Vulnerabilities > CVE-2015-0850 - Improper Input Validation vulnerability in Fusionforge 6.0

047910
CVSS 10.0 - CRITICAL
Attack vector
NETWORK
Attack complexity
LOW
Privileges required
NONE
Confidentiality impact
COMPLETE
Integrity impact
COMPLETE
Availability impact
COMPLETE
network
low complexity
fusionforge
CWE-20
critical
nessus
NVD
Published: 2015-06-02
Updated: 2015-06-03

Summary

The Git plugin for FusionForge before 6.0rc4 allows remote attackers to execute arbitrary code via an unspecified parameter when creating a secondary Git repository.

Vulnerable Configurations

Part Description Count
Application
Fusionforge
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.
  • 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.

Nessus

  • NASL familyDebian Local Security Checks
    NASL idDEBIAN_DSA-3275.NASL
    descriptionAnsgar Burchardt discovered that the Git plugin for FusionForge, a web-based project-management and collaboration software, does not sufficiently validate user provided input as parameter to the method to create secondary Git repositories. A remote attacker can use this flaw to execute arbitrary code as root via a specially crafted URL.
    last seen2020-06-01
    modified2020-06-02
    plugin id83908
    published2015-06-01
    reporterThis script is Copyright (C) 2015-2018 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/83908
    titleDebian DSA-3275-1 : fusionforge - security update
    code
    #
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Debian Security Advisory DSA-3275. The text 
# itself is copyright (C) Software in the Public Interest, Inc.
#

include("compat.inc");

if (description)
{
  script_id(83908);
  script_version("2.3");
  script_cvs_date("Date: 2018/11/10 11:49:37");

  script_cve_id("CVE-2015-0850");
  script_xref(name:"DSA", value:"3275");

  script_name(english:"Debian DSA-3275-1 : fusionforge - 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-related update."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"Ansgar Burchardt discovered that the Git plugin for FusionForge, a
web-based project-management and collaboration software, does not
sufficiently validate user provided input as parameter to the method
to create secondary Git repositories. A remote attacker can use this
flaw to execute arbitrary code as root via a specially crafted URL."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://packages.debian.org/source/jessie/fusionforge"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.debian.org/security/2015/dsa-3275"
  );
  script_set_attribute(
    attribute:"solution", 
    value:
"Upgrade the fusionforge packages.

For the stable distribution (jessie), this problem has been fixed in
version 5.3.2+20141104-3+deb8u1."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:fusionforge");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:8.0");

