Ubuntu update for Libgcrypt

Published: 2017-07-04

Risk	Low
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2017-7526 CVE-2017-9526
CWE-ID	CWE-310
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) Side-channel attack

EUVDB-ID: #VU7276

Risk: Low

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-7526

CWE-ID: CWE-310 - Cryptographic Issues

Exploit availability: No

Description

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

The vulnerability exists in libgcrypt's RSA-1024 implementation using left-to-right method for computing the sliding-window expansion. A remote attacker can perform side-channel attack and gain access to potentially sensitive information.

Mitigation

Update the affected packages.

Ubuntu 17.04:

libgcrypt20 1.7.6-1ubuntu0.1

Ubuntu 16.10:

libgcrypt20 1.7.2-2ubuntu1.1

Ubuntu 16.04 LTS:

libgcrypt20 1.6.5-2ubuntu0.3

Ubuntu 14.04 LTS:

libgcrypt11 1.5.3-2ubuntu4.5

Vulnerable software versions

Ubuntu: 14.04 - 17.04

External links

http://www.ubuntu.com/usn/usn-3347-1/

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) Side-channel attack

EUVDB-ID: #VU7299