Juniper ScreenOS 6.3.x < 6.3.0r22 Multiple Vulnerabilities in OpenSSL (JSA10733)

This script is Copyright (C) 2016-2017 Tenable Network Security, Inc.


Synopsis :

The remote host is affected by multiple vulnerabilities.

Description :

The version of Juniper ScreenOS running on the remote host is 6.3.x
prior to 6.3.0r22. It is, therefore, affected by multiple
vulnerabilities in its bundled version of OpenSSL :

- A denial of service vulnerability exists due to improper
validation of the content and length of the ASN1_TIME
string by the X509_cmp_time() function. A remote
attacker can exploit this, via a malformed certificate
and CRLs of various sizes, to cause a segmentation
fault, resulting in a denial of service condition. TLS
clients that verify CRLs are affected. TLS clients and
servers with client authentication enabled may be
affected if they use custom verification callbacks.
(CVE-2015-1789)

- A NULL pointer dereference flaw exists in the PKCS#7
parsing code due to incorrect handling of missing inner
'EncryptedContent'. This allows a remote attacker, via
specially crafted ASN.1-encoded PKCS#7 blobs with
missing content, to cause a denial of service condition
or other potential unspecified impacts. (CVE-2015-1790)

- A double-free error exists due to a race condition that
occurs when a NewSessionTicket is received by a
multi-threaded client when attempting to reuse a
previous ticket. A remote attacker can exploit this to
cause a denial of service condition or other potential
unspecified impact. (CVE-2015-1791)

- A flaw exists in the ASN1_TFLG_COMBINE implementation in
file tasn_dec.c related to handling malformed
X509_ATTRIBUTE structures. A remote attacker can exploit
this to cause a memory leak by triggering a decoding
failure in a PKCS#7 or CMS application, resulting in a
denial of service. (CVE-2015-3195)

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

See also :

https://kb.juniper.net/InfoCenter/index?page=content&id=JSA10733
http://www.nessus.org/u?c4eb1929

Solution :

Upgrade to Juniper ScreenOS version 6.3.0r22 or later. Alternatively,
refer to the vendor advisory for additional workarounds.

Risk factor :

Medium / CVSS Base Score : 6.8
(CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P)
CVSS Temporal Score : 5.0
(CVSS2#E:U/RL:OF/RC:C)
Public Exploit Available : false

Family: Firewalls

Nessus Plugin ID: 93383 ()

Bugtraq ID: 75156
75157
75161
78626

CVE ID: CVE-2015-1789
CVE-2015-1790
CVE-2015-1791
CVE-2015-3195

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