Information disclosure in GNU GnuPG

1) Information disclosure

EUVDB-ID: #VU30571

Risk: Low

CVSSv4.0: 0.6 [CVSS:4.0/AV:P/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2014-3591

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor

Exploit availability: No

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

CPE2.3

• cpe:2.3:a:gnu:gnupg:1.4.0:*:*:*:*:*:*:*
• cpe:2.3:a:gnu:gnupg:1.4.1:*:*:*:*:*:*:*
• cpe:2.3:a:gnu:gnupg:1.4.2:*:*:*:*:*:*:*

External links

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

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.