Amazon Linux AMI update for krb5

Published: 2025-02-19

Risk	Medium
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2023-36054 CVE-2023-39975
CWE-ID	CWE-824 CWE-415
Exploitation vector	Network
Public exploit	N/A
Vulnerable software	Amazon Linux AMI Operating systems & Components / Operating system krb5 Operating systems & Components / Operating system package or component
Vendor	Amazon Web Services

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Access of Uninitialized Pointer

EUVDB-ID: #VU79586

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-2023-36054

CWE-ID: CWE-824 - Access of Uninitialized Pointer

Exploit availability: No

Description

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

The vulnerability exists due to the _xdr_kadm5_principal_ent_rec() function in lib/kadm5/kadm_rpc_xdr.c does not validate the relationship between n_key_data and the key_data array count and frees an uninitialized pointer. A remote user can send a specially crafted request to the application and perform a denial of service (DoS) attack.

Mitigation

Update the affected packages:

aarch64:
    krb5-pkinit-debuginfo-1.21-3.amzn2023.0.3.aarch64
    krb5-libs-debuginfo-1.21-3.amzn2023.0.3.aarch64
    libkadm5-debuginfo-1.21-3.amzn2023.0.3.aarch64
    krb5-pkinit-1.21-3.amzn2023.0.3.aarch64
    krb5-server-ldap-1.21-3.amzn2023.0.3.aarch64
    krb5-debuginfo-1.21-3.amzn2023.0.3.aarch64
    krb5-server-1.21-3.amzn2023.0.3.aarch64
    krb5-server-debuginfo-1.21-3.amzn2023.0.3.aarch64
    krb5-server-ldap-debuginfo-1.21-3.amzn2023.0.3.aarch64
    libkadm5-1.21-3.amzn2023.0.3.aarch64
    krb5-workstation-debuginfo-1.21-3.amzn2023.0.3.aarch64
    krb5-debugsource-1.21-3.amzn2023.0.3.aarch64
    krb5-devel-1.21-3.amzn2023.0.3.aarch64
    krb5-libs-1.21-3.amzn2023.0.3.aarch64
    krb5-workstation-1.21-3.amzn2023.0.3.aarch64

src:
    krb5-1.21-3.amzn2023.0.3.src

x86_64:
    libkadm5-debuginfo-1.21-3.amzn2023.0.3.x86_64
    krb5-pkinit-debuginfo-1.21-3.amzn2023.0.3.x86_64
    krb5-server-1.21-3.amzn2023.0.3.x86_64
    krb5-server-ldap-1.21-3.amzn2023.0.3.x86_64
    krb5-server-ldap-debuginfo-1.21-3.amzn2023.0.3.x86_64
    krb5-server-debuginfo-1.21-3.amzn2023.0.3.x86_64
    krb5-workstation-debuginfo-1.21-3.amzn2023.0.3.x86_64
    libkadm5-1.21-3.amzn2023.0.3.x86_64
    krb5-libs-debuginfo-1.21-3.amzn2023.0.3.x86_64
    krb5-debuginfo-1.21-3.amzn2023.0.3.x86_64
    krb5-debugsource-1.21-3.amzn2023.0.3.x86_64
    krb5-devel-1.21-3.amzn2023.0.3.x86_64
    krb5-pkinit-1.21-3.amzn2023.0.3.x86_64
    krb5-libs-1.21-3.amzn2023.0.3.x86_64
    krb5-workstation-1.21-3.amzn2023.0.3.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

krb5: before 1.21-3

CPE2.3

External links

https://alas.aws.amazon.com/AL2023/ALAS-2023-321.html

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.

2) Double Free

EUVDB-ID: #VU79344