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Bug 678336 (CVE-2019-3812) - [TRACKER] qemu: Out-of-bounds read in hw/i2c/i2c-ddc.c allows for memory disclosure (CVE-2019-3812)
Summary: [TRACKER] qemu: Out-of-bounds read in hw/i2c/i2c-ddc.c allows for memory disc...
Status: RESOLVED FIXED
Alias: CVE-2019-3812
Product: Gentoo Security
Classification: Unclassified
Component: Vulnerabilities (show other bugs)
Hardware: All Linux
: Normal normal (vote)
Assignee: Gentoo Security
URL:
Whiteboard:
Keywords: Tracker
Depends on: 678302 678338
Blocks:
  Show dependency tree
 
Reported: 2019-02-18 21:36 UTC by Thomas Deutschmann
Modified: 2019-03-24 20:40 UTC (History)
0 users

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Runtime testing required: ---


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Description Thomas Deutschmann gentoo-dev Security 2019-02-18 21:36:55 UTC
QEMU through version 2.10 through to 3.1.0 is vulnerable to an out-of-bounds read of up to 128 bytes in the hw/i2c/i2c-ddc.c:i2c_ddc() function. A local attacker with permission to execute i2c commands could exploit this to read stack memory of the qemu process on the host.

Systems without a monitor connected are affected, a virtual monitor is presented to virtual guests.  Systems with no graphics cards attached to the virtual host are not affected.

Upstream patch:

https://github.com/qemu/qemu/commit/b05b267840515730dbf6753495d5b7bd8b04ad1c