Red Hat Virtualization update for openvswitch2.11

1) Use-after-free

EUVDB-ID: #VU55006

Risk: High

CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-36980

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error in decode_NXAST_RAW_ENCAP (called from ofpact_decode and ofpacts_decode) during the decoding of a RAW_ENCAP action. A remote attacker can send a specially crafted request to the system, trigger a use-after-free error and execute arbitrary code.

Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

openvswitch2.11 (Red Hat package): 2.11.3-77.el7fdp - 2.11.3-86.el7fdp

Red Hat Virtualization for IBM Power LE: 4

Red Hat Virtualization: 4

External links

http://access.redhat.com/errata/RHSA-2021:3942

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.