CVE-2022-42898

Description

PAC parsing in MIT Kerberos 5 (aka krb5) before 1.19.4 and 1.20.x before 1.20.1 has integer overflows that may lead to remote code execution (in KDC, kadmind, or a GSS or Kerberos application server) on 32-bit platforms (which have a resultant heap-based buffer overflow), and cause a denial of service on other platforms. This occurs in krb5_pac_parse in lib/krb5/krb/pac.c. Heimdal before 7.7.1 has "a similar bug."

How to fix CVE-2022-42898

To remediate CVE-2022-42898, upgrade the affected package to a fixed version below.

—upgrade to 7.7.1-r0 or later
—upgrade to 1.19.4-r0 or later
—upgrade to 4.15.12-r0 or later
—upgrade to 7.7.0+dfsg-2+deb11u2 or later
—upgrade to 1.18.3-6+deb11u3 or later
—upgrade to 1.17-3+deb10u5 or later
—upgrade to 1.18.3-6+deb11u3 or later
—no fix listed

Is CVE-2022-42898 being exploited?

Moderate — EPSS is 10.8%. Track this CVE but it's not at the top of the prioritisation list.

Affected packages (8)

from 0, < 7.7.1-r0
from 0, < 1.19.4-r0
from 0, < 4.15.12-r0
from 0, < 7.7.0+dfsg-2+deb11u2
from 0, < 1.18.3-6+deb11u3
from 0, < 1.17-3+deb10u5
from 0, < 1.18.3-6+deb11u3
from 0

CVSS scores

Source	Version	Severity	Vector
osv	CVSS 3.1	HIGH8.8	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H