SUSE update for krb5

1) NULL pointer dereference

EUVDB-ID: #VU56828

Risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

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

Update the affected package krb5 to the latest version.

Vulnerable software versions

SUSE MicroOS: 5.0

SUSE Linux Enterprise Module for Server Applications: 15-SP2 - 15-SP3

SUSE Linux Enterprise Module for Basesystem: 15-SP2 - 15-SP3

krb5-32bit-debuginfo: before 1.16.3-3.24.1

krb5-32bit: before 1.16.3-3.24.1

krb5-plugin-preauth-pkinit-debuginfo: before 1.16.3-3.24.1

krb5-plugin-preauth-pkinit: before 1.16.3-3.24.1

krb5-plugin-preauth-otp-debuginfo: before 1.16.3-3.24.1

krb5-plugin-preauth-otp: before 1.16.3-3.24.1

krb5-devel: before 1.16.3-3.24.1

krb5-client-debuginfo: before 1.16.3-3.24.1

krb5-client: before 1.16.3-3.24.1

krb5-server-debuginfo: before 1.16.3-3.24.1

krb5-server: before 1.16.3-3.24.1

krb5-plugin-kdb-ldap-debuginfo: before 1.16.3-3.24.1

krb5-plugin-kdb-ldap: before 1.16.3-3.24.1

krb5-debugsource: before 1.16.3-3.24.1

krb5-debuginfo: before 1.16.3-3.24.1

krb5: before 1.16.3-3.24.1

CPE2.3

• cpe:2.3:o:suse:suse_microos:5.0:*:*:*:*:*:*:
• cpe:2.3:o:suse:suse_linux_enterprise_module_for_server_applications:15-SP2:*:*:*:*:*:*:
• cpe:2.3:o:suse:suse_linux_enterprise_module_for_server_applications:15-SP3:*:*:*:*:*:*:
• cpe:2.3:o:suse:suse_linux_enterprise_module_for_basesystem:15-SP3:*:*:*:*:*:*:
• cpe:2.3:o:suse:suse_linux_enterprise_module_for_basesystem:15-SP2:*:*:*:*:*:*:

External links

http://www.suse.com/support/update/announcement/2021/suse-su-20213454-1/

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.