Ubuntu update for GnuTLS

Published: 2017-06-13

Risk	Medium
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2017-7507 CVE-2017-7869
CWE-ID	CWE-476 CWE-119
Exploitation vector	Network
Public exploit	N/A
Vulnerable software Subscribe	Ubuntu Operating systems & Components / Operating system
Vendor	Canonical Ltd.

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Null pointer dereference

EUVDB-ID: #VU7481

Risk: Medium

CVSSv3.1: 5.1 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-7507

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

Description

The vulnerability allows a remote attacker to cause DoS condition on the target system.

The weakness exists due to NULL pointer dereference while decoding a status response TLS extension with valid contents. A remote attacker can send specially crafted status_request extension in a ClientHello message to cause the GnuTLS server application to crash.

Successful exploitation of the vulnerability results in denial of service.

Mitigation

Update the affected packages

Ubuntu 17.04:

libgnutls30 3.5.6-4ubuntu4.1

Ubuntu 16.10:

libgnutls30 3.5.3-5ubuntu1.2

Ubuntu 16.04 LTS:

libgnutls30 3.4.10-4ubuntu1.3

Ubuntu 14.04 LTS:

libgnutls26 2.12.23-12ubuntu2.8

Vulnerable software versions

Ubuntu: 14.04 - 17.04

External links

http://www.ubuntu.com/usn/usn-3318-1/

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) Denial of service

EUVDB-ID: #VU7661