CVE-2018-0739

Description

Constructed ASN.1 types with a recursive definition (such as can be found in PKCS7) could eventually exceed the stack given malicious input with excessive recursion. This could result in a Denial Of Service attack. There are no such structures used within SSL/TLS that come from untrusted sources so this is considered safe. Fixed in OpenSSL 1.1.0h (Affected 1.1.0-1.1.0g). Fixed in OpenSSL 1.0.2o (Affected 1.0.2b-1.0.2n).

How to fix CVE-2018-0739

To remediate CVE-2018-0739, upgrade the affected package to a fixed version below.

—upgrade to 1.0.2o-r0 or later
—upgrade to 1.18.2-1 or later
—upgrade to 1.1.0h-1 or later
—upgrade to 1.0.1t-1+deb7u4 or later
—upgrade to 1.0.1t-1+deb8u8 or later
—upgrade to 1.0.2l-2+deb9u3 or later

Is CVE-2018-0739 being exploited?

Moderate — EPSS is 14.4%. Track this CVE but it's not at the top of the prioritisation list.

Affected packages (6)

from 0, < 1.0.2o-r0
from 0, < 1.18.2-1
from 0, < 1.1.0h-1
from 0, < 1.0.1t-1+deb7u4
from 0, < 1.0.1t-1+deb8u8
from 0, < 1.0.2l-2+deb9u3

CVSS scores

Source	Version	Severity	Vector
osv	CVSS 3.1	MEDIUM6.5	CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H