NULL pointer dereference in krb5 (Alpine package)

1) NULL pointer dereference

EUVDB-ID: #VU32306

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2015-8630

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

Description

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

The vulnerability exists due to a NULL pointer dereference error in lib/kadm5/srv/svr_principal.c in kadmind in MIT Kerberos 5 (aka krb5) 1.12.x and 1.13.x before 1.13.4 and 1.14.x before 1.14.1 allow remote authenticated users to cause a denial of service (NULL pointer dereference and daemon crash) by specifying KADM5_POLICY with a NULL policy name. <a href="http://cwe.mitre.org/data/definitions/476. A remote attacker can perform a denial of service (DoS) attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

krb5 (Alpine package): 1.12.4-r0

CPE2.3

• cpe:2.3:a:alpine:krb5_alpine_package:1.12.4-r0:*:*:*:*:alpine_linux:*:2.7

External links

https://git.alpinelinux.org/aports/commit/?id=5dfc3609c83443f92ad4f2deb320e2e4e8a711bd
https://git.alpinelinux.org/aports/commit/?id=4f2cf5fbbec2789b0e103ff0eb4104ea870841b1
https://git.alpinelinux.org/aports/commit/?id=5e3bdd5e3d1bbd6ec59d091da48d09abd09989bc
https://git.alpinelinux.org/aports/commit/?id=9fae6fa0a6bda24c7af622a7e5b5f3bed7e8207b
https://git.alpinelinux.org/aports/commit/?id=eab4343d4108ba85530b8141ae3fe0a2242cd72b

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.