Bug 1827808 (CVE-2020-10717) - CVE-2020-10717 QEMU: virtiofsd: guest may open maximum file descriptor to cause DoS
Summary: CVE-2020-10717 QEMU: virtiofsd: guest may open maximum file descriptor to cau...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2020-10717
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: 1817445 1830842 1830844 1830845
Blocks: 1825755
TreeView+ depends on / blocked
 
Reported: 2020-04-24 20:42 UTC by Prasad Pandit
Modified: 2022-10-02 21:51 UTC (History)
26 users (show)

Fixed In Version: QEMU-5.0.1
Doc Type: If docs needed, set a value
Doc Text:
A potential DoS flaw was found in the virtio-fs shared file system daemon (virtiofsd) implementation of the QEMU version >= v5.0. Virtio-fs is meant to share a host file system directory with a guest via virtio-fs device. If the guest opens the maximum number of file descriptors under the shared directory, a denial of service may occur. This flaw allows a guest user/process to cause this denial of service on the host.
Clone Of:
Environment:
Last Closed: 2021-12-15 11:31:52 UTC
Embargoed:

Attachments (Terms of Use)

Description Prasad Pandit 2020-04-24 20:42:59 UTC 
A potential DoS issue was found in the virtio-fs shared file system daemon (virtiofsd) implementation of the QEMU. Virtiofsd is meant to share a host file system directory with a guest via virtio-fs device. The said DoS may occur on the host, if the guest was to open the maximum number of file descriptors under the shared directory. A guest user/process may use this flaw to cause DoS issue on the host.

Upstream patch(es):
-------------------
  -> https://lists.gnu.org/archive/html/qemu-devel/2020-05/msg00143.html
  -> https://lists.gnu.org/archive/html/qemu-devel/2020-05/msg00141.html

Reference:
----------
  -> https://www.openwall.com/lists/oss-security/2020/05/04/1
Comment 1 Prasad Pandit 2020-04-24 20:43:05 UTC 
Acknowledgments:

Name: Yuval Avrahami (Palo Alto Networks)
Comment 3 Prasad Pandit 2020-05-04 05:51:21 UTC 
Created qemu tracking bugs for this issue:

Affects: fedora-rawhide [bug 1830842]
Note You need to log in before you can comment on or make changes to this bug.