Blue Coat ProxySG 6.5.x < / 6.6.x < Multiple OpenSSL Vulnerabilities

Critical Nessus Plugin ID 93381

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: 6.7


The remote device is affected by multiple vulnerabilities.


The self-reported SGOS version installed on the remote Blue Coat ProxySG device is 6.5.x prior to or 6.6.x prior to It is, therefore, affected by multiple vulnerabilities in its bundled version of OpenSSL :

- Multiple flaws exist in the aesni_cbc_hmac_sha1_cipher() function in file crypto/evp/e_aes_cbc_hmac_sha1.c and the aesni_cbc_hmac_sha256_cipher() function in file crypto/evp/e_aes_cbc_hmac_sha256.c that are triggered when the connection uses an AES-CBC cipher and AES-NI is supported by the server. A man-in-the-middle attacker can exploit these to conduct a padding oracle attack, resulting in the ability to decrypt the network traffic.
Note that this issue does not affect the SG300 and SG600 hardware platforms. (CVE-2016-2107)

- A remote code execution vulnerability exists in the ASN.1 encoder due to an underflow condition that occurs when attempting to encode the value zero represented as a negative integer. An unauthenticated, remote attacker can exploit this to corrupt memory, resulting in the execution of arbitrary code. (CVE-2016-2108)

- Multiple unspecified flaws exist in the d2i BIO functions when reading ASN.1 data from a BIO due to invalid encoding causing a large allocation of memory.
An unauthenticated, remote attacker can exploit these to cause a denial of service condition through resource exhaustion. Note that this issue only affects management connections. (CVE-2016-2109)


Upgrade to Blue Coat SGOS version / or later.

See Also

Plugin Details

Severity: Critical

ID: 93381

File Name: bluecoat_proxy_sg_6_5_9_8.nasl

Version: 1.7

Type: local

Family: Firewalls

Published: 2016/09/08

Updated: 2018/06/29

Dependencies: 68992

Risk Information

Risk Factor: Critical

VPR Score: 6.7

CVSS v2.0

Base Score: 10

Temporal Score: 7.8

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

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

CVSS v3.0

Base Score: 9.8

Temporal Score: 8.8

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

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

Vulnerability Information

CPE: cpe:/o:bluecoat:sgos

Required KB Items: Host/BlueCoat/ProxySG/Version

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 2016/06/11

Vulnerability Publication Date: 2016/04/22

Reference Information

CVE: CVE-2016-2107, CVE-2016-2108, CVE-2016-2109

BID: 87940, 89752, 89760

EDB-ID: 39768