  script_set_attribute(attribute:"patch_publication_date", value:"2015/05/30");
  script_set_attribute(attribute:"plugin_publication_date", value:"2015/06/01");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2015-2018 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:"8.0", prefix:"fusionforge-full", reference:"5.3.2+20141104-3+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"fusionforge-minimal", reference:"5.3.2+20141104-3+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"fusionforge-plugin-admssw", reference:"5.3.2+20141104-3+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"fusionforge-plugin-authcas", reference:"5.3.2+20141104-3+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"fusionforge-plugin-authhttpd", reference:"5.3.2+20141104-3+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"fusionforge-plugin-authldap", reference:"5.3.2+20141104-3+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"fusionforge-plugin-blocks", reference:"5.3.2+20141104-3+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"fusionforge-plugin-compactpreview", reference:"5.3.2+20141104-3+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"fusionforge-plugin-contribtracker", reference:"5.3.2+20141104-3+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"fusionforge-plugin-doaprdf", reference:"5.3.2+20141104-3+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"fusionforge-plugin-extsubproj", reference:"5.3.2+20141104-3+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"fusionforge-plugin-foafprofiles", reference:"5.3.2+20141104-3+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"fusionforge-plugin-globalsearch", reference:"5.3.2+20141104-3+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"fusionforge-plugin-gravatar", reference:"5.3.2+20141104-3+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"fusionforge-plugin-headermenu", reference:"5.3.2+20141104-3+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"fusionforge-plugin-hudson", reference:"5.3.2+20141104-3+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"fusionforge-plugin-mediawiki", reference:"5.3.2+20141104-3+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"fusionforge-plugin-message", reference:"5.3.2+20141104-3+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"fusionforge-plugin-moinmoin", reference:"5.3.2+20141104-3+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"fusionforge-plugin-projectlabels", reference:"5.3.2+20141104-3+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"fusionforge-plugin-scmarch", reference:"5.3.2+20141104-3+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"fusionforge-plugin-scmbzr", reference:"5.3.2+20141104-3+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"fusionforge-plugin-scmcvs", reference:"5.3.2+20141104-3+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"fusionforge-plugin-scmdarcs", reference:"5.3.2+20141104-3+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"fusionforge-plugin-scmgit", reference:"5.3.2+20141104-3+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"fusionforge-plugin-scmhg", reference:"5.3.2+20141104-3+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"fusionforge-plugin-scmhook", reference:"5.3.2+20141104-3+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"fusionforge-plugin-scmsvn", reference:"5.3.2+20141104-3+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"fusionforge-plugin-sysauthldap", reference:"5.3.2+20141104-3+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"fusionforge-standard", reference:"5.3.2+20141104-3+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"gforge", reference:"5.3.2+20141104-3+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"gforge-common", reference:"5.3.2+20141104-3+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"gforge-db-postgresql", reference:"5.3.2+20141104-3+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"gforge-db-remote", reference:"5.3.2+20141104-3+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"gforge-dns-bind9", reference:"5.3.2+20141104-3+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"gforge-ftp-proftpd", reference:"5.3.2+20141104-3+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"gforge-lists-mailman", reference:"5.3.2+20141104-3+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"gforge-mta-exim4", reference:"5.3.2+20141104-3+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"gforge-mta-postfix", reference:"5.3.2+20141104-3+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"gforge-shell-postgresql", reference:"5.3.2+20141104-3+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"gforge-web-apache2", reference:"5.3.2+20141104-3+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"gforge-web-apache2-vhosts", reference:"5.3.2+20141104-3+deb8u1")) flag++;

if (flag)
{
  if (report_verbosity > 0) security_hole(port:0, extra:deb_report_get());
  else security_hole(0);
  exit(0);
}
else audit(AUDIT_HOST_NOT, "affected");
  • NASL familyFedora Local Security Checks
    NASL idFEDORA_2015-9128.NASL
    descriptionSecurity fix for CVE-2015-0850 CVE-2015-0850: Prevent arbitrary command execution via clone URL parameter of the method to create secondary Git repositories. Found by Ansgar Burchardt <ansgar at debian.org>. Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen2020-06-05
    modified2015-06-11
    plugin id84099
    published2015-06-11
    reporterThis script is Copyright (C) 2015-2020 Tenable Network Security, Inc.
    sourcehttps://www.tenable.com/plugins/nessus/84099
    titleFedora 21 : fusionforge-5.3.2-4.fc21 (2015-9128)
    code
    #%NASL_MIN_LEVEL 80502
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Fedora Security Advisory 2015-9128.
#

include("compat.inc");

if (description)
{
  script_id(84099);
  script_version("2.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/06/04");

  script_cve_id("CVE-2015-0850");
  script_xref(name:"FEDORA", value:"2015-9128");

  script_name(english:"Fedora 21 : fusionforge-5.3.2-4.fc21 (2015-9128)");
  script_summary(english:"Checks rpm output for the updated package.");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote Fedora host is missing a security update."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"Security fix for CVE-2015-0850 CVE-2015-0850: Prevent arbitrary
command execution via clone URL parameter of the method to create
secondary Git repositories. Found by Ansgar Burchardt <ansgar at
debian.org>.

