Bug 1549798 (CVE-2018-7550) - CVE-2018-7550 QEMU: i386: multiboot OOB access while loading kernel image
Summary: CVE-2018-7550 QEMU: i386: multiboot OOB access while loading kernel image
Status: NEW
Alias: CVE-2018-7550
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard: impact=moderate,public=20180227,repor...
Keywords: Security
Depends On: 1549803 1549799 1549802 1549820 1549821 1549822 1549823 1549824 1549825 1549826 1549827 1549828 1549829 1549926 1549927
Blocks: 1547556
TreeView+ depends on / blocked
 
Reported: 2018-02-27 20:35 UTC by Prasad J Pandit
Modified: 2019-05-16 08:11 UTC (History)
41 users (show)

(edit)
Quick Emulator (QEMU), compiled with the PC System Emulator with multiboot feature support, is vulnerable to an OOB r/w memory access issue. The issue could occur while loading a kernel image during the guest boot, if mh_load_end_addr address is greater than the mh_bss_end_addr address. A user or process could use this flaw to potentially achieve arbitrary code execution on a host.
Clone Of:
(edit)
Last Closed:


Attachments (Terms of Use)


External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2018:1369 None None None 2018-05-10 16:05 UTC
Red Hat Product Errata RHSA-2018:2462 None None None 2018-08-16 14:17 UTC

Description Prasad J Pandit 2018-02-27 20:35:19 UTC
Quick Emulator(QEMU) built with the PC System Emulator with multiboot feature
support is vulnerable to an OOB memory access issue. It could occur while
loading a kernel image during a guest boot if multiboot head addresses
mh_load_end_addr was greater than mh_bss_end_addr.

A user/process could use this flaw to potentially achieve arbitrary code
execution on a host.

Upstream patch:
---------------
  -> https://lists.nongnu.org/archive/html/qemu-devel/2018-03/msg01885.html

Reference:
----------
  -> http://www.openwall.com/lists/oss-security/2018/03/08/4

Comment 1 Prasad J Pandit 2018-02-27 20:36:03 UTC
Created qemu tracking bugs for this issue:

Affects: fedora-all [bug 1549799]

Comment 5 Prasad J Pandit 2018-02-27 20:51:08 UTC
Acknowledgments:

Name: Cyrille Chatras (Orange.com), CERT-CC (Orange.com)

Comment 9 errata-xmlrpc 2018-05-10 16:04:48 UTC
This issue has been addressed in the following products:

  Red Hat Virtualization 4 for RHEL-7

Via RHSA-2018:1369 https://access.redhat.com/errata/RHSA-2018:1369

Comment 10 Joshua Padman 2018-06-07 04:50:16 UTC
This issue has been addressed in the following products:

  Red Hat OpenStack Platform 8
Via RHSA-2018:1646 https://access.redhat.com/errata/RHSA-2018:1646

  Red Hat OpenStack Platform 9
Via RHSA-2018:1645 https://access.redhat.com/errata/RHSA-2018:1645

  Red Hat OpenStack Platform 10
Via RHSA-2018:1644 https://access.redhat.com/errata/RHSA-2018:1644

  Red Hat OpenStack Platform 12
Via RHSA-2018:1643 https://access.redhat.com/errata/RHSA-2018:1643

Comment 11 errata-xmlrpc 2018-08-16 14:17:17 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2018:2462 https://access.redhat.com/errata/RHSA-2018:2462


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