Improper i/o watch removal in tls handshake can lead to remote unauthenticated denial of service
CVE-2023-3354

7.5HIGH

Key Information:

Vendor
Red Hat
Status
Qemu
Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 8
Vendor
CVE Published:
11 July 2023

Summary

A vulnerability has been identified within the built-in VNC server of QEMU, where improper handling of client connections can lead to a NULL pointer dereference. When multiple clients connect to the VNC server, QEMU attempts to manage the number of connections by cleaning up previous connections. If a previous connection is in the handshake phase and subsequently fails, QEMU may attempt to clean up this connection again, resulting in this security flaw. This may allow a remote unauthenticated attacker to exploit this issue and trigger a denial of service.

References

https://access.redhat.com/security/cve/CVE-2023-3354
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2216478
issue-trackingx_refsource_REDHAT
https://lists.fedoraproject.org/archives/list/package-ann...

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Red Hat would like to thank jiangyegen (Huawei Vulnerability Management Center) and yexiao7 (Huawei Vulnerability Management Center) for reporting this issue.
.