Vulnerability identifier: #VU30571

Vulnerability risk: Low

CVSSv3.1: 3.7 [CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2014-3591

CWE-ID: CWE-200

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
GnuPG
Client/Desktop applications / Encryption software

Vendor: GNU

Description

The vulnerability allows a local non-authenticated attacker to gain access to sensitive information.

Libgcrypt before 1.6.3 and GnuPG before 1.4.19 does not implement ciphertext blinding for Elgamal decryption, which allows physically proximate attackers to obtain the server's private key by determining factors using crafted ciphertext and the fluctuations in the electromagnetic field during multiplication.

Mitigation
Install update from vendor's website.

Vulnerable software versions

GnuPG: 1.4.0 - 1.4.18

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External links
http://www.cs.tau.ac.il/~tromer/radioexp/
http://www.debian.org/security/2015/dsa-3184
http://www.debian.org/security/2015/dsa-3185
http://lists.gnupg.org/pipermail/gnupg-announce/2015q1/000363.html
http://lists.gnupg.org/pipermail/gnupg-announce/2015q1/000364.html

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Q & A

Can this vulnerability be exploited remotely?

No. The attacker should have physical access to the system in order to successfully exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.