SB2020090715 - Debian update for qemu
Published: September 7, 2020
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 4 secuirty vulnerabilities.
1) Integer overflow (CVE-ID: CVE-2020-12829)
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to integer overflow in the SM501 display driver implementation. This flaw occurs in the COPY_AREA macro while handling MMIO write operations through the sm501_2d_engine_write() callback. A remote user could abuse this flaw to crash the QEMU process in
sm501_2d_operation() in hw/display/sm501.c on the host, resulting in a
denial of service.
2) Out-of-bounds write (CVE-ID: CVE-2020-14364)
The vulnerability allows a remote user to compromise vulnerable system.
The vulnerability exists due to a boundary error within the USB emulator in QEMU. A remote user with access to guest operating system on the guest operating system can send specially crafted USB packets, trigger out-of-bounds write and execute arbitrary code on the host system.
3) Stack-based buffer overflow (CVE-ID: CVE-2020-15863)
The vulnerability allows a local user to execute arbitrary code on the target system with elevated privileges.
The vulnerability exists due to a boundary error when processing packets in xgmac_enet_send() in hw/net/xgmac.c. A local user on the guest operating system can send a specially crafted request to the application, trigger stack-based buffer overflow and execute arbitrary code on the target system with elevated privileges.
4) Reachable Assertion (CVE-ID: CVE-2020-16092)
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a reachable assertion when processing certain network packets on "e1000e" and "vmxnet3" devices in net_tx_pkt_add_raw_fragment() in hw/net/net_tx_pkt.c. A remote attacker on a guest operating system can send a specially crafted packet that will result in hypervisor crash.
Remediation
Install update from vendor's website.