Vulnerabilities > CVE-2016-7998 - Improper Input Validation vulnerability in Spip

047910
CVSS 8.8 - HIGH
Attack vector
NETWORK
Attack complexity
LOW
Privileges required
LOW
Confidentiality impact
HIGH
Integrity impact
HIGH
Availability impact
HIGH
network
low complexity
spip
CWE-20
nessus
exploit available
NVD
Published: 2017-01-18
Updated: 2017-05-24

Summary

The SPIP template composer/compiler in SPIP 3.1.2 and earlier allows remote authenticated users to execute arbitrary PHP code by uploading an HTML file with a crafted (1) INCLUDE or (2) INCLURE tag and then accessing it with a valider_xml action.

Vulnerable Configurations

Part Description Count
Application
Spip
100

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.
  • Server Side Include (SSI) Injection
    An attacker can use Server Side Include (SSI) Injection to send code to a web application that then gets executed by the web server. Doing so enables the attacker to achieve similar results to Cross Site Scripting, viz., arbitrary code execution and information disclosure, albeit on a more limited scale, since the SSI directives are nowhere near as powerful as a full-fledged scripting language. Nonetheless, the attacker can conveniently gain access to sensitive files, such as password files, and execute shell commands.
  • Cross Zone Scripting
    An attacker is able to cause a victim to load content into their web-browser that bypasses security zone controls and gain access to increased privileges to execute scripting code or other web objects such as unsigned ActiveX controls or applets. This is a privilege elevation attack targeted at zone-based web-browser security. In a zone-based model, pages belong to one of a set of zones corresponding to the level of privilege assigned to that page. Pages in an untrusted zone would have a lesser level of access to the system and/or be restricted in the types of executable content it was allowed to invoke. In a cross-zone scripting attack, a page that should be assigned to a less privileged zone is granted the privileges of a more trusted zone. This can be accomplished by exploiting bugs in the browser, exploiting incorrect configuration in the zone controls, through a cross-site scripting attack that causes the attackers' content to be treated as coming from a more trusted page, or by leveraging some piece of system functionality that is accessible from both the trusted and less trusted zone. This attack differs from "Restful Privilege Escalation" in that the latter correlates to the inadequate securing of RESTful access methods (such as HTTP DELETE) on the server, while cross-zone scripting attacks the concept of security zones as implemented by a browser.
  • Cross Site Scripting through Log Files
    An attacker may leverage a system weakness where logs are susceptible to log injection to insert scripts into the system's logs. If these logs are later viewed by an administrator through a thin administrative interface and the log data is not properly HTML encoded before being written to the page, the attackers' scripts stored in the log will be executed in the administrative interface with potentially serious consequences. This attack pattern is really a combination of two other attack patterns: log injection and stored cross site scripting.
  • Command Line Execution through SQL Injection
    An attacker uses standard SQL injection methods to inject data into the command line for execution. This could be done directly through misuse of directives such as MSSQL_xp_cmdshell or indirectly through injection of data into the database that would be interpreted as shell commands. Sometime later, an unscrupulous backend application (or could be part of the functionality of the same application) fetches the injected data stored in the database and uses this data as command line arguments without performing proper validation. The malicious data escapes that data plane by spawning new commands to be executed on the host.

Exploit-Db

descriptionSPIP 3.1.2 Template Compiler/Composer - PHP Code Execution. CVE-2016-7998. Webapps exploit for PHP platform
idEDB-ID:40595
last seen2016-10-20
modified2016-10-20
published2016-10-20
reporterSysdream
sourcehttps://www.exploit-db.com/download/40595/
titleSPIP 3.1.2 Template Compiler/Composer - PHP Code Execution

