Denial of service in PowerSC

1) NULL pointer dereference

EUVDB-ID: #VU56828

Risk: Medium

CVSSv4.0: 4.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-37750

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

Description

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

The vulnerability exists due to a NULL pointer dereference error in the Key Distribution Center (KDC) in kdc/do_tgs_req.c. A remote user can pass specially crafted data via the FAST inner body that lacks a server field, trigger a NULL pointer dereference error and perform a denial of service (DoS) attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

PowerSC: 1.3 - 2.1

CPE2.3

• cpe:2.3:o:ibm_corporation:powersc:1.3:*:*:*:*:*:*:*
• cpe:2.3:o:ibm_corporation:powersc:2.0:*:*:*:*:*:*:*
• cpe:2.3:o:ibm_corporation:powersc:2.1:*:*:*:*:*:*:*

External links

https://www.ibm.com/blogs/psirt/security-bulletin-vulnerability-in-mit-kerberos-5-affects-powersc-cve-2021-37750/
https://www.ibm.com/support/pages/node/6619835

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

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