Side-channel attack in libgcrypt (Alpine package)

Published: 2017-07-05

Risk	Low
Patch available	YES
Number of vulnerabilities	1
CVE-ID	CVE-2017-7526
CWE-ID	CWE-310
Exploitation vector	Network
Public exploit	N/A
Vulnerable software Subscribe	libgcrypt (Alpine package) Operating systems & Components / Operating system package or component
Vendor	Alpine Linux Development Team

Security Bulletin

This security bulletin contains one low risk vulnerability.

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

Install update from vendor's website.

Vulnerable software versions

libgcrypt (Alpine package): 1.6.6-r0 - 1.7.7-r0

External links

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.