Vulnerabilities > CVE-2016-3367 - Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability in Microsoft Silverlight 5.0

047910
CVSS 8.8 - HIGH
Attack vector
NETWORK
Attack complexity
LOW
Privileges required
NONE
Confidentiality impact
HIGH
Integrity impact
HIGH
Availability impact
HIGH
network
low complexity
microsoft
CWE-119
nessus
NVD
Published: 2016-09-14
Updated: 2018-10-12

Summary

StringBuilder in Microsoft Silverlight 5 before 5.1.50709.0 does not properly allocate memory for string-insert and string-append operations, which allows remote attackers to execute arbitrary code via a crafted web site, aka "Microsoft Silverlight Memory Corruption Vulnerability."

Vulnerable Configurations

Part Description Count
Application
Microsoft
1

Common Weakness Enumeration (CWE)

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 familyMacOS X Local Security Checks
    NASL idMACOSX_MS16-109.NASL
    descriptionThe version of Microsoft Silverlight installed on the remote Mac OS X host is affected by a remote code execution vulnerability due to improper handling of objects in memory. An unauthenticated, remote attacker can exploit this, by convincing a user to visit a website containing a specially crafted Silverlight application, to execute arbitrary code in the context of the current user.
    last seen2020-06-01
    modified2020-06-02
    plugin id93463
    published2016-09-13
    reporterThis script is Copyright (C) 2016-2018 Tenable Network Security, Inc.
    sourcehttps://www.tenable.com/plugins/nessus/93463
    titleMS16-109: Security Update for Silverlight (3182373) (Mac OS X)
    code
    #
# (C) Tenable Network Security, Inc.
#

include("compat.inc");

if (description)
{
  script_id(93463);
  script_version("1.6");
  script_cvs_date("Date: 2018/07/14  1:59:36");

  script_cve_id("CVE-2016-3367");
  script_bugtraq_id(92837);
  script_xref(name:"MSFT", value:"MS16-109");
  script_xref(name:"IAVA", value:"2016-A-0246");
  script_xref(name:"MSKB", value:"3182373");

  script_name(english:"MS16-109: Security Update for Silverlight (3182373) (Mac OS X)");
  script_summary(english:"Checks the version of Microsoft Silverlight.");

  script_set_attribute(attribute:"synopsis", value:
"A multimedia application framework installed on the remote Mac OS X
host is affected by a remote code execution vulnerability.");
  script_set_attribute(attribute:"description", value:
"The version of Microsoft Silverlight installed on the remote Mac OS X
host is affected by a remote code execution vulnerability due to
improper handling of objects in memory. An unauthenticated, remote
attacker can exploit this, by convincing a user to visit a website
containing a specially crafted Silverlight application, to execute
arbitrary code in the context of the current user.");
  script_set_attribute(attribute:"see_also", value:"https://technet.microsoft.com/library/security/MS16-109");
  script_set_attribute(attribute:"solution", value:
"Microsoft has released a set of patches for Silverlight 5.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/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:"2016/09/13");
  script_set_attribute(attribute:"patch_publication_date", value:"2016/09/13");
  script_set_attribute(attribute:"plugin_publication_date", value:"2016/09/13");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:silverlight");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"MacOS X Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2016-2018 Tenable Network Security, Inc.");

  script_dependencies("macosx_silverlight_installed.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/MacOSX/Version", "MacOSX/Silverlight/Installed");

  exit(0);
}

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

kb_base = "MacOSX/Silverlight";
get_kb_item_or_exit(kb_base+"/Installed");
path = get_kb_item_or_exit(kb_base+"/Path", exit_code:1);
version = get_kb_item_or_exit(kb_base+"/Version", exit_code:1);


bulletin = "MS16-109";
kb = "3182373";

fixed_version = "5.1.50709.0";
if (version =~ "^5\." && ver_compare(ver:version, fix:fixed_version, strict:FALSE) < 0)
{
  if (defined_func("report_xml_tag")) report_xml_tag(tag:bulletin, value:kb);

