OpenSSL 1.0.1 < 1.0.1p Multiple Vulnerabilities

Medium Nessus Plugin ID 84636

New! Vulnerability Priority Rating (VPR)

Tenable calculates a dynamic VPR for every vulnerability. VPR combines vulnerability information with threat intelligence and machine learning algorithms to predict which vulnerabilities are most likely to be exploited in attacks. Read more about what VPR is and how it's different from CVSS.

VPR Score: 3.6

Synopsis

The remote host is affected by multiple vulnerabilities.

Description

According to its banner, the remote host is running a version of OpenSSL 1.0.1 prior to 1.0.1p. It is, therefore, affected by the following vulnerabilities :

- A certificate validation bypass vulnerability exists due to a flaw in the X509_verify_cert() function in x509_vfy.c that is triggered when locating alternate certificate chains when the first attempt to build such a chain fails. A remote attacker can exploit this, by using a valid leaf certificate as a certificate authority (CA), to issue invalid certificates that will bypass authentication. Note that this issue affects only versions 1.0.1n and 1.0.1o. (CVE-2015-1793)

- A race condition exists in s3_clnt.c that is triggered when PSK identity hints are incorrectly updated in the parent SSL_CTX structure when they are received by a multi-threaded client. A remote attacker can exploit this, via a crafted ServerKeyExchange message, to cause a double-free memory error, resulting in a denial of service. (CVE-2015-3196)

Solution

Upgrade to OpenSSL version 1.0.1p or later.

See Also

https://www.openssl.org/news/secadv/20150709.txt

https://www.openssl.org/news/secadv/20151203.txt

http://www.nessus.org/u?fcde170c

http://www.nessus.org/u?59729200

Plugin Details

Severity: Medium

ID: 84636

File Name: openssl_1_0_1p.nasl

Version: 1.15

Type: remote

Family: Web Servers

Published: 2015/07/09

Updated: 2019/11/25

Dependencies: 57323

Risk Information

Risk Factor: Medium

VPR Score: 3.6

CVSS Score Source: CVE-2015-1793

CVSS v2.0

Base Score: 6.4

Temporal Score: 5

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

Temporal Vector: CVSS2#E:POC/RL:OF/RC:C

CVSS v3.0

Base Score: 6.5

Temporal Score: 5.9

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

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

Vulnerability Information

CPE: cpe:/a:openssl:openssl

Required KB Items: openssl/port

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 2015/07/09

Vulnerability Publication Date: 2015/07/09

Reference Information

CVE: CVE-2015-1793, CVE-2015-3196

BID: 75652