CVE-2016-1568
Description
A use-after-free flaw was found in the way QEMU's IDE AHCI emulator processed certain AHCI Native Command Queuing (NCQ) AIO commands. A privileged guest user could use this flaw to crash the QEMU process instance or, potentially, execute arbitrary code on the host with privileges of the QEMU process.
Statement
The vector of exploit requires to enable TIOCSTI with sysctl, because it is by default disabled since RHEL9 and on. Then, the user would have to be in root terminal, from there the user would have to run a malicious app that would use TIOCSTI to jump out of the child non-root shell back to the parent root shell.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v2 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 4 | 6.9 | N/A |
| Attack Vector | Adjacent Network | Local | N/A |
| Access Complexity | High | Medium | N/A |
| Authentication | Single | None | N/A |
| Confidentiality Impact | Partial | Complete | N/A |
| Integrity Impact | Partial | Complete | N/A |
| Availability Impact | Partial | Complete | N/A |
Vector
Red Hat: AV:A/AC:H/Au:S/C:P/I:P/A:P
NVD: AV:L/AC:M/Au:N/C:C/I:C/A:C
Acknowledgements
Red Hat would like to thank Qinghao Tang (Qihoo 360 Marvel Team) for reporting this issue.
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