[SECURITY] [DLA 2623-1] qemu security update

Debian LTS Advisory DLA-2623-1 [email protected]
https://www.debian.org/lts/security/ Markus Koschany
April 10, 2021 https://wiki.debian.org/LTS

Package : qemu
Version : 1:2.8+dfsg-6+deb9u14
CVE ID : CVE-2020-17380 CVE-2021-3392 CVE-2021-3409 CVE-2021-3416
CVE-2021-20203 CVE-2021-20255 CVE-2021-20257
Debian Bug : 984450 984451 984452 984448 984449 970937

Several security vulnerabilities have been discovered in QEMU, a fast processor
emulator.

CVE-2021-20257

net: e1000: infinite loop while processing transmit descriptors

CVE-2021-20255

A stack overflow via an infinite recursion vulnerability was found in the
eepro100 i8255x device emulator of QEMU. This issue occurs while processing
controller commands due to a DMA reentry issue. This flaw allows a guest
user or process to consume CPU cycles or crash the QEMU process on the
host, resulting in a denial of service.

CVE-2021-20203

An integer overflow issue was found in the vmxnet3 NIC emulator of the
QEMU. It may occur if a guest was to supply invalid values for rx/tx queue
size or other NIC parameters. A privileged guest user may use this flaw to
crash the QEMU process on the host resulting in DoS scenario.

CVE-2021-3416

A potential stack overflow via infinite loop issue was found in various NIC
emulators of QEMU in versions up to and including 5.2.0. The issue occurs
in loopback mode of a NIC wherein reentrant DMA checks get bypassed. A
guest user/process may use this flaw to consume CPU cycles or crash the
QEMU process on the host resulting in DoS scenario.

CVE-2021-3416

The patch for CVE-2020-17380/CVE-2020-25085 was found to be ineffective,
thus making QEMU vulnerable to the out-of-bounds read/write access issues
previously found in the SDHCI controller emulation code. This flaw allows a
malicious privileged guest to crash the QEMU process on the host, resulting
in a denial of service or potential code execution.

For Debian 9 stretch, these problems have been fixed in version
1:2.8+dfsg-6+deb9u14.

We recommend that you upgrade your qemu packages.

For the detailed security status of qemu please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/qemu

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS
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