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Debian DLA-1015-1 : libgcrypt11 security update

medium Nessus Plugin ID 101274

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Synopsis

The remote Debian host is missing a security update.

Description

It was discovered that there was a key disclosure vulnerability in libgcrypt11 a library of cryptographic routines :

It is well known that constant-time implementations of modular exponentiation cannot use sliding windows. However, software libraries such as Libgcrypt, used by GnuPG, continue to use sliding windows. It is widely believed that, even if the complete pattern of squarings and multiplications is observed through a side-channel attack, the number of exponent bits leaked is not sufficient to carry out a full key-recovery attack against RSA. Specifically, 4-bit sliding windows leak only 40% of the bits, and 5-bit sliding windows leak only 33% of the bits.

-- Sliding right into disaster: Left-to-right sliding windows leak <https://eprint.iacr.org/2017/627>

For Debian 7 'Wheezy', this issue has been fixed in libgcrypt11 version 1.5.0-5+deb7u6.

We recommend that you upgrade your libgcrypt11 packages.

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Solution

Upgrade the affected packages.

See Also

https://eprint.iacr.org/2017/627

https://lists.debian.org/debian-lts-announce/2017/07/msg00007.html

https://packages.debian.org/source/wheezy/libgcrypt11

Plugin Details

Severity: Medium

ID: 101274

File Name: debian_DLA-1015.nasl

Version: 3.7

Type: local

Agent: unix

Published: 7/7/2017

Updated: 1/11/2021

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.2

CVSS v2

Risk Factor: Medium

Base Score: 4.3

Temporal Score: 3.2

Vector: CVSS2#AV:N/AC:M/Au:N/C:P/I:N/A:N

CVSS v3

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5.9

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:debian:debian_linux:7.0, p-cpe:/a:debian:debian_linux:libgcrypt11, p-cpe:/a:debian:debian_linux:libgcrypt11-dbg, p-cpe:/a:debian:debian_linux:libgcrypt11-udeb, p-cpe:/a:debian:debian_linux:libgcrypt11-dev, p-cpe:/a:debian:debian_linux:libgcrypt11-doc

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Ease: No known exploits are available

Patch Publication Date: 7/6/2017

Reference Information

CVE: CVE-2017-7526