Amazon Linux 2 : nspr (ALAS-2020-1559)

critical Nessus Plugin ID 142720
New! Plugin Severity Now Using CVSS v3

The calculated severity for Plugins has been updated to use CVSS v3 by default. Plugins that do not have a CVSS v3 score will fall back to CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

Synopsis

The remote Amazon Linux 2 host is missing a security update.

Description

The version of tested product installed on the remote host is prior to tested version. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2020-1559 advisory.

- When importing a curve25519 private key in PKCS#8format with leading 0x00 bytes, it is possible to trigger an out-of-bounds read in the Network Security Services (NSS) library. This could lead to information disclosure. This vulnerability affects Firefox ESR < 60.8, Firefox < 68, and Thunderbird < 60.8.
(CVE-2019-11719)

- A vulnerability exists where it possible to force Network Security Services (NSS) to sign CertificateVerify with PKCS#1 v1.5 signatures when those are the only ones advertised by server in CertificateRequest in TLS 1.3. PKCS#1 v1.5 signatures should not be used for TLS 1.3 messages. This vulnerability affects Firefox < 68. (CVE-2019-11727)

- Improper refcounting of soft token session objects could cause a use-after-free and crash (likely limited to a denial of service). This vulnerability affects Firefox < 71. (CVE-2019-11756)

- In Network Security Services (NSS) before 3.46, several cryptographic primitives had missing length checks. In cases where the application calling the library did not perform a sanity check on the inputs it could result in a crash due to a buffer overflow. (CVE-2019-17006)

- After a HelloRetryRequest has been sent, the client may negotiate a lower protocol that TLS 1.3, resulting in an invalid state transition in the TLS State Machine. If the client gets into this state, incoming Application Data records will be ignored. This vulnerability affects Firefox < 72. (CVE-2019-17023)

- When converting coordinates from projective to affine, the modular inversion was not performed in constant time, resulting in a possible timing-based side channel attack. This vulnerability affects Firefox < 80 and Firefox for Android < 80. (CVE-2020-12400)

- During ECDSA signature generation, padding applied in the nonce designed to ensure constant-time scalar multiplication was removed, resulting in variable-time execution dependent on secret data. This vulnerability affects Firefox < 80 and Firefox for Android < 80. (CVE-2020-12401)

- During RSA key generation, bignum implementations used a variation of the Binary Extended Euclidean Algorithm which entailed significantly input-dependent flow. This allowed an attacker able to perform electromagnetic-based side channel attacks to record traces leading to the recovery of the secret primes.
*Note:* An unmodified Firefox browser does not generate RSA keys in normal operation and is not affected, but products built on top of it might. This vulnerability affects Firefox < 78. (CVE-2020-12402)

- When performing EC scalar point multiplication, the wNAF point multiplication algorithm was used; which leaked partial information about the nonce used during signature generation. Given an electro-magnetic trace of a few signature generations, the private key could have been computed. This vulnerability affects Firefox < 80 and Firefox for Android < 80. (CVE-2020-6829)

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

Solution

Run 'yum update nspr' to update your system.
Run 'yum update nss-softokn' to update your system.
Run 'yum update nss-util' to update your system.
Run 'yum update nss' to update your system.

See Also

https://alas.aws.amazon.com/AL2/ALAS-2020-1559.html

https://access.redhat.com/security/cve/CVE-2019-11719

https://access.redhat.com/security/cve/CVE-2019-11727

https://access.redhat.com/security/cve/CVE-2019-11756

https://access.redhat.com/security/cve/CVE-2019-17006

https://access.redhat.com/security/cve/CVE-2019-17023

https://access.redhat.com/security/cve/CVE-2020-12400

https://access.redhat.com/security/cve/CVE-2020-12401

https://access.redhat.com/security/cve/CVE-2020-12402

https://access.redhat.com/security/cve/CVE-2020-12403

https://access.redhat.com/security/cve/CVE-2020-6829

Plugin Details

Severity: Critical

ID: 142720

File Name: al2_ALAS-2020-1559.nasl

Version: 1.2

Type: local

Agent: unix

Published: 11/11/2020

Updated: 11/11/2020

Dependencies: ssh_get_info.nasl

Risk Information

CVSS Score Source: CVE-2019-17006

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.4

Vector: AV:N/AC:L/Au:N/C:C/I:C/A:C

Temporal Vector: E:U/RL:OF/RC:C

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

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

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

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:nspr, p-cpe:/a:amazon:linux:nspr-debuginfo, p-cpe:/a:amazon:linux:nspr-devel, p-cpe:/a:amazon:linux:nss, p-cpe:/a:amazon:linux:nss-debuginfo, p-cpe:/a:amazon:linux:nss-devel, p-cpe:/a:amazon:linux:nss-pkcs11-devel, p-cpe:/a:amazon:linux:nss-softokn, p-cpe:/a:amazon:linux:nss-softokn-debuginfo, p-cpe:/a:amazon:linux:nss-softokn-devel, p-cpe:/a:amazon:linux:nss-softokn-freebl, p-cpe:/a:amazon:linux:nss-softokn-freebl-devel, p-cpe:/a:amazon:linux:nss-sysinit, p-cpe:/a:amazon:linux:nss-tools, p-cpe:/a:amazon:linux:nss-util, p-cpe:/a:amazon:linux:nss-util-debuginfo, p-cpe:/a:amazon:linux:nss-util-devel, cpe:/o:amazon:linux:2

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

Exploit Ease: No known exploits are available

Patch Publication Date: 11/9/2020

Vulnerability Publication Date: 7/9/2019

Reference Information

CVE: CVE-2019-11719, CVE-2019-11727, CVE-2019-11756, CVE-2019-17006, CVE-2019-17023, CVE-2020-6829, CVE-2020-12400, CVE-2020-12401, CVE-2020-12402, CVE-2020-12403

BID: 109086, 109085

ALAS: 2020-1559