Amazon Linux AMI update for libgcrypt, gnupg

1) Libgcrypt weak encryption

EUVDB-ID: #VU327

Risk: Low

CVSSv4.0: 0.4 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2016-6313

CWE-ID: CWE-330 - Use of Insufficiently Random Values

Exploit availability: No

Description

The vulnerability allows a local user to decrypt data.

The vulnerability exists in the Libgcrypt library due to weak implementation of random number generator. A local user, who can obtain 4640 bits from random generator, can predict the next 160 bits of output.

Successful exploitation of this vulnerability may result in generation of weak encryption keys and may lead to sensitive information disclosure.

 

Mitigation

Update the affected packages.

i686:
    libgcrypt-devel-1.5.3-12.19.amzn1.i686
    libgcrypt-1.5.3-12.19.amzn1.i686
    libgcrypt-debuginfo-1.5.3-12.19.amzn1.i686
    gnupg-debuginfo-1.4.19-1.28.amzn1.i686
    gnupg-1.4.19-1.28.amzn1.i686

src:
    libgcrypt-1.5.3-12.19.amzn1.src
    gnupg-1.4.19-1.28.amzn1.src

x86_64:
    libgcrypt-devel-1.5.3-12.19.amzn1.x86_64
    libgcrypt-1.5.3-12.19.amzn1.x86_64
    libgcrypt-debuginfo-1.5.3-12.19.amzn1.x86_64
    gnupg-debuginfo-1.4.19-1.28.amzn1.x86_64
    gnupg-1.4.19-1.28.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

CPE2.3

• cpe:2.3:o:amazon_web_services:amazon_linux_ami:*:*:*:*:*:*:*:*

External links

https://alas.aws.amazon.com/ALAS-2016-744.html

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

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