a side channel with local access. (CVE-2019-11091) 
    
    References:
    - https://bugs.mageia.org/show_bug.cgi?id=24800
    - https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/mds.html
    - https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-12126
    - https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-12127
    - https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-12130
    - https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11091
    
    SRPMS:
    - 6/nonfree/microcode-0.20190514-1.mga6.nonfree
    

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