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Ubuntu Security Notice USN-4632-1

Ubuntu Security Notice USN-4632-1
Posted Nov 12, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4632-1 - 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 or potentially execute arbitrary code. 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 or potentially execute arbitrary code. Various other issues were also addressed.

tags | advisory, denial of service, overflow, arbitrary
systems | linux, ubuntu
advisories | CVE-2020-7039, CVE-2020-8608
MD5 | 4a371d27b914f9fc59555d745600a57f

Ubuntu Security Notice USN-4632-1

Change Mirror Download
=========================================================================
Ubuntu Security Notice USN-4632-1
November 12, 2020

slirp vulnerabilities
=========================================================================
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
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