Nessus

NASL familyDebian Local Security Checks
NASL idDEBIAN_DLA-695.NASL
descriptionMultiple vulnerabilities have been discovered in SPIP, a website engine for publishing written in PHP. CVE-2016-7980 Nicolas Chatelain of Sysdream Labs discovered a cross-site request forgery (CSRF) vulnerability in the valider_xml action of SPIP. This allows remote attackers to make use of potential additional vulnerabilities such as the one described in CVE-2016-7998. CVE-2016-7981 Nicolas Chatelain of Sysdream Labs discovered a reflected cross-site scripting attack (XSS) vulnerability in the validater_xml action of SPIP. An attacker could take advantage of this vulnerability to inject arbitrary code by tricking an administrator to open a malicious link. CVE-2016-7982 Nicolas Chatelain of Sysdream Labs discovered a file enumeration / path traversal attack in the the validator_xml action of SPIP. An attacker could use this to enumerate files in an arbitrary directory on the file system. CVE-2016-7998 Nicolas Chatelain of Sysdream Labs discovered a possible PHP code execution vulnerability in the template compiler/composer function of SPIP. In combination with the XSS and CSRF vulnerabilities described in this advisory, a remote attacker could take advantage of this to execute arbitrary PHP code on the server. CVE-2016-7999 Nicolas Chatelain of Sysdream Labs discovered a server side request forgery in the valider_xml action of SPIP. Attackers could take advantage of this vulnerability to send HTTP or FTP requests to remote servers that they don
last seen2020-03-17
modified2016-11-03
plugin id94476
published2016-11-03
reporterThis script is Copyright (C) 2016-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
sourcehttps://www.tenable.com/plugins/nessus/94476
titleDebian DLA-695-1 : spip security update
code
#%NASL_MIN_LEVEL 80502
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory DLA-695-1. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include("compat.inc");

if (description)
{
  script_id(94476);
  script_version("2.6");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/03/12");

  script_cve_id("CVE-2016-7980", "CVE-2016-7981", "CVE-2016-7982", "CVE-2016-7998", "CVE-2016-7999");

  script_name(english:"Debian DLA-695-1 : spip security update");
  script_summary(english:"Checks dpkg output for the updated package.");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote Debian host is missing a security update."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"Multiple vulnerabilities have been discovered in SPIP, a website
engine for publishing written in PHP.

CVE-2016-7980

Nicolas Chatelain of Sysdream Labs discovered a cross-site request
forgery (CSRF) vulnerability in the valider_xml action of SPIP. This
allows remote attackers to make use of potential additional
vulnerabilities such as the one described in CVE-2016-7998.

CVE-2016-7981

Nicolas Chatelain of Sysdream Labs discovered a reflected cross-site
scripting attack (XSS) vulnerability in the validater_xml action of
SPIP. An attacker could take advantage of this vulnerability to inject
arbitrary code by tricking an administrator to open a malicious link.

CVE-2016-7982

Nicolas Chatelain of Sysdream Labs discovered a file enumeration /
path traversal attack in the the validator_xml action of SPIP. An
attacker could use this to enumerate files in an arbitrary directory
on the file system.

CVE-2016-7998

Nicolas Chatelain of Sysdream Labs discovered a possible PHP code
execution vulnerability in the template compiler/composer function of
SPIP. In combination with the XSS and CSRF vulnerabilities described
in this advisory, a remote attacker could take advantage of this to
execute arbitrary PHP code on the server.

CVE-2016-7999

Nicolas Chatelain of Sysdream Labs discovered a server side request
forgery in the valider_xml action of SPIP. Attackers could take
advantage of this vulnerability to send HTTP or FTP requests to remote
servers that they don't have direct access to, possibly bypassing
access controls such as a firewall.

For Debian 7 'Wheezy', these problems have been fixed in version
2.1.17-1+deb7u6.

We recommend that you upgrade your spip packages.

NOTE: Tenable Network Security has extracted the preceding description
block directly from the DLA security advisory. Tenable has attempted
to automatically clean and format it as much as possible without
introducing additional issues."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://lists.debian.org/debian-lts-announce/2016/11/msg00003.html"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://packages.debian.org/source/wheezy/spip"
  );
  script_set_attribute(attribute:"solution", value:"Upgrade the affected spip package.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:POC/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:P/RL:O/RC:C");
  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:spip");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:7.0");

  script_set_attribute(attribute:"patch_publication_date", value:"2016/11/02");
  script_set_attribute(attribute:"plugin_publication_date", value:"2016/11/03");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2016-2020 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"Debian Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/Debian/release", "Host/Debian/dpkg-l");

  exit(0);
}


include("audit.inc");
include("debian_package.inc");


if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/Debian/release")) audit(AUDIT_OS_NOT, "Debian");
if (!get_kb_item("Host/Debian/dpkg-l")) audit(AUDIT_PACKAGE_LIST_MISSING);


flag = 0;
if (deb_check(release:"7.0", prefix:"spip", reference:"2.1.17-1+deb7u6")) flag++;

if (flag)
{
  if (report_verbosity > 0) security_warning(port:0, extra:deb_report_get());
  else security_warning(0);
  exit(0);
}
else audit(AUDIT_HOST_NOT, "affected");

Packetstorm

References