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Related Vulnerabilities: CVE-2020-1983

A use after free vulnerability in ip_reass() in ip_input.c of libslirp 4.2.0 and prior releases allows crafted packets to cause a denial of service. A use-after-free flaw was found in the SLiRP networking implementation of the QEMU emulator. Specifically, this flaw occurs in the ip_reass() routine while reassembling incoming IP fragments whose combined size is bigger than 65k. This flaw allows an attacker to crash the QEMU process on the host, resulting in a denial of service. (CVE-2020-1983)

Source

ALAS2-2020-1485

Amazon Linux 2 Security Advisory: ALAS-2020-1485
Advisory Release Date: 2020-09-01 00:40 Pacific
Advisory Updated Date: 2020-09-02 18:11 Pacific

Severity: Medium

References: CVE-2020-1983

Issue Overview:

A use after free vulnerability in ip_reass() in ip_input.c of libslirp 4.2.0 and prior releases allows crafted packets to cause a denial of service. A use-after-free flaw was found in the SLiRP networking implementation of the QEMU emulator. Specifically, this flaw occurs in the ip_reass() routine while reassembling incoming IP fragments whose combined size is bigger than 65k. This flaw allows an attacker to crash the QEMU process on the host, resulting in a denial of service. (CVE-2020-1983)

Affected Packages:

qemu

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

New Packages:

aarch64:
    qemu-3.1.0-8.amzn2.0.4.aarch64
    qemu-common-3.1.0-8.amzn2.0.4.aarch64
    qemu-guest-agent-3.1.0-8.amzn2.0.4.aarch64
    qemu-img-3.1.0-8.amzn2.0.4.aarch64
    ivshmem-tools-3.1.0-8.amzn2.0.4.aarch64
    qemu-block-curl-3.1.0-8.amzn2.0.4.aarch64
    qemu-block-dmg-3.1.0-8.amzn2.0.4.aarch64
    qemu-block-iscsi-3.1.0-8.amzn2.0.4.aarch64
    qemu-block-nfs-3.1.0-8.amzn2.0.4.aarch64
    qemu-block-rbd-3.1.0-8.amzn2.0.4.aarch64
    qemu-block-ssh-3.1.0-8.amzn2.0.4.aarch64
    qemu-audio-alsa-3.1.0-8.amzn2.0.4.aarch64
    qemu-audio-oss-3.1.0-8.amzn2.0.4.aarch64
    qemu-audio-pa-3.1.0-8.amzn2.0.4.aarch64
    qemu-audio-sdl-3.1.0-8.amzn2.0.4.aarch64
    qemu-ui-curses-3.1.0-8.amzn2.0.4.aarch64
    qemu-ui-gtk-3.1.0-8.amzn2.0.4.aarch64
    qemu-ui-sdl-3.1.0-8.amzn2.0.4.aarch64
    qemu-kvm-3.1.0-8.amzn2.0.4.aarch64
    qemu-kvm-core-3.1.0-8.amzn2.0.4.aarch64
    qemu-user-3.1.0-8.amzn2.0.4.aarch64
    qemu-user-binfmt-3.1.0-8.amzn2.0.4.aarch64
    qemu-user-static-3.1.0-8.amzn2.0.4.aarch64
    qemu-system-aarch64-3.1.0-8.amzn2.0.4.aarch64
    qemu-system-aarch64-core-3.1.0-8.amzn2.0.4.aarch64
    qemu-system-x86-3.1.0-8.amzn2.0.4.aarch64
    qemu-system-x86-core-3.1.0-8.amzn2.0.4.aarch64
    qemu-debuginfo-3.1.0-8.amzn2.0.4.aarch64

