Information disclosure in GNOME GLib

Published: 2020-01-16 | Updated: 2020-02-24

Risk	Low
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2020-6750
CWE-ID	CWE-200 CWE-399
Exploitation vector	Network
Public exploit	N/A
Vulnerable software Subscribe	Gnome GLib Universal components / Libraries / Libraries used by multiple products
Vendor	Gnome Development Team

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

Updated: 24.02.2020

Changed bulletin status to patched, updated list of affected and fixed software, added vulnerability #2.

1) Information disclosure

EUVDB-ID: #VU24350

Risk: Low

CVSSv3.1: 2.7 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-6750

CWE-ID: CWE-200 - Information exposure

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to an error within the GSocketClient in GNOME GLib when processing proxy_addr field. A remote attacker force the system to connect to a specific server using a real address instead of pre-configured proxy address and gain knowledge of the victim's real IP address.

Exploitation of the vulnerability is timing-dependent and may occur only sporadically depending on network delays.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Gnome GLib: 2.60.0 - 2.63.5

External links

http://bugzilla.suse.com/show_bug.cgi?id=1160668
http://gitlab.gnome.org/GNOME/glib/issues/1989

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.

2) Resource management error

EUVDB-ID: #VU25564

Risk: Low

CVSSv3.1: 2.9 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: N/A

CWE-ID: CWE-399 - Resource Management Errors

Exploit availability: No

Description

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to relative read when calling the g_printerr() function, which could lead to a denial of service from a setuid-root process being used to block access to the TTY for another user. A local user can block access to TTY for another user.