Vulnerabilities > CVE-2018-7490 - Path Traversal vulnerability in multiple products

047910
CVSS 7.5 - HIGH
Attack vector
NETWORK
Attack complexity
LOW
Privileges required
NONE
Confidentiality impact
HIGH
Integrity impact
NONE
Availability impact
NONE
network
low complexity
unbit
debian
CWE-22
nessus
exploit available
NVD
Published: 2018-02-26
Updated: 2018-03-23

Summary

uWSGI before 2.0.17 mishandles a DOCUMENT_ROOT check during use of the --php-docroot option, allowing directory traversal.

Vulnerable Configurations

Part Description Count
Application
Unbit
116
OS
Debian
2

Common Weakness Enumeration (CWE)

Common Attack Pattern Enumeration and Classification (CAPEC)

  • Relative Path Traversal
    An attacker exploits a weakness in input validation on the target by supplying a specially constructed path utilizing dot and slash characters for the purpose of obtaining access to arbitrary files or resources. An attacker modifies a known path on the target in order to reach material that is not available through intended channels. These attacks normally involve adding additional path separators (/ or \) and/or dots (.), or encodings thereof, in various combinations in order to reach parent directories or entirely separate trees of the target's directory structure.
  • Directory Traversal
    An attacker with access to file system resources, either directly or via application logic, will use various file path specification or navigation mechanisms such as ".." in path strings and absolute paths to extend their range of access to inappropriate areas of the file system. The attacker attempts to either explore the file system for recon purposes or access directories and files that are intended to be restricted from their access. Exploring the file system can be achieved through constructing paths presented to directory listing programs, such as "ls" and 'dir', or through specially crafted programs that attempt to explore the file system. The attacker engaging in this type of activity is searching for information that can be used later in a more exploitive attack. Access to restricted directories or files can be achieved through modification of path references utilized by system applications.
  • File System Function Injection, Content Based
    An attack of this type exploits the host's trust in executing remote content including binary files. The files are poisoned with a malicious payload (targeting the file systems accessible by the target software) by the attacker and may be passed through standard channels such as via email, and standard web content like PDF and multimedia files. The attacker exploits known vulnerabilities or handling routines in the target processes. Vulnerabilities of this type have been found in a wide variety of commercial applications from Microsoft Office to Adobe Acrobat and Apple Safari web browser. When the attacker knows the standard handling routines and can identify vulnerabilities and entry points they can be exploited by otherwise seemingly normal content. Once the attack is executed, the attackers' program can access relative directories such as C:\Program Files or other standard system directories to launch further attacks. In a worst case scenario, these programs are combined with other propagation logic and work as a virus.
  • Using Slashes and URL Encoding Combined to Bypass Validation Logic
    This attack targets the encoding of the URL combined with the encoding of the slash characters. An attacker can take advantage of the multiple way of encoding an URL and abuse the interpretation of the URL. An URL may contain special character that need special syntax handling in order to be interpreted. Special characters are represented using a percentage character followed by two digits representing the octet code of the original character (%HEX-CODE). For instance US-ASCII space character would be represented with %20. This is often referred as escaped ending or percent-encoding. Since the server decodes the URL from the requests, it may restrict the access to some URL paths by validating and filtering out the URL requests it received. An attacker will try to craft an URL with a sequence of special characters which once interpreted by the server will be equivalent to a forbidden URL. It can be difficult to protect against this attack since the URL can contain other format of encoding such as UTF-8 encoding, Unicode-encoding, etc.
  • Manipulating Input to File System Calls
    An attacker manipulates inputs to the target software which the target software passes to file system calls in the OS. The goal is to gain access to, and perhaps modify, areas of the file system that the target software did not intend to be accessible.

D2sec

nameuWSGI Path Traversal File Disclosure
urlhttp://www.d2sec.com/exploits/uwsgi_path_traversal_file_disclosure.html

Exploit-Db

descriptionuWSGI < 2.0.17 - Directory Traversal. CVE-2018-7490. Webapps exploit for PHP platform
fileexploits/php/webapps/44223.txt
idEDB-ID:44223
last seen2018-05-24
modified2018-03-02
platformphp
port
published2018-03-02
reporterExploit-DB
sourcehttps://www.exploit-db.com/download/44223/
titleuWSGI < 2.0.17 - Directory Traversal
typewebapps

