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openSUSE 15 Security Update : libgcrypt (openSUSE-SU-2021:2157-1)

high Nessus Plugin ID 151750

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Synopsis

The remote SUSE host is missing a security update.

Description

The remote SUSE Linux SUSE15 host has packages installed that are affected by a vulnerability as referenced in the openSUSE-SU-2021:2157-1 advisory.

 - Libgcrypt before 1.8.8 and 1.9.x before 1.9.3 mishandles ElGamal encryption because it lacks exponent blinding to address a side-channel attack against mpi_powm, and the window size is not chosen appropriately. (There is also an interoperability problem because the selection of the k integer value does not properly consider the differences between basic ElGamal encryption and generalized ElGamal encryption.) This, for example, affects use of ElGamal in OpenPGP. (CVE-2021-33560)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Update the affected packages.

See Also

https://bugzilla.suse.com/1187212

http://www.nessus.org/u?5b2b0388

https://www.suse.com/security/cve/CVE-2021-33560

Plugin Details

Severity: High

ID: 151750

File Name: openSUSE-2021-2157.nasl

Version: 1.2

Type: local

Agent: unix

Published: 7/16/2021

Updated: 7/16/2021

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

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

CVSS Score Source: CVE-2021-33560

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

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

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

Vulnerability Information

CPE: cpe:/o:novell:opensuse:15.3, p-cpe:/a:novell:opensuse:libgcrypt20-hmac, p-cpe:/a:novell:opensuse:libgcrypt20-hmac-32bit, p-cpe:/a:novell:opensuse:libgcrypt20, p-cpe:/a:novell:opensuse:libgcrypt-devel, p-cpe:/a:novell:opensuse:libgcrypt-devel-32bit, p-cpe:/a:novell:opensuse:libgcrypt-cavs, p-cpe:/a:novell:opensuse:libgcrypt20-32bit

Required KB Items: Host/local_checks_enabled, Host/cpu, Host/SuSE/release, Host/SuSE/rpm-list

Exploit Ease: No known exploits are available

Patch Publication Date: 7/11/2021

Vulnerability Publication Date: 6/8/2021

Reference Information

CVE: CVE-2021-33560