Tenable Passive Vulnerability Scanner 5.x < 5.2.0 Multiple Vulnerabilities (SWEET32)

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


Synopsis :

A vulnerability scanner installed on the remote host is affected by
multiple vulnerabilities.

Description :

The version of Tenable Passive Vulnerability Scanner (PVS) installed
on the remote host is 5.x < 5.2.0. It is, therefore, affected by
multiple vulnerabilities :

- Multiple denial of service vulnerabilities exist in
Expat within file xmlparse.c due to a logical error in
hash computations. An unauthenticated, remote attacker
can exploit these, via a specially crafted XML file
containing many identifiers with the same value, to
cause the service to exhaust CPU resources.
(CVE-2012-0876, CVE-2016-5300)

- A flaw exists in the generate_hash_secret_salt()
function in file lib/xmlparse.c within Expat due to the
generation of non-random output by the PRNG. An
unauthenticated, remote attacker can exploit this to
more easily predict the PRNG output. (CVE-2012-6702)

- Multiple buffer overflow conditions exist within Expat,
specifically in the XML_GetBuffer() function in file
lib/xmlparse.c, due to improper validation of
user-supplied input when handling compressed XML
content. An unauthenticated, remote attacker can exploit
these to execute arbitrary code. (CVE-2015-1283,
CVE-2016-4472)

- Multiple buffer overflow conditions exist within the
Expat XML parser when handling malformed input documents
due to improper validation of user-supplied input. An
unauthenticated, remote attacker can exploit these to
cause a denial of service condition or the execution of
arbitrary code. (CVE-2016-0718, CVE-2016-0719)

- Multiple integer overflow conditions exist in s3_srvr.c,
ssl_sess.c, and t1_lib.c due to improper use of pointer
arithmetic for heap-buffer boundary checks. An
unauthenticated, remote attacker can exploit these to
cause a denial of service. (CVE-2016-2177)

- An information disclosure vulnerability exists in the
dsa_sign_setup() function in dsa_ossl.c due to a failure
to properly ensure the use of constant-time operations.
An unauthenticated, remote attacker can exploit this,
via a timing side-channel attack, to disclose DSA key
information. (CVE-2016-2178)

- A denial of service vulnerability exists in the DTLS
implementation due to a failure to properly restrict the
lifetime of queue entries associated with unused
out-of-order messages. An unauthenticated, remote
attacker can exploit this, by maintaining multiple
crafted DTLS sessions simultaneously, to exhaust memory.
(CVE-2016-2179)

- An out-of-bounds read error exists in the X.509 Public
Key Infrastructure Time-Stamp Protocol (TSP)
implementation. An unauthenticated, remote attacker can
exploit this, via a crafted time-stamp file that is
mishandled by the 'openssl ts' command, to cause
denial of service or to disclose sensitive information.
(CVE-2016-2180)

- A denial of service vulnerability exists in the
Anti-Replay feature in the DTLS implementation due to
improper handling of epoch sequence numbers in records.
An unauthenticated, remote attacker can exploit this,
via spoofed DTLS records, to cause legitimate packets to
be dropped. (CVE-2016-2181)

- An overflow condition exists in the BN_bn2dec() function
in bn_print.c due to improper validation of
user-supplied input when handling BIGNUM values. An
unauthenticated, remote attacker can exploit this to
crash the process. (CVE-2016-2182)

- A vulnerability exists, known as SWEET32, in the 3DES
and Blowfish algorithms due to the use of weak 64-bit
block ciphers by default. A man-in-the-middle attacker
who has sufficient resources can exploit this
vulnerability, via a 'birthday' attack, to detect a
collision that leaks the XOR between the fixed secret
and a known plaintext, allowing the disclosure of the
secret text, such as secure HTTPS cookies, and possibly
resulting in the hijacking of an authenticated session.
(CVE-2016-2183)

- An flaw exists in SQLite due to the use of insecure
temporary directories. A local attacker can exploit this
to cause a denial of service condition or possibly have
other more severe impact. (CVE-2016-6153)

- A flaw exists in the tls_decrypt_ticket() function in
t1_lib.c due to improper handling of ticket HMAC
digests. An unauthenticated, remote attacker can exploit
this, via a ticket that is too short, to crash the
process, resulting in a denial of service.
(CVE-2016-6302)

- An integer overflow condition exists in the
MDC2_Update() function in mdc2dgst.c due to improper
validation of user-supplied input. An unauthenticated,
remote attacker can exploit this to cause a heap-based
buffer overflow, resulting in a denial of service
condition or possibly the execution of arbitrary code.
(CVE-2016-6303)

- A flaw exists in the ssl_parse_clienthello_tlsext()
function in t1_lib.c due to improper handling of overly
large OCSP Status Request extensions from clients. An
unauthenticated, remote attacker can exploit this, via
large OCSP Status Request extensions, to exhaust memory
resources, resulting in a denial of service condition.
(CVE-2016-6304)

- A flaw exists in the SSL_peek() function in
rec_layer_s3.c due to improper handling of empty
records. An unauthenticated, remote attacker can exploit
this, by triggering a zero-length record in an SSL_peek
call, to cause an infinite loop, resulting in a denial
of service condition. (CVE-2016-6305)

- An out-of-bounds read error exists in the certificate
parser that allows an unauthenticated, remote attacker
to cause a denial of service via crafted certificate
operations. (CVE-2016-6306)

- A denial of service vulnerability exists in the
state-machine implementation due to a failure to check
for an excessive length before allocating memory. An
unauthenticated, remote attacker can exploit this, via a
crafted TLS message, to exhaust memory resources.
(CVE-2016-6307)

- A denial of service vulnerability exists in the DTLS
implementation due to improper handling of excessively
long DTLS messages. An unauthenticated, remote attacker
can exploit this, via a crafted DTLS message, to exhaust
available memory resources. (CVE-2016-6308)

- A remote code execution vulnerability exists in the
read_state_machine() function in statem.c due to
improper handling of messages larger than 16k. An
unauthenticated, remote attacker can exploit this, via a
specially crafted message, to cause a use-after-free
error, resulting in a denial of service condition or
possibly the execution of arbitrary code.
(CVE-2016-6309)

- A cross-site scripting (XSS) vulnerability exists within
the JQuery UI dialog() function due to improper
validation of input to the 'closeText' parameter before
returning it to users. An unauthenticated, remote
attacker can exploit this, via a specially crafted
request, to execute arbitrary script code in a user's
browser session. (CVE-2016-7103)

- A denial of service vulnerability exists in x509_vfy.c
due to improper handling of certificate revocation lists
(CRLs). An unauthenticated, remote attacker can exploit
this, via a specially crafted CRL, to cause a NULL
pointer dereference, resulting in a crash of the
service. (CVE-2016-7052)

- An unspecified cross-site scripting (XSS) vulnerability
exists in the web interface due to improper validation
of input before returning it to users. An
unauthenticated, remote attacker can exploit this, via a
specially crafted request, to execute arbitrary script
code in a user's browser session. (VulnDB 148978)

See also :

http://www.tenable.com/security/tns-2016-20
http://www.tenable.com/products/passive-vulnerability-scanner
https://sweet32.info
https://www.openssl.org/blog/blog/2016/08/24/sweet32/

Solution :

Upgrade to Tenable Passive Vulnerability Scanner version 5.2.0 or
later.

Risk factor :

Critical / CVSS Base Score : 10.0
(CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C)
CVSS Temporal Score : 7.4
(CVSS2#E:U/RL:OF/RC:C)
Public Exploit Available : false