CVE-2023-3255: Qemu: vnc: infinite loop in inflate_buffer() leads to denial of service
First published: Thu Jun 29 2023(Updated: )
A flaw was found in the QEMU built-in VNC server while processing ClientCutText messages. A wrong exit condition may lead to an infinite loop when inflating an attacker controlled zlib buffer in the `inflate_buffer` function. This could allow a remote authenticated client who is able to send a clipboard to the VNC server to trigger a denial of service.
Credit: secalert@redhat.com secalert@redhat.com secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/qemu | <8.1.0 | 8.1.0 |
| debian/qemu | 1:5.2+dfsg-11+deb11u3 1:5.2+dfsg-11+deb11u2 1:7.2+dfsg-7+deb12u7 1:9.0.2+ds-2 1:9.1.0+ds-3 | |
| QEMU KVM | <=8.0.3 | |
| Red Hat Enterprise Linux | =8.0 | |
| Red Hat Enterprise Linux | =9.0 | |
| Fedoraproject Fedora | =38 |
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Reference Links
- https://access.redhat.com/security/cve/CVE-2023-3255
- https://bugzilla.redhat.com/show_bug.cgi?id=2218486
- https://security.netapp.com/advisory/ntap-20231020-0008/
- https://lists.nongnu.org/archive/html/qemu-devel/2023-07/msg00596.html
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2219543
- https://gitlab.com/qemu-project/qemu/-/commit/d921fea3
- https://access.redhat.com/errata/RHSA-2024:2135
- https://access.redhat.com/errata/RHSA-2024:2962
- https://launchpad.net/bugs/cve/CVE-2023-3255
- https://gitlab.com/qemu-project/qemu/-/commit/35720b3d90866ed4c174eb35762e04a1b9e533d1
- https://gitlab.com/qemu-project/qemu/-/commit/0bf41cab93e5c72dcda717abd625698b59d9ba3e
- https://security-tracker.debian.org/tracker/CVE-2023-3255
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-3255
- https://nvd.nist.gov/vuln/detail/CVE-2023-3255
- https://ubuntu.com/security/CVE-2023-3255
Frequently Asked Questions
What is CVE-2023-3255?
CVE-2023-3255 is a vulnerability found in the QEMU built-in VNC server while processing ClientCutText messages.
What is the severity of CVE-2023-3255?
The severity of CVE-2023-3255 is medium (6.5).
How does CVE-2023-3255 affect the software?
CVE-2023-3255 affects QEMU versions up to but not including 8.1.0 and Red Hat Enterprise Linux versions 8.0 and 9.0.
How can CVE-2023-3255 be fixed?
To fix CVE-2023-3255, it is recommended to update QEMU to version 8.1.0 or apply the appropriate remedy provided by Red Hat.
Where can I find more information about CVE-2023-3255?
More information about CVE-2023-3255 can be found at the following references: - [Red Hat Security Advisory](https://access.redhat.com/security/cve/CVE-2023-3255) - [Bugzilla](https://bugzilla.redhat.com/show_bug.cgi?id=2218486) - [QEMU Developer Mailing List](https://lists.nongnu.org/archive/html/qemu-devel/2023-07/msg00596.html)
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