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amazonAmazonALAS2-2020-1562
HistoryNov 09, 2020 - 9:04 p.m.

Important: qemu

2020-11-0921:04:00
alas.aws.amazon.com
13

5 Medium

CVSS3

Attack Vector

LOCAL

Attack Complexity

HIGH

Privileges Required

HIGH

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

LOW

Integrity Impact

LOW

Availability Impact

LOW

CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:L

6.1 Medium

AI Score

Confidence

High

4.4 Medium

CVSS2

Access Vector

LOCAL

Access Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:L/AC:M/Au:N/C:P/I:P/A:P

0.0005 Low

EPSS

Percentile

14.9%

Issue Overview:

A memory leakage flaw was found in the way the VNC display driver of QEMU handled the connection disconnect when ZRLE and Tight encoding are enabled. Two VncState objects are created, and one allocates memory for the Zlib’s data object. This allocated memory is not freed upon disconnection, resulting in a memory leak. An attacker able to connect to the VNC server could use this flaw to leak host memory, leading to a potential denial of service. (CVE-2019-20382)

An out-of-bounds read/write access flaw was found in the USB emulator of the QEMU. This issue occurs while processing USB packets from a guest when USBDevice ‘setup_len’ exceeds its ‘data_buf[4096]’ in the do_token_in, do_token_out routines. This flaw allows a guest user to crash the QEMU process, resulting in a denial of service, or the potential execution of arbitrary code with the privileges of the QEMU process on the host. (CVE-2020-14364)

Affected Packages:

qemu

Note:

This advisory is applicable to Amazon Linux 2 (AL2) Core repository. Visit this FAQ section for the difference between AL2 Core and AL2 Extras advisories.

Issue Correction:
Run yum update qemu to update your system.

New Packages:

aarch64:  
    qemu-3.1.0-8.amzn2.0.5.aarch64  
    qemu-common-3.1.0-8.amzn2.0.5.aarch64  
    qemu-guest-agent-3.1.0-8.amzn2.0.5.aarch64  
    qemu-img-3.1.0-8.amzn2.0.5.aarch64  
    ivshmem-tools-3.1.0-8.amzn2.0.5.aarch64  
    qemu-block-curl-3.1.0-8.amzn2.0.5.aarch64  
    qemu-block-dmg-3.1.0-8.amzn2.0.5.aarch64  
    qemu-block-iscsi-3.1.0-8.amzn2.0.5.aarch64  
    qemu-block-nfs-3.1.0-8.amzn2.0.5.aarch64  
    qemu-block-rbd-3.1.0-8.amzn2.0.5.aarch64  
    qemu-block-ssh-3.1.0-8.amzn2.0.5.aarch64  
    qemu-audio-alsa-3.1.0-8.amzn2.0.5.aarch64  
    qemu-audio-oss-3.1.0-8.amzn2.0.5.aarch64  
    qemu-audio-pa-3.1.0-8.amzn2.0.5.aarch64  
    qemu-audio-sdl-3.1.0-8.amzn2.0.5.aarch64  
    qemu-ui-curses-3.1.0-8.amzn2.0.5.aarch64  
    qemu-ui-gtk-3.1.0-8.amzn2.0.5.aarch64  
    qemu-ui-sdl-3.1.0-8.amzn2.0.5.aarch64  
    qemu-kvm-3.1.0-8.amzn2.0.5.aarch64  
    qemu-kvm-core-3.1.0-8.amzn2.0.5.aarch64  
    qemu-user-3.1.0-8.amzn2.0.5.aarch64  
    qemu-user-binfmt-3.1.0-8.amzn2.0.5.aarch64  
    qemu-user-static-3.1.0-8.amzn2.0.5.aarch64  
    qemu-system-aarch64-3.1.0-8.amzn2.0.5.aarch64  
    qemu-system-aarch64-core-3.1.0-8.amzn2.0.5.aarch64  
    qemu-system-x86-3.1.0-8.amzn2.0.5.aarch64  
    qemu-system-x86-core-3.1.0-8.amzn2.0.5.aarch64  
    qemu-debuginfo-3.1.0-8.amzn2.0.5.aarch64  
  
