Vulnerabilities > CVE-2018-6758 - Out-of-bounds Write vulnerability in Unbit Uwsgi

047910
CVSS 7.5 - HIGH
Attack vector
NETWORK
Attack complexity
LOW
Privileges required
NONE
Confidentiality impact
PARTIAL
Integrity impact
PARTIAL
Availability impact
PARTIAL
network
low complexity
unbit
CWE-787
nessus

Summary

The uwsgi_expand_path function in core/utils.c in Unbit uWSGI through 2.0.15 has a stack-based buffer overflow via a large directory length.

Common Weakness Enumeration (CWE)

Nessus

  • 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 familyFreeBSD Local Security Checks
    NASL idFREEBSD_PKG_A8F25565109E11E88D4197657151F8C2.NASL
    descriptionUwsgi developers report : It was discovered that the uwsgi_expand_path function in utils.c in Unbit uWSGI, an application container server, has a stack-based buffer overflow via a large directory length that can cause a denial-of-service (application crash) or stack corruption.
    last seen2020-06-01
    modified2020-06-02
    plugin id106813
    published2018-02-14
    reporterThis script is Copyright (C) 2018 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/106813
    titleFreeBSD : uwsgi -- a stack-based buffer overflow (a8f25565-109e-11e8-8d41-97657151f8c2)
    code
    #
    # (C) Tenable Network Security, Inc.
    #
    # The descriptive text and package checks in this plugin were  
    # extracted from the FreeBSD VuXML database :
    #
    # Copyright 2003-2018 Jacques Vidrine and contributors
    #
    # Redistribution and use in source (VuXML) and 'compiled' forms (SGML,
    # HTML, PDF, PostScript, RTF and so forth) with or without modification,
    # are permitted provided that the following conditions are met:
    # 1. Redistributions of source code (VuXML) must retain the above
    #    copyright notice, this list of conditions and the following
    #    disclaimer as the first lines of this file unmodified.
    # 2. Redistributions in compiled form (transformed to other DTDs,
    #    published online in any format, converted to PDF, PostScript,
    #    RTF and other formats) must reproduce the above copyright
    #    notice, this list of conditions and the following disclaimer
    #    in the documentation and/or other materials provided with the
    #    distribution.
    # 
    # THIS DOCUMENTATION IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS"
    # AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
    # THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
    # PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
    # BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
    # OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
    # OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
    # BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
    # WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
    # OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS DOCUMENTATION,
    # EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
    #
    
    include("compat.inc");
    
    if (description)
    {
      script_id(106813);
      script_version("3.4");
      script_cvs_date("Date: 2018/11/10 11:49:47");
    
      script_cve_id("CVE-2018-6758");
    
      script_name(english:"FreeBSD : uwsgi -- a stack-based buffer overflow (a8f25565-109e-11e8-8d41-97657151f8c2)");
      script_summary(english:"Checks for updated package in pkg_info output");
    
      script_set_attribute(
        attribute:"synopsis", 
        value:"The remote FreeBSD host is missing a security-related update."
      );
      script_set_attribute(
        attribute:"description", 
        value:
    "Uwsgi developers report :
    
    It was discovered that the uwsgi_expand_path function in utils.c in
    Unbit uWSGI, an application container server, has a stack-based buffer
    overflow via a large directory length that can cause a
    denial-of-service (application crash) or stack corruption."
      );
      script_set_attribute(
        attribute:"see_also",
        value:"http://lists.unbit.it/pipermail/uwsgi/2018-February/008835.html"
      );
      script_set_attribute(
        attribute:"see_also",
        value:"https://lists.debian.org/debian-lts-announce/2018/02/msg00010.html"
      );
      # https://vuxml.freebsd.org/freebsd/a8f25565-109e-11e8-8d41-97657151f8c2.html
      script_set_attribute(
        attribute:"see_also",
        value:"http://www.nessus.org/u?4b09fcc6"
      );
      script_set_attribute(attribute:"solution", value:"Update the affected package.");
      script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P");
      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_attribute(attribute:"plugin_type", value:"local");
      script_set_attribute(attribute:"cpe", value:"p-cpe:/a:freebsd:freebsd:uwsgi");
      script_set_attribute(attribute:"cpe", value:"cpe:/o:freebsd:freebsd");
    
      script_set_attribute(attribute:"vuln_publication_date", value:"2018/02/06");
      script_set_attribute(attribute:"patch_publication_date", value:"2018/02/13");
      script_set_attribute(attribute:"plugin_publication_date", value:"2018/02/14");
      script_end_attributes();
    
      script_category(ACT_GATHER_INFO);
      script_copyright(english:"This script is Copyright (C) 2018 and is owned by Tenable, Inc. or an Affiliate thereof.");
      script_family(english:"FreeBSD Local Security Checks");
    
      script_dependencies("ssh_get_info.nasl");
      script_require_keys("Host/local_checks_enabled", "Host/FreeBSD/release", "Host/FreeBSD/pkg_info");
    
      exit(0);
    }
    
    
    include("audit.inc");
    include("freebsd_package.inc");
    
    
    if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
    if (!get_kb_item("Host/FreeBSD/release")) audit(AUDIT_OS_NOT, "FreeBSD");
    if (!get_kb_item("Host/FreeBSD/pkg_info")) audit(AUDIT_PACKAGE_LIST_MISSING);
    
    
    flag = 0;
    
    if (pkg_test(save_report:TRUE, pkg:"uwsgi<2.0.16")) flag++;
    
    if (flag)
    {
      if (report_verbosity > 0) security_hole(port:0, extra:pkg_report_get());
      else security_hole(0);
      exit(0);
    }
    else audit(AUDIT_HOST_NOT, "affected");
    
  • 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
  • NASL familyDebian Local Security Checks
    NASL idDEBIAN_DLA-1275.NASL
    descriptionIt was discovered that the uwsgi_expand_path function in utils.c in Unbit uWSGI, an application container server, has a stack-based buffer overflow via a large directory length that can cause a denial of service (application crash) or stack corruption. For Debian 7
    last seen2020-03-17
    modified2018-02-12
    plugin id106723
    published2018-02-12
    reporterThis script is Copyright (C) 2018-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/106723
    titleDebian DLA-1275-1 : uwsgi security update