/[advisories]/24831.adv
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Sat May 18 11:58:31 2019 UTC (4 weeks, 3 days ago) by tmb
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MGASA-2019-0179: virtualbox-6.0.8-1.mga6, kmod-vboxadditions-6.0.8-1.mga6, kmod-virtualbox-6.0.8-1.mga6
1 type: security
2 subject: Updated virtualbox packages fix security vulnerabilities
3 CVE:
4 - CVE-2018-12126
5 - CVE-2018-12127
6 - CVE-2018-12130
7 - CVE-2019-11091
8 src:
9 6:
10 core:
11 - virtualbox-6.0.8-1.mga6
12 - kmod-vboxadditions-6.0.8-1.mga6
13 - kmod-virtualbox-6.0.8-1.mga6
14 description: |
15 This update provies Virtualbox 6.0.8 that fixes the Microarchitectural
16 Data Sampling (MDS, also called ZombieLoad attack) vulnerabilities in
17 Intel processors that can allow attackers to retrieve data being
18 processed inside a CPU.
19
20 The fixed / mitigated issues are:
21
22 Modern Intel microprocessors implement hardware-level micro-optimizations
23 to improve the performance of writing data back to CPU caches. The write
24 operation is split into STA (STore Address) and STD (STore Data)
25 sub-operations. These sub-operations allow the processor to hand-off
26 address generation logic into these sub-operations for optimized writes.
27 Both of these sub-operations write to a shared distributed processor
28 structure called the 'processor store buffer'. As a result, an
29 unprivileged attacker could use this flaw to read private data resident
30 within the CPU's processor store buffer. (CVE-2018-12126)
31
32 Microprocessors use a ‘load port’ subcomponent to perform load operations
33 from memory or IO. During a load operation, the load port receives data
34 from the memory or IO subsystem and then provides the data to the CPU
35 registers and operations in the CPU’s pipelines. Stale load operations
36 results are stored in the 'load port' table until overwritten by newer
37 operations. Certain load-port operations triggered by an attacker can be
38 used to reveal data about previous stale requests leaking data back to the
39 attacker via a timing side-channel. (CVE-2018-12127)
40
41 A flaw was found in the implementation of the "fill buffer", a mechanism
42 used by modern CPUs when a cache-miss is made on L1 CPU cache. If an
43 attacker can generate a load operation that would create a page fault,
44 the execution will continue speculatively with incorrect data from the
45 fill buffer while the data is fetched from higher level caches. This
46 response time can be measured to infer data in the fill buffer.
47 (CVE-2018-12130)
48
49 Uncacheable memory on some microprocessors utilizing speculative execution
50 may allow an authenticated user to potentially enable information disclosure
51 via a side channel with local access. (CVE-2019-11091)
52
53 For other fixes in this update, see the referenced changelog.
54 references:
55 - https://bugs.mageia.org/show_bug.cgi?id=24831
56 - https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/mds.html
57 - https://www.virtualbox.org/wiki/Changelog-6.0#v8
58 ID: MGASA-2019-0179

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