Bug 1898579 (CVE-2020-25723) - CVE-2020-25723 QEMU: assertion failure through usb_packet_unmap() in hw/usb/hcd-ehci.c
Summary: CVE-2020-25723 QEMU: assertion failure through usb_packet_unmap() in hw/usb/h...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2020-25723
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:
Depends On: 1898625 1898624 1898628 1898629 1898630 1901875 1901876 1910662 1918008 1920266
Blocks: 1892324
TreeView+ depends on / blocked
 
Reported: 2020-11-17 14:49 UTC by Mauro Matteo Cascella
Modified: 2021-05-18 14:51 UTC (History)
34 users (show)

Fixed In Version: qemu 5.2.0
Doc Type: If docs needed, set a value
Doc Text:
A reachable assertion vulnerability was found in the USB EHCI emulation code of QEMU. This issue occurs while processing USB requests due to missed handling of DMA memory map failure. This flaw allows a malicious privileged user within the guest to send bogus USB requests and crash the QEMU process on the host, resulting in a denial of service. The highest threat from this vulnerability is to system availability.
Clone Of:
Environment:
Last Closed: 2021-02-23 19:01:54 UTC
Embargoed:

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Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2021:0648 0 None None None 2021-02-23 18:44:16 UTC
Red Hat Product Errata RHSA-2021:0771 0 None None None 2021-03-09 11:12:33 UTC

Description Mauro Matteo Cascella 2020-11-17 14:49:07 UTC 
A security issue was found in the USB EHCI emulation code of QEMU. It could occur while processing USB requests via ehci_execute() in hw/usb/hcd-ehci.c. More specifically, DMA memory map failure was not properly detected leading to reachable assertion (CWE-617) in a later call of address_space_unmap() via usb_packet_unmap(). This was fixed in the following commit by checking the return value of usb_packet_map(). A malicious privileged user within the guest may abuse this flaw to send bogus USB requests and crash the QEMU process on the host, resulting in a denial of service.

Upstream fix:
https://git.qemu.org/?p=qemu.git;a=commit;h=2fdb42d840400d58f2e706ecca82c142b97bcbd6
Comment 1 Mauro Matteo Cascella 2020-11-17 14:49:16 UTC 
Acknowledgments:

Name: Cheolwoo Myung
Comment 3 Mauro Matteo Cascella 2020-11-17 16:55:35 UTC 
Created qemu tracking bugs for this issue:

Affects: epel-7 [bug 1898625]
Affects: fedora-all [bug 1898624]
Comment 8 RaTasha Tillery-Smith 2021-02-22 17:10:59 UTC 
Statement:

Releases of Red Hat OpenStack Platform versions 15 and newer consume fixes directly from the Red Hat Enterprise Linux 8 Advanced Virtualization repository.
Comment 9 errata-xmlrpc 2021-02-23 18:44:14 UTC 
This issue has been addressed in the following products:

  Advanced Virtualization for RHEL 8.2.1

Via RHSA-2021:0648 https://access.redhat.com/errata/RHSA-2021:0648
Comment 10 Product Security DevOps Team 2021-02-23 19:01:54 UTC 
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2020-25723
Comment 11 errata-xmlrpc 2021-03-09 11:12:27 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.2 Extended Update Support

Via RHSA-2021:0771 https://access.redhat.com/errata/RHSA-2021:0771
Comment 12 errata-xmlrpc 2021-05-18 14:51:23 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2021:1762 https://access.redhat.com/errata/RHSA-2021:1762
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