  report =
    '\n  Path              : ' + path +
    '\n  Installed version : ' + version +
    '\n  Fixed version     : ' + fixed_version +
    '\n';
  security_report_v4(port:0, severity:SECURITY_HOLE, extra:report);
}
else audit(AUDIT_INST_VER_NOT_VULN, "Microsoft Silverlight", version);
  • NASL familyWindows : Microsoft Bulletins
    NASL idSMB_NT_MS16-109.NASL
    descriptionThe version of Microsoft Silverlight installed on the remote Windows host is affected by a remote code execution vulnerability due to improper handling of objects in memory. An unauthenticated, remote attacker can exploit this, by convincing a user to visit a website containing a specially crafted Silverlight application, to execute arbitrary code in the context of the current user.
    last seen2020-06-01
    modified2020-06-02
    plugin id93468
    published2016-09-13
    reporterThis script is Copyright (C) 2016-2018 Tenable Network Security, Inc.
    sourcehttps://www.tenable.com/plugins/nessus/93468
    titleMS16-109: Security Update for Silverlight (3182373)
    code
    #
# (C) Tenable Network Security, Inc.
#

include("compat.inc");

if (description)
{
  script_id(93468);
  script_version("1.6");
  script_cvs_date("Date: 2018/07/30 15:31:34");

  script_cve_id("CVE-2016-3367");
  script_bugtraq_id(92837);
  script_xref(name:"MSFT", value:"MS16-109");
  script_xref(name:"MSKB", value:"3182373");
  script_xref(name:"IAVA", value:"2016-A-0246");

  script_name(english:"MS16-109: Security Update for Silverlight (3182373)");
  script_summary(english:"Checks the version of Microsoft Silverlight.");

  script_set_attribute(attribute:"synopsis", value:
"A multimedia application framework installed on the remote Windows
host is affected by a remote code execution vulnerability.");
  script_set_attribute(attribute:"description", value:
"The version of Microsoft Silverlight installed on the remote Windows
host is affected by a remote code execution vulnerability due to
improper handling of objects in memory. An unauthenticated, remote
attacker can exploit this, by convincing a user to visit a website
containing a specially crafted Silverlight application, to execute
arbitrary code in the context of the current user.");
  script_set_attribute(attribute:"see_also", value:"https://technet.microsoft.com/library/security/MS16-109");
  script_set_attribute(attribute:"solution", value:
"Microsoft has released a set of patches for Silverlight 5.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/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:"2016/09/13");
  script_set_attribute(attribute:"patch_publication_date", value:"2016/09/13");
  script_set_attribute(attribute:"plugin_publication_date", value:"2016/09/13");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:silverlight");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Windows : Microsoft Bulletins");

  script_copyright(english:"This script is Copyright (C) 2016-2018 Tenable Network Security, Inc.");

  script_dependencies("smb_hotfixes.nasl", "silverlight_detect.nasl", "ms_bulletin_checks_possible.nasl");
  script_require_keys("SMB/MS_Bulletin_Checks/Possible");
  script_require_ports(139, 445, "Host/patch_management_checks");

  exit(0);
}

include("audit.inc");
include("smb_hotfixes_fcheck.inc");
include("smb_hotfixes.inc");
include("smb_func.inc");
include("misc_func.inc");

get_kb_item_or_exit("SMB/MS_Bulletin_Checks/Possible");

bulletin = 'MS16-109';
kb = "3182373";

kbs = make_list(kb);
if (get_kb_item("Host/patch_management_checks")) hotfix_check_3rd_party(bulletin:bulletin, kbs:kbs, severity:SECURITY_HOLE);

get_kb_item_or_exit("SMB/Registry/Enumerated");

# Silverlight 5.x
ver = get_kb_item("SMB/Silverlight/Version");
if (isnull(ver)) audit(AUDIT_NOT_INST, "Silverlight");
if (ver !~ "^5\.") audit(AUDIT_NOT_INST, "Silverlight 5");

fix = "5.1.50709.0";
if (ver_compare(ver:ver, fix:fix) == -1)
{
  path = get_kb_item("SMB/Silverlight/Path");
  if (isnull(path)) path = 'n/a';

  report +=
    '\n  Path              : ' + path +
    '\n  Installed version : ' + ver +
    '\n  Fixed version     : ' + fix +
    '\n';
  hotfix_add_report(report, bulletin:bulletin, kb:kb);

  set_kb_item(name:"SMB/Missing/"+bulletin, value:TRUE);
  hotfix_security_hole();
  hotfix_check_fversion_end();
}
else
{
  hotfix_check_fversion_end();
  audit(AUDIT_HOST_NOT, 'affected');
}

References