Bug 1879801 (CVE-2020-25624) - CVE-2020-25624 QEMU: usb: hcd-ohci: out-of-bound access issue while processing transfer descriptors
Summary: CVE-2020-25624 QEMU: usb: hcd-ohci: out-of-bound access issue while processin...
Keywords:
Status: NEW
Alias: CVE-2020-25624
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:
Depends On: 1879802 1879803 1879805 1910677
Blocks: 1867982
TreeView+ depends on / blocked
 
Reported: 2020-09-17 05:14 UTC by Prasad J Pandit
Modified: 2021-02-10 14:54 UTC (History)
25 users (show)

Fixed In Version: QEMU 5.2.0
Doc Type: If docs needed, set a value
Doc Text:
A flaw was found in QEMU. An out-of-bounds read/write access issue was found in the USB OHCI controller emulator. This issue occurs while servicing transfer descriptors (TD), as the OHCI controller derives variables 'start_addr', 'end_addr', and 'len' from values supplied by the host controller driver. The host controller driver may supply values when using these variables, leading to an out-of-bounds access issue. This flaw allows a guest user or process to crash the QEMU process on the host, resulting in a denial of service.
Clone Of:
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Description Prasad J Pandit 2020-09-17 05:14:19 UTC
An out-of-bounds r/w access issue was found in the USB OHCI controller emulator of QEMU. It could occur while servicing transfer descriptors(TD), as OHCI controller derives variables 'start_addr', 'end_addr', 'len' etc. from values supplied by the host controller driver. Host controller driver may supply values such that using above variables leads to out-of-bounds access issues. A guest user/process may use this flaw to crash the QEMU process on the host resulting in DoS scenario.

Upstream patch:
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  -> https://lists.nongnu.org/archive/html/qemu-devel/2020-09/msg05492.html

Comment 1 Prasad J Pandit 2020-09-17 05:14:27 UTC
Acknowledgments:

Name: Gaoning Pan (Zhejiang university), Yongkang Jia (Zhejiang university), Yi Ren (Alibaba Cloud Intelligence Security Team)

Comment 2 Prasad J Pandit 2020-09-17 05:15:09 UTC
Created qemu tracking bugs for this issue:

Affects: fedora-all [bug 1879802]


Created xen tracking bugs for this issue:

Affects: fedora-all [bug 1879803]


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