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Vulnerability of SLiRP: buffer overflow via tcp_emu

Synthesis of the vulnerability 

An attacker, inside a guest system, can trigger a buffer overflow via tcp_emu() of SLiRP, in order to trigger a denial of service, and possibly to run code on the host system.
Vulnerable products: Debian, QEMU, RHEL, Ubuntu.
Severity of this weakness: 2/4.
Creation date: 16/01/2020.
Références of this bulletin: CVE-2020-7039, DLA-2076-1, DLA-2090-1, DSA-4616-1, RHSA-2020:0348-01, RHSA-2020:0775-01, RHSA-2020:0889-01, RHSA-2020:1116-01, RHSA-2020:1150-01, USN-4283-1, VIGILANCE-VUL-31350.

Description of the vulnerability 

An attacker, inside a guest system, can trigger a buffer overflow via tcp_emu() of SLiRP, in order to trigger a denial of service, and possibly to run code on the host system.
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This cybersecurity threat impacts software or systems such as Debian, QEMU, RHEL, Ubuntu.

Our Vigil@nce team determined that the severity of this computer threat note is medium.

The trust level is of type confirmed by the editor, with an origin of user shell.

An attacker with a expert ability can exploit this security threat.

Solutions for this threat 

Debian 8: new qemu packages.
New packages are available:
  Debian 8: qemu 1:2.1+dfsg-12+deb8u13

Debian 8: new slirp packages.
New packages are available:
  Debian 8: slirp 1:1.0.17-7+deb8u1

Debian 9/10: new qemu packages.
New packages are available:
  Debian 9: qemu 1:2.8+dfsg-6+deb9u9
  Debian 10: qemu 1:3.1+dfsg-8+deb10u4

QEMU: patch for SLiRP tcp_emu.
A patch is available:
  https://gitlab.freedesktop.org/slirp/libslirp/commit/2655fffed7a9e765bcb4701dd876e9dab975f289
  https://gitlab.freedesktop.org/slirp/libslirp/commit/ce131029d6d4a405cb7d3ac6716d03e58fb4a5d9
  https://gitlab.freedesktop.org/slirp/libslirp/commit/82ebe9c370a0e2970fb5695aa19aa5214a6a1c80

RHEL 6.10: new qemu-kvm packages.
New packages are available:
  RHEL 6.10: qemu-kvm 0.12.1.2-2.506.el6_10.6

RHEL 7: new qemu-kvm-ma packages.
New packages are available:
  RHEL 7.0-7.7: qemu-kvm-ma 2.12.0-44.el7

RHEL 7: new qemu-kvm packages.
New packages are available:
  RHEL 7.0-7.7: qemu-kvm 1.5.3-173.el7

RHEL 7: new slirp4netns packages.
New packages are available:
  RHEL 7.7: slirp4netns 0.3.0-8.el7_7

RHEL 8.1: new container-tools-rhel8 module.
The following module is updated:
  RHEL 8.1 Module: container-tools:rhel8

Ubuntu: new qemu packages.
New packages are available:
  Ubuntu 19.10: qemu 1:4.0+dfsg-0ubuntu9.4
  Ubuntu 18.04 LTS: qemu 1:2.11+dfsg-1ubuntu7.23
  Ubuntu 16.04 LTS: qemu 1:2.5+dfsg-5ubuntu10.43

Wind River Linux: version 10.17.41.20.
The version 10.17.41.20 is fixed:
  https://support2.windriver.com/

Wind River Linux: version 10.18.44.15.
The version 10.18.44.15 is fixed:
  https://support2.windriver.com/
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