A SLiRP security update has been released for Ubuntu 16.04 LTS and 18.04 LTS.

USN-4632-1: SLiRP vulnerabilities

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Ubuntu Security Notice USN-4632-1
November 12, 2020

slirp vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

slirp could be made to crash if it received specially crafted
input.

Software Description:
- slirp: SLIP/PPP emulator using a dial up shell account

Details:

It was discovered that the SLiRP networking implementation of the QEMU
emulator did not properly manage memory under certain circumstances. An
attacker could use this to cause a heap-based buffer overflow or other out-
of-bounds access, which can lead to a denial of service (application crash)
or potentially execute arbitrary code. (CVE-2020-7039)

It was discovered that the SLiRP networking implementation of the QEMU
emulator misuses snprintf return values. An attacker could use this to
cause a denial of service (application crash) or potentially execute
arbitrary code. (CVE-2020-8608)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 18.04 LTS:
slirp 1:1.0.17-8ubuntu18.04.1

Ubuntu 16.04 LTS:
slirp 1:1.0.17-8ubuntu16.04.1

In general, a standard system update will make all the necessary changes.

References:
  https://usn.ubuntu.com/4632-1
CVE-2020-7039, CVE-2020-8608

Package Information:
  https://launchpad.net/ubuntu/+source/slirp/1:1.0.17-8ubuntu18.04.1
  https://launchpad.net/ubuntu/+source/slirp/1:1.0.17-8ubuntu16.04.1