Side-channel attack in Libcrypt

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 libgcrypt to version 1.7.8.

Vulnerable software versions

Libgcrypt: 1.7.0 - 1.7.7

CPE2.3

• cpe:2.3:a:gnu:libgcrypt:1.7.0:*:*:*:*:*:*:
• cpe:2.3:a:gnu:libgcrypt:1.7.1:*:*:*:*:*:*:
• cpe:2.3:a:gnu:libgcrypt:1.7.2:*:*:*:*:*:*:

External links

http://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-7526
http://lists.gnupg.org/pipermail/gnupg-announce/2017q2/000408.html

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.