HIGH
A stack-based buffer overflow vulnerability was found in NBD server implementation in qemu before 2.11 allowing a client to request an export name of size up to 4096 bytes, which in fact should be limited to 256 bytes, causing an out-of-bounds stack write in the qemu process. If NBD server requires TLS, the attacker cannot trigger the buffer overflow without first successfully negotiating TLS.
http://www.openwall.com/lists/oss-security/2017/11/28/8
http://www.securityfocus.com/bid/101975
https://access.redhat.com/errata/RHSA-2018:1104
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-15118
https://lists.gnu.org/archive/html/qemu-devel/2017-11/msg05045.html
Source: MITRE
Published: 2018-07-27
Updated: 2018-09-24
Type: CWE-787
Base Score: 7.5
Vector: (AV:N/AC:L/Au:N/C:P/I:P/A:P)
Impact Score: 6.4
Exploitability Score: 10
Severity: HIGH
Base Score: 9.8
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Impact Score: 5.9
Exploitability Score: 3.9
Severity: CRITICAL