i686:  
    qemu-3.1.0-8.amzn2.0.5.i686  
    qemu-common-3.1.0-8.amzn2.0.5.i686  
    qemu-guest-agent-3.1.0-8.amzn2.0.5.i686  
    qemu-img-3.1.0-8.amzn2.0.5.i686  
    ivshmem-tools-3.1.0-8.amzn2.0.5.i686  
    qemu-block-curl-3.1.0-8.amzn2.0.5.i686  
    qemu-block-dmg-3.1.0-8.amzn2.0.5.i686  
    qemu-block-iscsi-3.1.0-8.amzn2.0.5.i686  
    qemu-block-nfs-3.1.0-8.amzn2.0.5.i686  
    qemu-block-ssh-3.1.0-8.amzn2.0.5.i686  
    qemu-audio-alsa-3.1.0-8.amzn2.0.5.i686  
    qemu-audio-oss-3.1.0-8.amzn2.0.5.i686  
    qemu-audio-pa-3.1.0-8.amzn2.0.5.i686  
    qemu-audio-sdl-3.1.0-8.amzn2.0.5.i686  
    qemu-ui-curses-3.1.0-8.amzn2.0.5.i686  
    qemu-ui-gtk-3.1.0-8.amzn2.0.5.i686  
    qemu-ui-sdl-3.1.0-8.amzn2.0.5.i686  
    qemu-kvm-3.1.0-8.amzn2.0.5.i686  
    qemu-kvm-core-3.1.0-8.amzn2.0.5.i686  
    qemu-user-3.1.0-8.amzn2.0.5.i686  
    qemu-user-binfmt-3.1.0-8.amzn2.0.5.i686  
    qemu-user-static-3.1.0-8.amzn2.0.5.i686  
    qemu-system-aarch64-3.1.0-8.amzn2.0.5.i686  
    qemu-system-aarch64-core-3.1.0-8.amzn2.0.5.i686  
    qemu-system-x86-3.1.0-8.amzn2.0.5.i686  
    qemu-system-x86-core-3.1.0-8.amzn2.0.5.i686  
    qemu-debuginfo-3.1.0-8.amzn2.0.5.i686  
  
src:  
    qemu-3.1.0-8.amzn2.0.5.src  
  
x86_64:  
    qemu-3.1.0-8.amzn2.0.5.x86_64  
    qemu-common-3.1.0-8.amzn2.0.5.x86_64  
    qemu-guest-agent-3.1.0-8.amzn2.0.5.x86_64  
    qemu-img-3.1.0-8.amzn2.0.5.x86_64  
    ivshmem-tools-3.1.0-8.amzn2.0.5.x86_64  
    qemu-block-curl-3.1.0-8.amzn2.0.5.x86_64  
    qemu-block-dmg-3.1.0-8.amzn2.0.5.x86_64  
    qemu-block-iscsi-3.1.0-8.amzn2.0.5.x86_64  
    qemu-block-nfs-3.1.0-8.amzn2.0.5.x86_64  
    qemu-block-rbd-3.1.0-8.amzn2.0.5.x86_64  
    qemu-block-ssh-3.1.0-8.amzn2.0.5.x86_64  
    qemu-audio-alsa-3.1.0-8.amzn2.0.5.x86_64  
    qemu-audio-oss-3.1.0-8.amzn2.0.5.x86_64  
    qemu-audio-pa-3.1.0-8.amzn2.0.5.x86_64  
    qemu-audio-sdl-3.1.0-8.amzn2.0.5.x86_64  
    qemu-ui-curses-3.1.0-8.amzn2.0.5.x86_64  
    qemu-ui-gtk-3.1.0-8.amzn2.0.5.x86_64  
    qemu-ui-sdl-3.1.0-8.amzn2.0.5.x86_64  
    qemu-kvm-3.1.0-8.amzn2.0.5.x86_64  
    qemu-kvm-core-3.1.0-8.amzn2.0.5.x86_64  
    qemu-user-3.1.0-8.amzn2.0.5.x86_64  
    qemu-user-binfmt-3.1.0-8.amzn2.0.5.x86_64  
    qemu-user-static-3.1.0-8.amzn2.0.5.x86_64  
    qemu-system-aarch64-3.1.0-8.amzn2.0.5.x86_64  
    qemu-system-aarch64-core-3.1.0-8.amzn2.0.5.x86_64  
    qemu-system-x86-3.1.0-8.amzn2.0.5.x86_64  
    qemu-system-x86-core-3.1.0-8.amzn2.0.5.x86_64  
    qemu-debuginfo-3.1.0-8.amzn2.0.5.x86_64  

Additional References

Red Hat: CVE-2019-20382, CVE-2020-14364

Mitre: CVE-2019-20382, CVE-2020-14364

5 Medium

CVSS3

Attack Vector

LOCAL

Attack Complexity

HIGH

Privileges Required

HIGH

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

LOW

Integrity Impact

LOW

Availability Impact

LOW

CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:L

6.1 Medium

AI Score

Confidence

High

4.4 Medium

CVSS2

Access Vector

LOCAL

Access Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:L/AC:M/Au:N/C:P/I:P/A:P

0.0005 Low

EPSS

Percentile

14.9%

Related for ALAS2-2020-1562