Bug 1808510 (CVE-2020-12829) - CVE-2020-12829 qemu: OOB read and write due to integer overflow in sm501_2d_operation() in hw/display/sm501.c
Summary: CVE-2020-12829 qemu: OOB read and write due to integer overflow in sm501_2d_o...
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2020-12829
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
: 1786026 (view as bug list)
Depends On: 1819670 1819639 1819640 1819641 1819643 1819645 1819669 1819671 1819694 1819695 1819701
Blocks: 1786593
TreeView+ depends on / blocked
 
Reported: 2020-02-28 17:11 UTC by Mauro Matteo Cascella
Modified: 2021-02-16 20:31 UTC (History)
38 users (show)

Fixed In Version:
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Doc Text:
An integer overflow flaw was found in the SM501 display driver implementation of the QEMU emulator. This flaw occurs in the COPY_AREA macro while handling MMIO write operations through the sm501_2d_engine_write() callback. A local attacker could abuse this flaw to crash the QEMU process on the host, resulting in a denial of service.
Clone Of:
Environment:
Last Closed: 2020-04-15 10:31:49 UTC
Embargoed:

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Description Mauro Matteo Cascella 2020-02-28 17:11:41 UTC 
An out-of-bounds read/write vulnerability was found in function Sm501_2d_operation() in hw/display/sm501.c. The OOB flaw is caused by an integer overflow in COPY_AREA when the `rtl` parameter is set to 1, and either `src_y` or `src_x` is less than `operation_height`. Please refer to the following duplicate bug for further details: https://bugzilla.redhat.com/show_bug.cgi?id=1786026.

Upstream fix:
https://git.qemu.org/?p=qemu.git;a=commit;h=b15a22bbcbe6a78dc3d88fe3134985e4cdd87de4
Comment 1 Mauro Matteo Cascella 2020-03-03 17:18:03 UTC 
*** Bug 1786026 has been marked as a duplicate of this bug. ***
Comment 4 Mauro Matteo Cascella 2020-04-01 09:43:14 UTC 
Created qemu tracking bugs for this issue:

Affects: epel-7 [bug 1819670]
Affects: fedora-all [bug 1819669]


Created xen tracking bugs for this issue:

Affects: fedora-all [bug 1819671]
Comment 6 Mauro Matteo Cascella 2020-04-01 11:00:22 UTC 
Acknowledgments:

Name: Ziming Zhang
Comment 12 Mauro Matteo Cascella 2020-04-15 08:26:04 UTC 
Statement:

This flaw did not affect the versions of `qemu-kvm` as shipped with Red Hat Enterprise Linux 6, as they did not include the vulnerable code, which was introduced in a later version of the package.
Red Hat Enterprise Linux 7, 8 and RHEL Advanced Virtualization are not affected by this flaw, as the SM501 device is not built and shipped with the products listed.
Comment 15 Mauro Matteo Cascella 2020-05-14 07:51:12 UTC 
CVE-2020-12829 assigned via MITRE form.
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