Key management errors in heimdal (Alpine package)

1) Key management errors

EUVDB-ID: #VU29242

Risk: Low

CVSSv4.0: 1.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2019-12098

CWE-ID: CWE-320 - Key Management Errors

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a Man-in-the-Middle (MitM) attack.

The vulnerability exists due to Heimdal fails to verify anonymous PKINIT PA-PKINIT-KX key exchange within the krb5_init_creds_step() function in lib/krb5/init_creds_pw.c. A remote attacker can perform a MitM attack against the Heimdal client.

Mitigation

Install update from vendor's website.

Vulnerable software versions

heimdal (Alpine package): 7.1.0-r0 - 7.5.0-r2

CPE2.3

• cpe:2.3:a:alpine:heimdal_alpine_package:7.1.0-r0:*:*:*:*:alpine_linux:*:3.5
• cpe:2.3:a:alpine:heimdal_alpine_package:7.1.0-r1:*:*:*:*:alpine_linux:*:3.5
• cpe:2.3:a:alpine:heimdal_alpine_package:7.1.0-r2:*:*:*:*:alpine_linux:*:3.6

External links

https://git.alpinelinux.org/aports/commit/?id=5949036164c597352ded38bcb5386cc5e4ea273b
https://git.alpinelinux.org/aports/commit/?id=7f6e6b03d2536a389bb79a29915bd3a8fe881517
https://git.alpinelinux.org/aports/commit/?id=c29e49eb3beddab5fba37d37713486319c12df8c
https://git.alpinelinux.org/aports/commit/?id=e8ebbb3123154e0d2dfd574d9eea59dd51ffe205

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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