Nessus

  • NASL familyFedora Local Security Checks
    NASL idFEDORA_2018-ACFCE682F4.NASL
    description - Fix building in Rawhide (#1556525) (Jakub Jelen) - Disable tcp_wrappers for Fedora 28 and newer (Jakub Jelen) --- - Modernize and generalize building of Python subpackages : - replace python with python2 - use appropriate macros for when refering to Python 3 - prefix Python-dependent plugins with the version of Python they are built with - Also build Python 3 subpackages for the other Python 3 version in EPEL7 --- - Build Python 3 version(s) of gevent plugin on Fedora and EPEL7 - Build Python 3 version of greenlet plugin on Fedora and EPEL7 - Build Python 2 version of greenlet plugin on EPEL7 - Always build Python 3 version of tornado plugin when building with Python 3 (drop python3_tornado build conditional) --- - Latest upstream (rhbz#1549354) - Enable uwsgi-plugin-coroae on EL7 - Use systemd tmpfiles to create /run/uwsgi with group write permissions (rhbz#1427303) - Use /var/run/uwsgi when not using systemd - Build with versioned python command - Remove %%config from systemd unit file - Disable greenlet plugin on EL7 Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen2020-06-05
    modified2019-01-03
    plugin id120701
    published2019-01-03
    reporterThis script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/120701
    titleFedora 28 : uwsgi (2018-acfce682f4)
    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 FEDORA-2018-acfce682f4.
#

include("compat.inc");

if (description)
{
  script_id(120701);
  script_version("1.7");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/06/04");

  script_cve_id("CVE-2018-7490");
  script_xref(name:"FEDORA", value:"2018-acfce682f4");

  script_name(english:"Fedora 28 : uwsgi (2018-acfce682f4)");
  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:
"  - Fix building in Rawhide (#1556525) (Jakub Jelen)

  - Disable tcp_wrappers for Fedora 28 and newer (Jakub
    Jelen)

---

  - Modernize and generalize building of Python 
subpackages :

  - replace python with python2

  - use appropriate macros for when refering to Python 3

  - prefix Python-dependent plugins with the version of
    Python they are built with

  - Also build Python 3 subpackages for the other Python 3
    version in EPEL7

---

  - Build Python 3 version(s) of gevent plugin on Fedora and
    EPEL7

  - Build Python 3 version of greenlet plugin on Fedora and
    EPEL7

  - Build Python 2 version of greenlet plugin on EPEL7

  - Always build Python 3 version of tornado plugin when
    building with Python 3 (drop python3_tornado build
    conditional)

---

  - Latest upstream (rhbz#1549354)

  - Enable uwsgi-plugin-coroae on EL7

  - Use systemd tmpfiles to create /run/uwsgi with group
    write permissions (rhbz#1427303)

  - Use /var/run/uwsgi when not using systemd

  - Build with versioned python command

  - Remove %%config from systemd unit file

  - Disable greenlet plugin on EL7

Note that Tenable Network Security has extracted the preceding
description block directly from the Fedora update system website.
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://bodhi.fedoraproject.org/updates/FEDORA-2018-acfce682f4"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected uwsgi package.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:F/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:F/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:"d2_elliot_name", value:"uWSGI Path Traversal File Disclosure");
  script_set_attribute(attribute:"exploit_framework_d2_elliot", value:"true");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fedoraproject:fedora:uwsgi");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:fedoraproject:fedora:28");

  script_set_attribute(attribute:"vuln_publication_date", value:"2018/02/26");
  script_set_attribute(attribute:"patch_publication_date", value:"2018/07/20");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/01/03");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof.");
  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 = pregmatch(pattern: "Fedora.*release ([0-9]+)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Fedora");
os_ver = os_ver[1];
if (! preg(pattern:"^28([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Fedora 28", "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:"FC28", reference:"uwsgi-2.0.17.1-1.fc28")) flag++;


