#VU70879 NULL pointer dereference in Net-snmp - CVE-2022-44793

Vulnerability identifier: #VU70879

Vulnerability risk: Medium

CVSSv4.0: 7.7 [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:P/U:Green]

CVE-ID: CVE-2022-44793

CWE-ID: CWE-476

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
Net-snmp
Server applications / Remote management servers, RDP, SSH

Vendor: net-snmp.sourceforge.net

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a NULL pointer dereference error within the handle_ipv6IpForwarding() function in agent/mibgroup/ip-mib/ip_scalars.c. A remote attacker can send specially crafted UDP packets to the application and perform a denial of service (DoS) attack.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Net-snmp: 5.4.3 rc1 - 5.9.3

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External links
https://github.com/net-snmp/net-snmp/issues/475
https://gist.github.com/menglong2234/d07a65b5028145c9f4e1d1db8c4c202f

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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. However, proof of concept for this vulnerability is available.