Vulnerabilities > CVE-2013-5959 - Improper Restriction of Operations Within the Bounds of A Memory Buffer vulnerability in Bluecoat Proxysg and Proxysgos

047910
CVSS 7.1 - HIGH
Attack vector
NETWORK
Attack complexity
MEDIUM
Privileges required
NONE
Confidentiality impact
NONE
Integrity impact
NONE
Availability impact
COMPLETE
network
bluecoat
CWE-119
nessus

Summary

Blue Coat ProxySG before 6.2.14.1, 6.3.x, 6.4.x, and 6.5 before 6.5.2 allows remote attackers to cause a denial of service (memory consumption and dropped connections) via a recursive href in an HTML page, which triggers a large number of HTTP RW pipeline pre-fetch requests.

Common Attack Pattern Enumeration and Classification (CAPEC)

  • Buffer Overflow via Environment Variables
    This attack pattern involves causing a buffer overflow through manipulation of environment variables. Once the attacker finds that they can modify an environment variable, they may try to overflow associated buffers. This attack leverages implicit trust often placed in environment variables.
  • Overflow Buffers
    Buffer Overflow attacks target improper or missing bounds checking on buffer operations, typically triggered by input injected by an attacker. As a consequence, an attacker is able to write past the boundaries of allocated buffer regions in memory, causing a program crash or potentially redirection of execution as per the attackers' choice.
  • Client-side Injection-induced Buffer Overflow
    This type of attack exploits a buffer overflow vulnerability in targeted client software through injection of malicious content from a custom-built hostile service.
  • Filter Failure through Buffer Overflow
    In this attack, the idea is to cause an active filter to fail by causing an oversized transaction. An attacker may try to feed overly long input strings to the program in an attempt to overwhelm the filter (by causing a buffer overflow) and hoping that the filter does not fail securely (i.e. the user input is let into the system unfiltered).
  • MIME Conversion
    An attacker exploits a weakness in the MIME conversion routine to cause a buffer overflow and gain control over the mail server machine. The MIME system is designed to allow various different information formats to be interpreted and sent via e-mail. Attack points exist when data are converted to MIME compatible format and back.

Nessus

NASL familyFirewalls
NASL idBLUECOAT_PROXY_SG_6_5_2.NASL
descriptionAccording to its self-reported version number, the Security Gateway OS (SGOS) version installed on the remote Blue Coat ProxySG device is potentially affected by a denial of service vulnerability caused by a large amount of HTTP RW pipeline pre-fetch requests. Note that only devices with forward or reverse mode for HTTP traffic enabled are affected.
last seen2020-06-01
modified2020-06-02
plugin id70302
published2013-10-04
reporterThis script is Copyright (C) 2013-2018 Tenable Network Security, Inc.
sourcehttps://www.tenable.com/plugins/nessus/70302
titleBlue Coat ProxySG Recursive HTTP Pipeline Pre-Fetch Remote DoS
code
#
# (C) Tenable Network Security, Inc.
#

include("compat.inc");

if (description)
{
  script_id(70302);
  script_version("1.3");
  script_cvs_date("Date: 2018/06/27 18:42:25");

  script_cve_id("CVE-2013-5959");
  script_bugtraq_id(62647);

  script_name(english:"Blue Coat ProxySG Recursive HTTP Pipeline Pre-Fetch Remote DoS");
  script_summary(english:"Checks the Blue Coat ProxySG SGOS version");

  script_set_attribute(attribute:"synopsis", value:
"The remote device is potentially affected by a denial of service
vulnerability.");
  script_set_attribute(attribute:"description", value:
"According to its self-reported version number, the Security Gateway OS
(SGOS) version installed on the remote Blue Coat ProxySG device is
potentially affected by a denial of service vulnerability caused by a
large amount of HTTP RW pipeline pre-fetch requests.

Note that only devices with forward or reverse mode for HTTP traffic
enabled are affected.");
  script_set_attribute(attribute:"see_also", value:"https://bto.bluecoat.com/security-advisory/sa75");
  script_set_attribute(attribute:"solution", value:
"Upgrade to SGOS version 5.4.12.9 / 5.5.11.5 / 6.2.14.1 / 6.3.6.2 /
6.4.5.1 / 6.5.2.0 or later. Alternatively, apply the workaround
referenced in the vendor advisory.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:N/I:N/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  
  script_set_attribute(attribute:"vuln_publication_date", value:"2013/09/09");
  script_set_attribute(attribute:"patch_publication_date", value:"2013/09/23");
  script_set_attribute(attribute:"plugin_publication_date", value:"2013/10/04");

  script_set_attribute(attribute:"potential_vulnerability", value:"true");
  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/h:bluecoat:proxysg");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:bluecoat:proxysgos");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:bluecoat:sgos");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2013-2018 Tenable Network Security, Inc.");
  script_family(english:"Firewalls");

  script_dependencies("bluecoat_proxy_sg_version.nasl");
  script_require_keys("Host/BlueCoat/ProxySG/Version", "Settings/ParanoidReport");

  exit(0);
}

include("audit.inc");
include("global_settings.inc");
include("misc_func.inc");

if (report_paranoia < 2) audit(AUDIT_PARANOID);

version    = get_kb_item_or_exit("Host/BlueCoat/ProxySG/Version");
ui_version = get_kb_item("Host/BlueCoat/ProxySG/UI_Version");

fix    = NULL;
vuln   = FALSE;

if      (version =~ "^5\.4([^0-9]|$)") fix = '5.4.12.9';
else if (version =~ "^5\.5([^0-9]|$)") fix = '5.5.11.5';
else if (version =~ "^6\.2([^0-9]|$)") fix = '6.2.14.1';
else if (version =~ "^6\.3([^0-9]|$)") fix = '6.3.6.2';
else if (version =~ "^6\.4([^0-9]|$)") fix = '6.4.5.1';
else if (version =~ "^6\.5([^0-9]|$)") fix = '6.5.2.0';

if (!isnull(fix) && ver_compare(ver:version, fix:fix, strict:FALSE) == -1) vuln = TRUE;

# 6.1. 5.3 and earlier have no fix
if (isnull(fix) && version =~ "^([0-4]\.[0-9]+|5\.[0-3]|6\.1)([^0-9]|$)")
{
  fix  = "Refer to the vendor.";
  vuln = TRUE;
}

if (!vuln) audit(AUDIT_INST_VER_NOT_VULN, 'Blue Coat ProxySG', version);

if (report_verbosity > 0)
{
  report_ver = NULL;
  report_fix = NULL;

  # Select format for output
  if (isnull(ui_version))
  {
    report_ver = version;
    report_fix = fix;
  }
  else
  {
    report_ver = ui_version;
    report_fix = fix + " Build 0";
  }

  report =
    '\n  Installed version : ' + report_ver +
    '\n  Fixed version     : ' + report_fix +
    '\n';
  security_hole(port:0, extra:report);
}
else security_hole(0);