Note that Tenable Network Security has extracted the preceding
description block directly from the Fedora 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://bugzilla.redhat.com/show_bug.cgi?id=1226872"
  );
  # https://lists.fedoraproject.org/pipermail/package-announce/2015-June/159940.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?fb986a36"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Update the affected fusionforge package."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fedoraproject:fedora:fusionforge");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:fedoraproject:fedora:21");

  script_set_attribute(attribute:"patch_publication_date", value:"2015/05/30");
  script_set_attribute(attribute:"plugin_publication_date", value:"2015/06/11");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2015-2020 Tenable Network Security, Inc.");
  script_family(english:"Fedora Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/RedHat/release", "Host/RedHat/rpm-list");

  exit(0);
}


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

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item("Host/RedHat/release");
if (isnull(release) || "Fedora" >!< release) audit(AUDIT_OS_NOT, "Fedora");
os_ver = eregmatch(pattern: "Fedora.*release ([0-9]+)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Fedora");
os_ver = os_ver[1];
if (! ereg(pattern:"^21([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Fedora 21.x", "Fedora " + os_ver);

if (!get_kb_item("Host/RedHat/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);

cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Fedora", cpu);

flag = 0;
if (rpm_check(release:"FC21", reference:"fusionforge-5.3.2-4.fc21")) flag++;


if (flag)
{
  if (report_verbosity > 0) security_hole(port:0, extra:rpm_report_get());
  else security_hole(0);
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "fusionforge");
}
  • NASL familyFedora Local Security Checks
    NASL idFEDORA_2015-9324.NASL
    descriptionSecurity fix for CVE-2015-0850 CVE-2015-0850: Prevent arbitrary command execution via clone URL parameter of the method to create secondary Git repositories. Found by Ansgar Burchardt <ansgar at debian.org>. Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen2020-06-05
    modified2015-06-11
    plugin id84101
    published2015-06-11
    reporterThis script is Copyright (C) 2015-2020 Tenable Network Security, Inc.
    sourcehttps://www.tenable.com/plugins/nessus/84101
    titleFedora 22 : fusionforge-5.3.2-4.fc22 (2015-9324)
    code
    #%NASL_MIN_LEVEL 80502
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Fedora Security Advisory 2015-9324.
#

include("compat.inc");

if (description)
{
  script_id(84101);
  script_version("2.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/06/04");

  script_cve_id("CVE-2015-0850");
  script_xref(name:"FEDORA", value:"2015-9324");

  script_name(english:"Fedora 22 : fusionforge-5.3.2-4.fc22 (2015-9324)");
  script_summary(english:"Checks rpm output for the updated package.");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote Fedora host is missing a security update."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"Security fix for CVE-2015-0850 CVE-2015-0850: Prevent arbitrary
command execution via clone URL parameter of the method to create
secondary Git repositories. Found by Ansgar Burchardt <ansgar at
debian.org>.

Note that Tenable Network Security has extracted the preceding
description block directly from the Fedora 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://bugzilla.redhat.com/show_bug.cgi?id=1226872"
  );
  # https://lists.fedoraproject.org/pipermail/package-announce/2015-June/160021.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?016304d7"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Update the affected fusionforge package."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fedoraproject:fedora:fusionforge");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:fedoraproject:fedora:22");

  script_set_attribute(attribute:"patch_publication_date", value:"2015/06/02");
  script_set_attribute(attribute:"plugin_publication_date", value:"2015/06/11");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2015-2020 Tenable Network Security, Inc.");
  script_family(english:"Fedora Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/RedHat/release", "Host/RedHat/rpm-list");

  exit(0);
}


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

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item("Host/RedHat/release");
if (isnull(release) || "Fedora" >!< release) audit(AUDIT_OS_NOT, "Fedora");
os_ver = eregmatch(pattern: "Fedora.*release ([0-9]+)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Fedora");
os_ver = os_ver[1];
if (! ereg(pattern:"^22([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Fedora 22.x", "Fedora " + os_ver);

if (!get_kb_item("Host/RedHat/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);

cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Fedora", cpu);

flag = 0;
if (rpm_check(release:"FC22", reference:"fusionforge-5.3.2-4.fc22")) flag++;


if (flag)
{
  if (report_verbosity > 0) security_hole(port:0, extra:rpm_report_get());
  else security_hole(0);
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "fusionforge");
}

References