i686:
    qemu-3.1.0-8.amzn2.0.4.i686
    qemu-common-3.1.0-8.amzn2.0.4.i686
    qemu-guest-agent-3.1.0-8.amzn2.0.4.i686
    qemu-img-3.1.0-8.amzn2.0.4.i686
    ivshmem-tools-3.1.0-8.amzn2.0.4.i686
    qemu-block-curl-3.1.0-8.amzn2.0.4.i686
    qemu-block-dmg-3.1.0-8.amzn2.0.4.i686
    qemu-block-iscsi-3.1.0-8.amzn2.0.4.i686
    qemu-block-nfs-3.1.0-8.amzn2.0.4.i686
    qemu-block-ssh-3.1.0-8.amzn2.0.4.i686
    qemu-audio-alsa-3.1.0-8.amzn2.0.4.i686
    qemu-audio-oss-3.1.0-8.amzn2.0.4.i686
    qemu-audio-pa-3.1.0-8.amzn2.0.4.i686
    qemu-audio-sdl-3.1.0-8.amzn2.0.4.i686
    qemu-ui-curses-3.1.0-8.amzn2.0.4.i686
    qemu-ui-gtk-3.1.0-8.amzn2.0.4.i686
    qemu-ui-sdl-3.1.0-8.amzn2.0.4.i686
    qemu-kvm-3.1.0-8.amzn2.0.4.i686
    qemu-kvm-core-3.1.0-8.amzn2.0.4.i686
    qemu-user-3.1.0-8.amzn2.0.4.i686
    qemu-user-binfmt-3.1.0-8.amzn2.0.4.i686
    qemu-user-static-3.1.0-8.amzn2.0.4.i686
    qemu-system-aarch64-3.1.0-8.amzn2.0.4.i686
    qemu-system-aarch64-core-3.1.0-8.amzn2.0.4.i686
    qemu-system-x86-3.1.0-8.amzn2.0.4.i686
    qemu-system-x86-core-3.1.0-8.amzn2.0.4.i686
    qemu-debuginfo-3.1.0-8.amzn2.0.4.i686

src:
    qemu-3.1.0-8.amzn2.0.4.src

x86_64:
    qemu-3.1.0-8.amzn2.0.4.x86_64
    qemu-common-3.1.0-8.amzn2.0.4.x86_64
    qemu-guest-agent-3.1.0-8.amzn2.0.4.x86_64
    qemu-img-3.1.0-8.amzn2.0.4.x86_64
    ivshmem-tools-3.1.0-8.amzn2.0.4.x86_64
    qemu-block-curl-3.1.0-8.amzn2.0.4.x86_64
    qemu-block-dmg-3.1.0-8.amzn2.0.4.x86_64
    qemu-block-iscsi-3.1.0-8.amzn2.0.4.x86_64
    qemu-block-nfs-3.1.0-8.amzn2.0.4.x86_64
    qemu-block-rbd-3.1.0-8.amzn2.0.4.x86_64
    qemu-block-ssh-3.1.0-8.amzn2.0.4.x86_64
    qemu-audio-alsa-3.1.0-8.amzn2.0.4.x86_64
    qemu-audio-oss-3.1.0-8.amzn2.0.4.x86_64
    qemu-audio-pa-3.1.0-8.amzn2.0.4.x86_64
    qemu-audio-sdl-3.1.0-8.amzn2.0.4.x86_64
    qemu-ui-curses-3.1.0-8.amzn2.0.4.x86_64
    qemu-ui-gtk-3.1.0-8.amzn2.0.4.x86_64
    qemu-ui-sdl-3.1.0-8.amzn2.0.4.x86_64
    qemu-kvm-3.1.0-8.amzn2.0.4.x86_64
    qemu-kvm-core-3.1.0-8.amzn2.0.4.x86_64
    qemu-user-3.1.0-8.amzn2.0.4.x86_64
    qemu-user-binfmt-3.1.0-8.amzn2.0.4.x86_64
    qemu-user-static-3.1.0-8.amzn2.0.4.x86_64
    qemu-system-aarch64-3.1.0-8.amzn2.0.4.x86_64
    qemu-system-aarch64-core-3.1.0-8.amzn2.0.4.x86_64
    qemu-system-x86-3.1.0-8.amzn2.0.4.x86_64
    qemu-system-x86-core-3.1.0-8.amzn2.0.4.x86_64
    qemu-debuginfo-3.1.0-8.amzn2.0.4.x86_64

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