Input validation error in IBM i

1) Input validation error

EUVDB-ID: #VU53609

Risk: Medium

CVSSv4.0: 1.3 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

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

CPE2.3

• cpe:2.3:o:ibm_corporation:ibm_i:7.1:*:*:*:*:*:*:*
• cpe:2.3:o:ibm_corporation:ibm_i:7.2:*:*:*:*:*:*:*
• cpe:2.3:o:ibm_corporation:ibm_i:7.3:*:*:*:*:*:*:*

External links

https://www.ibm.com/blogs/psirt/security-bulletin-isc-dhcp-for-ibm-i-is-affected-by-cve-2021-25217/
https://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.