[ASA-202107-40] openvswitch: arbitrary code execution

[Jonas Witschel]

Arch Linux Security Advisory ASA-202107-40
==========================================

Severity: Medium
Date    : 2021-07-20
CVE-ID  : CVE-2021-36980
Package : openvswitch
Type    : arbitrary code execution
Remote  : No
Link    : https://security.archlinux.org/AVG-2177

Summary
=======

The package openvswitch before version 2.15.1-1 is vulnerable to
arbitrary code execution.

Resolution
==========

Upgrade to 2.15.1-1.

# pacman -Syu "openvswitch>=2.15.1-1"

The problem has been fixed upstream in version 2.15.1.

Workaround
==========

None.

Description
===========

Open vSwitch (aka openvswitch) 2.11.0 through 2.15.0 has a use-after-
free in decode_NXAST_RAW_ENCAP (called from ofpact_decode and
ofpacts_decode) during the decoding of a RAW_ENCAP action.

Impact
======

An attacker could execute arbitrary code through crafted Open vSwitch
Actions.

References
==========

https://github.com/google/oss-fuzz-vulns/blob/main/vulns/openvswitch/OSV-2020-2197.yaml
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=27851
https://github.com/openvswitch/ovs/commit/38744b1bcb022c611712527f039722115300f58f
https://security.archlinux.org/CVE-2021-36980
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