AIX OpenSSL Advisory : openssl_advisory18.asc / openssl_advisory19.asc (DROWN)

Critical Nessus Plugin ID 90448

Synopsis

The remote AIX host has a version of OpenSSL installed that is affected by multiple vulnerabilities.

Description

The version of OpenSSL installed on the remote AIX host is affected by the following vulnerabilities :

- A key disclosure vulnerability exists due to improper handling of cache-bank conflicts on the Intel Sandy-bridge microarchitecture. An attacker can exploit this to gain access to RSA key information.
(CVE-2016-0702)

- A double-free error exists due to improper validation of user-supplied input when parsing malformed DSA private keys. A remote attacker can exploit this to corrupt memory, resulting in a denial of service condition or the execution of arbitrary code. (CVE-2016-0705)

- A NULL pointer dereference flaw exists in the BN_hex2bn() and BN_dec2bn() functions. A remote attacker can exploit this to trigger a heap corruption, resulting in the execution of arbitrary code. (CVE-2016-0797)

- A denial of service vulnerability exists due to improper handling of invalid usernames. A remote attacker can exploit this, via a specially crafted username, to leak 300 bytes of memory per connection, exhausting available memory resources. (CVE-2016-0798)

- Multiple memory corruption issues exist that allow a remote attacker to cause a denial of service condition or the execution of arbitrary code. (CVE-2016-0799)

- A flaw exists that allows a cross-protocol Bleichenbacher padding oracle attack known as DROWN (Decrypting RSA with Obsolete and Weakened eNcryption).
This vulnerability exists due to a flaw in the Secure Sockets Layer Version 2 (SSLv2) implementation, and it allows captured TLS traffic to be decrypted. A man-in-the-middle attacker can exploit this to decrypt the TLS connection by utilizing previously captured traffic and weak cryptography along with a series of specially crafted connections to an SSLv2 server that uses the same private key. (CVE-2016-0800)

- A denial of service vulnerability exists due to improper verification of memory allocation by the doapr_outch() function in file crypto/bio/b_print.c. A remote attacker can exploit this, via a specially crafted string, to write data out-of-bounds or exhaust memory resources or possibly have other unspecified impact. (CVE-2016-2842)

Solution

A fix is available and can be downloaded from the IBM AIX website.

See Also

http://aix.software.ibm.com/aix/efixes/security/openssl_advisory18.asc

http://aix.software.ibm.com/aix/efixes/security/openssl_advisory19.asc

https://www.drownattack.com/drown-attack-paper.pdf

https://drownattack.com/

https://www.openssl.org/news/secadv/20160301.txt

Plugin Details

Severity: Critical

ID: 90448

File Name: aix_openssl_advisory18.nasl

Version: $Revision: 1.9 $

Type: local

Published: 2016/04/13

Modified: 2016/05/16

Dependencies: 12634

Risk Information

Risk Factor: Critical

CVSSv2

Base Score: 10

Temporal Score: 7.4

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

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

Vulnerability Information

CPE: cpe:/o:ibm:aix, cpe:/a:openssl:openssl

Required KB Items: Host/AIX/lslpp, Host/local_checks_enabled, Host/AIX/version

Exploit Available: false

Exploit Ease: No known exploits are available

Patch Publication Date: 2016/04/04

Vulnerability Publication Date: 2016/02/24

Reference Information

CVE: CVE-2016-0702, CVE-2016-0705, CVE-2016-0797, CVE-2016-0798, CVE-2016-0799, CVE-2016-0800, CVE-2016-2842

OSVDB: 134973, 135095, 135096, 135121, 135149, 135150, 135151

CERT: 583776