Use-after-free in libslirp - CVE-2020-1983

Vulnerability identifier: #VU27389

CSH Severity: Medium

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2020-1983

CWE-ID: CWE-416

Exploitation vector: Remote access

Exploit availability: Public exploit is available

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a use-after-free error when processing packets within the ip_reass() function in ip_input.c in libslirp. A remote attacker can send a specially crafted packet to the application, trigger a use-after-free error and crash it.

libslirp
Amazon Linux AMI
Arch Linux
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for Power, big endian
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux Workstation
Red Hat CodeReady Linux Builder for ARM 64
Red Hat CodeReady Linux Builder for Power, little endian
Red Hat CodeReady Linux Builder for x86_64
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for ARM 64
Ubuntu
Opensuse
Fedora
qemu (Ubuntu package)
qemu (Debian package)
libslirp (Alpine package)
qemu-system-common (Ubuntu package)
qemu-system-mips (Ubuntu package)
qemu-system-arm (Ubuntu package)
qemu-system-misc (Ubuntu package)
qemu-system-ppc (Ubuntu package)
qemu-system-s390x (Ubuntu package)
qemu-system-sparc (Ubuntu package)
qemu-system (Ubuntu package)
qemu-system-x86 (Ubuntu package)
qemu-system-aarch64 (Ubuntu package)
qemu-kvm (Red Hat package)
qemu-kvm-rhev (Red Hat package)
qemu-kvm-ma (Red Hat package)
libslirp
qemu-system-x86-microvm (Ubuntu package)
qemu-system-x86-xen (Ubuntu package)
qemu-system-xen (Ubuntu package)
Red Hat Virtualization
Red Hat Enterprise Linux Advanced Virtualization
Red Hat Virtualization Manager
Red Hat OpenStack for IBM Power
Red Hat OpenStack
Juniper Junos Space

Install updates from vendor's website.

libslirp - update to 4.3.0
qemu (Ubuntu package) - addressed in versions Ubuntu Pro (Infra-only), 1:2.5+dfsg-5ubuntu10.44, 1:2.11+dfsg-1ubuntu7.26, 1:4.0+dfsg-0ubuntu9.6, 1:4.2-3ubuntu6.1, 1:4.2-3ubuntu6.30, 1:6.2+dfsg-2ubuntu6.24
qemu (Debian package) - update to 1:3.1+dfsg-8+deb10u5
libslirp (Alpine package) - addressed in versions 4.3.0-r0, 4.3.1-r0
qemu-system-common (Ubuntu package) - update to Ubuntu Pro
qemu-system-mips (Ubuntu package) - addressed in versions Ubuntu Pro (Infra-only), 1:4.2-3ubuntu6.30, 1:6.2+dfsg-2ubuntu6.24, 1:8.2.2+ds-0ubuntu1.4, 1:9.0.2+ds-4ubuntu5.1
qemu-system-arm (Ubuntu package) - addressed in versions Ubuntu Pro (Infra-only), 1:4.2-3ubuntu6.30, 1:6.2+dfsg-2ubuntu6.24, 1:8.2.2+ds-0ubuntu1.4, 1:9.0.2+ds-4ubuntu5.1
qemu-system-misc (Ubuntu package) - addressed in versions Ubuntu Pro (Infra-only), 1:4.2-3ubuntu6.30, 1:6.2+dfsg-2ubuntu6.24, 1:8.2.2+ds-0ubuntu1.4, 1:9.0.2+ds-4ubuntu5.1
qemu-system-ppc (Ubuntu package) - addressed in versions Ubuntu Pro (Infra-only), 1:4.2-3ubuntu6.30, 1:6.2+dfsg-2ubuntu6.24, 1:8.2.2+ds-0ubuntu1.4, 1:9.0.2+ds-4ubuntu5.1
qemu-system-s390x (Ubuntu package) - addressed in versions Ubuntu Pro (Infra-only), 1:4.2-3ubuntu6.30, 1:6.2+dfsg-2ubuntu6.24, 1:8.2.2+ds-0ubuntu1.4, 1:9.0.2+ds-4ubuntu5.1
qemu-system-sparc (Ubuntu package) - addressed in versions Ubuntu Pro (Infra-only), 1:4.2-3ubuntu6.30, 1:6.2+dfsg-2ubuntu6.24, 1:8.2.2+ds-0ubuntu1.4, 1:9.0.2+ds-4ubuntu5.1
qemu-system (Ubuntu package) - addressed in versions Ubuntu Pro (Infra-only), 1:4.2-3ubuntu6.30, 1:6.2+dfsg-2ubuntu6.24, 1:8.2.2+ds-0ubuntu1.4, 1:9.0.2+ds-4ubuntu5.1
qemu-system-x86 (Ubuntu package) - addressed in versions Ubuntu Pro (Infra-only), 1:4.2-3ubuntu6.30, 1:6.2+dfsg-2ubuntu6.24, 1:8.2.2+ds-0ubuntu1.4, 1:9.0.2+ds-4ubuntu5.1
qemu-system-aarch64 (Ubuntu package) - update to Ubuntu Pro (Infra-only)
qemu-kvm (Red Hat package) - update to 1.5.3-175.el7_9.1
qemu-kvm-rhev (Red Hat package) - update to 2.12.0-48.el7_9.2
qemu-kvm-ma (Red Hat package) - update to 2.12.0-48.el7_9.2
libslirp - addressed in versions 4.1.0-2.fc31, 4.2.0-2.fc32
qemu-system-x86-microvm (Ubuntu package) - addressed in versions 1:4.2-3ubuntu6.30, 1:6.2+dfsg-2ubuntu6.24
qemu-system-x86-xen (Ubuntu package) - addressed in versions 1:4.2-3ubuntu6.30, 1:6.2+dfsg-2ubuntu6.24, 1:8.2.2+ds-0ubuntu1.4, 1:9.0.2+ds-4ubuntu5.1
qemu-system-xen (Ubuntu package) - addressed in versions 1:8.2.2+ds-0ubuntu1.4, 1:9.0.2+ds-4ubuntu5.1
Juniper Junos Space - update to 21.2R1

• Exploit #4782 - CVE-2020-1983 () (November 3, 2020)

• https://gitlab.freedesktop.org/slirp/libslirp/-/commit/9ac0371bb8c0a40f5d9f82a1c25129660e81df04
• https://gitlab.freedesktop.org/slirp/libslirp/-/issues/20

• Denial of service in libslirp
• Debian update for qemu
• Arch Linux update for qemu
• OpenSUSE Linux update for slirp4netns
• Ubuntu update for QEMU
• OpenSUSE Linux update for qemu
• Red Hat Enterprise Linux 8 update for the container-tools:rhel8 module
• Use-after-free in libslirp (Alpine package)
• Red Hat Enterprise Linux 7 update for qemu-kvm
• Red Hat Enterprise Linux 8 update for the virt:rhel and virt-devel:rhel modules
• Amazon Linux AMI update for qemu-kvm
• Red Hat Enterprise Linux 7 update for qemu-kvm-ma
• Red Hat Virtualization update for qemu-kvm-rhev
• Multiple vulnerabilities in Junos Space
• Ubuntu update for qemu
• Red Hat OpenStack Platform13 update for qemu-kvm-rhev
• Advanced Virtualization for RHEL 8 update for the virt:8.1 and virt-devel:8.1 modules
• Fedora 32 update for libslirp
• Fedora 31 update for libslirp