{"id":"UBUNTU-CVE-2023-3255","details":"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.","modified":"2026-02-04T02:18:57.130276Z","published":"2023-09-13T17:15:00Z","related":["USN-6567-1"],"upstream":["CVE-2023-3255"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2023-3255"},{"type":"REPORT","url":"https://lists.nongnu.org/archive/html/qemu-devel/2023-07/msg00596.html"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-6567-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2023-3255"}],"affected":[{"package":{"name":"qemu","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/qemu@1:6.2+dfsg-2ubuntu6.16?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:6.2+dfsg-2ubuntu6.16"}]}],"versions":["1:6.0+dfsg-2expubuntu1","1:6.0+dfsg-2expubuntu2","1:6.0+dfsg-2expubuntu4","1:6.2+dfsg-2ubuntu5","1:6.2+dfsg-2ubuntu6","1:6.2+dfsg-2ubuntu6.1","1:6.2+dfsg-2ubuntu6.2","1:6.2+dfsg-2ubuntu6.3","1:6.2+dfsg-2ubuntu6.4","1:6.2+dfsg-2ubuntu6.5","1:6.2+dfsg-2ubuntu6.6","1:6.2+dfsg-2ubuntu6.7","1:6.2+dfsg-2ubuntu6.8","1:6.2+dfsg-2ubuntu6.9","1:6.2+dfsg-2ubuntu6.10","1:6.2+dfsg-2ubuntu6.11","1:6.2+dfsg-2ubuntu6.12","1:6.2+dfsg-2ubuntu6.13","1:6.2+dfsg-2ubuntu6.14","1:6.2+dfsg-2ubuntu6.15"],"ecosystem_specific":{"priority_reason":"This can only be used as a DoS by an authenticated user to the VNC service.","binaries":[{"binary_name":"qemu","binary_version":"1:6.2+dfsg-2ubuntu6.16"},{"binary_name":"qemu-block-extra","binary_version":"1:6.2+dfsg-2ubuntu6.16"},{"binary_name":"qemu-guest-agent","binary_version":"1:6.2+dfsg-2ubuntu6.16"},{"binary_name":"qemu-system","binary_version":"1:6.2+dfsg-2ubuntu6.16"},{"binary_name":"qemu-system-arm","binary_version":"1:6.2+dfsg-2ubuntu6.16"},{"binary_name":"qemu-system-common","binary_version":"1:6.2+dfsg-2ubuntu6.16"},{"binary_name":"qemu-system-data","binary_version":"1:6.2+dfsg-2ubuntu6.16"},{"binary_name":"qemu-system-gui","binary_version":"1:6.2+dfsg-2ubuntu6.16"},{"binary_name":"qemu-system-mips","binary_version":"1:6.2+dfsg-2ubuntu6.16"},{"binary_name":"qemu-system-misc","binary_version":"1:6.2+dfsg-2ubuntu6.16"},{"binary_name":"qemu-system-ppc","binary_version":"1:6.2+dfsg-2ubuntu6.16"},{"binary_name":"qemu-system-s390x","binary_version":"1:6.2+dfsg-2ubuntu6.16"},{"binary_name":"qemu-system-sparc","binary_version":"1:6.2+dfsg-2ubuntu6.16"},{"binary_name":"qemu-system-x86","binary_version":"1:6.2+dfsg-2ubuntu6.16"},{"binary_name":"qemu-system-x86-microvm","binary_version":"1:6.2+dfsg-2ubuntu6.16"},{"binary_name":"qemu-system-x86-xen","binary_version":"1:6.2+dfsg-2ubuntu6.16"},{"binary_name":"qemu-user","binary_version":"1:6.2+dfsg-2ubuntu6.16"},{"binary_name":"qemu-user-binfmt","binary_version":"1:6.2+dfsg-2ubuntu6.16"},{"binary_name":"qemu-user-static","binary_version":"1:6.2+dfsg-2ubuntu6.16"},{"binary_name":"qemu-utils","binary_version":"1:6.2+dfsg-2ubuntu6.16"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-3255.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"low"}]}