Input validation error in IBM i

1) Input validation error

EUVDB-ID: #VU53609

Risk: Medium

CVSSv3.1: 4.7 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-25217

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack or gain access to sensitive information.

The vulnerability exists due to insufficient validation of options data stored in DHCP leases. A remote attacker can pass specially crafted input to the application and perform a denial of service (DoS) attack or gain access to sensitive information.

Both dhcpd and dhclient are affected by the vulnerability.

Mitigation

Install update from vendor's website.

Vulnerable software versions

IBM i: 7.1 - 7.4

External links

http://www.ibm.com/blogs/psirt/security-bulletin-isc-dhcp-for-ibm-i-is-affected-by-cve-2021-25217/
http://www.ibm.com/support/pages/node/6490433

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

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