if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    extra      : rpm_report_get()
  );
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "uwsgi");
}
  • NASL familyFedora Local Security Checks
    NASL idFEDORA_2018-04B3AF1EDF.NASL
    description - Conditionally disable router-access for tcp_wrappers deprecation (Jorge Gallegos) - Updated to 2.0.16 which includes fix for CVE-2018-6758 (Jorge Gallegos) --- - Modernize and generalize building of Python subpackages : - replace python with python2 - use appropriate macros for when refering to Python 3 - prefix Python-dependent plugins with the version of Python they are built with - Also build Python 3 subpackages for the other Python 3 version in EPEL7 --- - Build Python 3 version(s) of gevent plugin on Fedora and EPEL7 - Build Python 3 version of greenlet plugin on Fedora and EPEL7 - Build Python 2 version of greenlet plugin on EPEL7 - Always build Python 3 version of tornado plugin when building with Python 3 (drop python3_tornado build conditional) --- - Latest upstream (rhbz#1549354) - Enable uwsgi-plugin-coroae on EL7 - Use systemd tmpfiles to create /run/uwsgi with group write permissions (rhbz#1427303) - Use /var/run/uwsgi when not using systemd - Build with versioned python command - Remove %%config from systemd unit file - Disable greenlet plugin on EL7 Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen2020-06-05
    modified2018-07-24
    plugin id111235
    published2018-07-24
    reporterThis script is Copyright (C) 2018-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/111235
    titleFedora 27 : uwsgi (2018-04b3af1edf)
    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 FEDORA-2018-04b3af1edf.
#

include("compat.inc");

if (description)
{
  script_id(111235);
  script_version("1.9");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/06/04");

  script_cve_id("CVE-2018-6758", "CVE-2018-7490");
  script_xref(name:"FEDORA", value:"2018-04b3af1edf");

  script_name(english:"Fedora 27 : uwsgi (2018-04b3af1edf)");
  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:
"  - Conditionally disable router-access for tcp_wrappers
    deprecation (Jorge Gallegos)

  - Updated to 2.0.16 which includes fix for CVE-2018-6758
    (Jorge Gallegos)

---

  - Modernize and generalize building of Python 
subpackages :

  - replace python with python2

  - use appropriate macros for when refering to Python 3

  - prefix Python-dependent plugins with the version of
    Python they are built with

  - Also build Python 3 subpackages for the other Python 3
    version in EPEL7

---

  - Build Python 3 version(s) of gevent plugin on Fedora and
    EPEL7

  - Build Python 3 version of greenlet plugin on Fedora and
    EPEL7

  - Build Python 2 version of greenlet plugin on EPEL7

  - Always build Python 3 version of tornado plugin when
    building with Python 3 (drop python3_tornado build
    conditional)

---

  - Latest upstream (rhbz#1549354)

  - Enable uwsgi-plugin-coroae on EL7

  - Use systemd tmpfiles to create /run/uwsgi with group
    write permissions (rhbz#1427303)

  - Use /var/run/uwsgi when not using systemd

  - Build with versioned python command

  - Remove %%config from systemd unit file

  - Disable greenlet plugin on EL7

Note that Tenable Network Security has extracted the preceding
description block directly from the Fedora update system website.
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://bodhi.fedoraproject.org/updates/FEDORA-2018-04b3af1edf"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected uwsgi package.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:F/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:F/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:"d2_elliot_name", value:"uWSGI Path Traversal File Disclosure");
  script_set_attribute(attribute:"exploit_framework_d2_elliot", value:"true");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fedoraproject:fedora:uwsgi");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:fedoraproject:fedora:27");

  script_set_attribute(attribute:"vuln_publication_date", value:"2018/02/06");
  script_set_attribute(attribute:"patch_publication_date", value:"2018/07/20");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/07/24");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2018-2020 and is owned by Tenable, Inc. or an Affiliate thereof.");
  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 = pregmatch(pattern: "Fedora.*release ([0-9]+)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Fedora");
os_ver = os_ver[1];
if (! preg(pattern:"^27([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Fedora 27", "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:"FC27", reference:"uwsgi-2.0.17.1-1.fc27")) flag++;


if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : rpm_report_get()
  );
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "uwsgi");
}
  • NASL familyDebian Local Security Checks
    NASL idDEBIAN_DSA-4142.NASL
    descriptionMarios Nicolaides discovered that the PHP plugin in uWSGI, a fast, self-healing application container server, does not properly handle a DOCUMENT_ROOT check during use of the --php-docroot option, allowing a remote attacker to mount a directory traversal attack and gain unauthorized read access to sensitive files located outside of the web root directory.
    last seen2020-06-01
    modified2020-06-02
    plugin id108419
    published2018-03-19
    reporterThis script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/108419
    titleDebian DSA-4142-1 : uwsgi - security update

Packetstorm

data sourcehttps://packetstormsecurity.com/files/download/146632/uwsgi-traversal.txt
idPACKETSTORM:146632
last seen2018-03-06
published2018-03-02
reporterMarios Nicolaides
sourcehttps://packetstormsecurity.com/files/146632/uWSGI-Directory-Traversal.html
titleuWSGI Directory Traversal

References