SB2022121225 - Ubuntu update for qemu
Published: December 12, 2022
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 6 secuirty vulnerabilities.
1) Release of invalid pointer or reference (CVE-ID: CVE-2021-3682)
The vulnerability allows a remote user to escalate privileges on the system.
The vulnerability exists in the USB redirector device emulation of QEMU when dropping packets during a bulk transfer from a SPICE client. A remote user can make QEMU call free() with faked heap chunk metadata to perform a denial of service or escalate privileges on the system.
2) Use-after-free (CVE-ID: CVE-2021-3750)
The vulnerability allows a remote user to compromise vulnerable system.
The vulnerability exists due to a use-after-free error in the USB EHCI controller emulation of QEMU. A remote guest can trigger a use-after-free error and execute arbitrary code on the host OS.
3) Off-by-one (CVE-ID: CVE-2021-3930)
The vulnerability allows a remote user to perform a denial of service (DoS) attack.
The vulnerability exists due to an off-by-one error in the SCSI device emulation in QEMU. A remote user on the guest OS can can trigger an off-by-one error while processing MODE SELECT commands in mode_sense_page() if the 'page' argument is set to MODE_PAGE_ALLS (0x3f). Successful exploitation of the vulnerability may result in QEMU crash.
4) Use-after-free (CVE-ID: CVE-2022-0216)
The vulnerability allows a remote user to perform a denial of service (DoS) attack.
The vulnerability exists due to a use-after-free error in the LSI53C895A SCSI Host Bus Adapter emulation of QEMU when processing repeated messages to cancel the current SCSI request via the lsi_do_msgout() function. A remote user on the guest OS can trigger a use-after-free error and perform a denial of service attack against the QEMU host.
Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.
5) Out-of-bounds write (CVE-ID: CVE-2022-2962)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a boundary error in the Tulip device emulation in QEMU. A local user can trigger an out-of-bounds write and execute arbitrary code with elevated privileges on the host OS.
6) Integer underflow (CVE-ID: CVE-2022-3165)
The vulnerability allows a remote user to perform a denial of service (DoS) attack.
The vulnerability exists due to integer underflow in the QEMU VNC server while processing ClientCutText messages in the extended format. A remote client can send a specially crafted payload message to the VNC server and perform a denial of service (DoS) attack.
Remediation
Install update from vendor's website.