Denial of service in Open vSwitch (OVS)

1) Memory leak

EUVDB-ID: #VU73248

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-3905

CWE-ID: CWE-401 - Missing release of memory after effective lifetime

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform DoS attack on the target system.

The vulnerability exists due memory leak in lib/ipf.c during userspace IP fragmentation processing. A remote attacker can send specially crafted packet fragments to the system to trigger memory leak and perform denial of service attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Open vSwitch: 2.12.0 - 2.16.0

CPE2.3

• cpe:2.3:h:openvswitch.org:openvswitch:2.16.0:*:*:*:*:*:*:*

External links

https://bugzilla.redhat.com/show_bug.cgi?id=2019692
https://ubuntu.com/security/CVE-2021-3905
https://access.redhat.com/security/cve/CVE-2021-3905
https://github.com/openvswitch/ovs-issues/issues/226
https://github.com/openvswitch/ovs/commit/803ed12e31b0377c37d7aa8c94b3b92f2081e349

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.