OpenSSL 1.0.2 < 1.0.2k Multiple Vulnerabilities

medium Nessus Plugin ID 96873

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Synopsis

A service running on the remote host is affected by multiple vulnerabilities.

Description

According to its banner, the version of OpenSSL running on the remote host is 1.0.2 prior to 1.0.2k. It is, therefore, affected by multiple vulnerabilities :

 - A carry propagation error exists in the Broadwell-specific Montgomery multiplication procedure when handling input lengths divisible by but longer than 256 bits. This can result in transient authentication and key negotiation failures or reproducible erroneous outcomes of public-key operations with specially crafted input. A man-in-the-middle attacker can possibly exploit this issue to compromise ECDH key negotiations that utilize Brainpool P-512 curves. (CVE-2016-7055)

 - An out-of-bounds read error exists when handling packets using the CHACHA20/POLY1305 or RC4-MD5 ciphers. An unauthenticated, remote attacker can exploit this, via specially crafted truncated packets, to cause a denial of service condition. (CVE-2017-3731)

 - A carry propagating error exists in the x86_64 Montgomery squaring implementation that may cause the BN_mod_exp() function to produce incorrect results. An unauthenticated, remote attacker with sufficient resources can exploit this to obtain sensitive information regarding private keys. Note that this issue is very similar to CVE-2015-3193. Moreover, the attacker would additionally need online access to an unpatched system using the target private key in a scenario with persistent DH parameters and a private key that is shared between multiple clients. For example, this can occur by default in OpenSSL DHE based SSL/TLS cipher suites. (CVE-2017-3732)

Solution

Upgrade to OpenSSL version 1.0.2k or later.

See Also

https://www.openssl.org/news/secadv/20170126.txt

Plugin Details

Severity: Medium

ID: 96873

File Name: openssl_1_0_2k.nasl

Version: 1.9

Type: remote

Family: Web Servers

Published: 1/30/2017

Updated: 11/13/2019

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 4.3

Temporal Score: 3.2

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

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

CVSS Score Source: CVE-2017-3732

CVSS v3

Risk Factor: Medium

Base Score: 5.9

Temporal Score: 5.2

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

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

Vulnerability Information

CPE: cpe:/a:openssl:openssl

Required KB Items: openssl/port

Exploit Ease: No known exploits are available

Patch Publication Date: 1/26/2017

Vulnerability Publication Date: 11/10/2016

Reference Information

CVE: CVE-2016-7055, CVE-2017-3731, CVE-2017-3732

BID: 94242, 95813, 95814