CVE-2020-13645

28.05.2020, 12:15

In GNOME glib-networking through 2.64.2, the implementation of GTlsClientConnection skips hostname verification of the server's TLS certificate if the application fails to specify the expected server identity. This is in contrast to its intended documented behavior, to fail the certificate verification. Applications that fail to provide the server identity, including Balsa before 2.5.11 and 2.6.x before 2.6.1, accept a TLS certificate if the certificate is valid for any host.

Provider	Type	Base Score	Atk. Vector	Atk. Complexity	Priv. Required	Vector
NIST	NIST	6.5 MEDIUM	NETWORK	LOW	NONE	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
mitre	CNA	---				---
CVE	ADP	---				---

Base Score

CVSS 3.x

EPSS Score

Percentile: 44%

Vendor	Product	Version
gnome	balsa	𝑥 < 2.5.11
gnome	balsa	2.6.0
gnome	glib-networking	𝑥 < 2.62.4
gnome	glib-networking	2.64.0 ≤ 𝑥 < 2.64.3
canonical	ubuntu_linux	16.04
canonical	ubuntu_linux	18.04
canonical	ubuntu_linux	19.10
canonical	ubuntu_linux	20.04
netapp	cloud_backup	-
broadcom	fabric_operating_system	-

𝑥

= Vulnerable software versions

Debian Releases

Debian Product

Codename

glib-networking

bullseye	2.66.0-2 fixed
bookworm	2.74.0-4 fixed
sid	2.80.0-1 fixed
trixie	2.80.0-1 fixed

Ubuntu Releases

Ubuntu Product

Codename

balsa

focal	Fixed 2.6.0-2ubuntu0.1 released
eoan	Fixed 2.5.6-2ubuntu0.1 released
bionic	not-affected
xenial	not-affected
trusty	dne

glib-networking

focal	Fixed 2.64.2-1ubuntu0.1 released
eoan	Fixed 2.62.1-1ubuntu0.1 released
bionic	Fixed 2.56.0-1ubuntu0.1 released
xenial	Fixed 2.48.2-1~ubuntu16.04.2 released
trusty	dne