Permissions, Privileges, and Access Controls in krb5 (Alpine package)

1) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU32374

Risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2015-2694

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to read and manipulate data.

The kdcpreauth modules in MIT Kerberos 5 (aka krb5) 1.12.x and 1.13.x before 1.13.2 do not properly track whether a client's request has been validated, which allows remote attackers to bypass an intended preauthentication requirement by providing (1) zero bytes of data or (2) an arbitrary realm name, related to plugins/preauth/otp/main.c and plugins/preauth/pkinit/pkinit_srv.c.

Mitigation

Install update from vendor's website.

Vulnerable software versions

krb5 (Alpine package): 1.12.1-r1

CPE2.3

• cpe:2.3:a:alpine:krb5_alpine_package:1.12.1-r1:*:*:*:*:alpine_linux:*:2.7

External links

https://git.alpinelinux.org/aports/commit/?id=fdc57cf10ba6dc021e62e0f666912ce98100b514
https://git.alpinelinux.org/aports/commit/?id=f9f0307cf4d91055a8dffc51c7082e28f0df3e81
https://git.alpinelinux.org/aports/commit/?id=4b6e93b289ac9264c1bf81d41628b80f82d8cfe0

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.