Vulnerabilities > CVE-2011-3154 - Link Following vulnerability in Canonical Ubuntu Linux and Update-Manager

047910
CVSS 1.9 - LOW
Attack vector
LOCAL
Attack complexity
MEDIUM
Privileges required
NONE
Confidentiality impact
PARTIAL
Integrity impact
NONE
Availability impact
NONE
local
canonical
CWE-59
nessus

Summary

DistUpgrade/DistUpgradeViewKDE.py in Update Manager before 1:0.87.31.1, 1:0.134.x before 1:0.134.11.1, 1:0.142.x before 1:0.142.23.1, 1:0.150.x before 1:0.150.5.1, and 1:0.152.x before 1:0.152.25.5 does not properly create temporary files, which allows local users to obtain the XAUTHORITY file content for a user via a symlink attack on the temporary file.

Common Attack Pattern Enumeration and Classification (CAPEC)

  • Symlink Attack
    An attacker positions a symbolic link in such a manner that the targeted user or application accesses the link's endpoint, assuming that it is accessing a file with the link's name. The endpoint file may be either output or input. If the file is output, the result is that the endpoint is modified, instead of a file at the intended location. Modifications to the endpoint file may include appending, overwriting, corrupting, changing permissions, or other modifications. In some variants of this attack the attacker may be able to control the change to a file while in other cases they cannot. The former is especially damaging since the attacker may be able to grant themselves increased privileges or insert false information, but the latter can also be damaging as it can expose sensitive information or corrupt or destroy vital system or application files. Alternatively, the endpoint file may serve as input to the targeted application. This can be used to feed malformed input into the target or to cause the target to process different information, possibly allowing the attacker to control the actions of the target or to cause the target to expose information to the attacker. Moreover, the actions taken on the endpoint file are undertaken with the permissions of the targeted user or application, which may exceed the permissions that the attacker would normally have.
  • Accessing, Modifying or Executing Executable Files
    An attack of this type exploits a system's configuration that allows an attacker to either directly access an executable file, for example through shell access; or in a possible worst case allows an attacker to upload a file and then execute it. Web servers, ftp servers, and message oriented middleware systems which have many integration points are particularly vulnerable, because both the programmers and the administrators must be in synch regarding the interfaces and the correct privileges for each interface.
  • Leverage Executable Code in Non-Executable Files
    An attack of this type exploits a system's trust in configuration and resource files, when the executable loads the resource (such as an image file or configuration file) the attacker has modified the file to either execute malicious code directly or manipulate the target process (e.g. application server) to execute based on the malicious configuration parameters. Since systems are increasingly interrelated mashing up resources from local and remote sources the possibility of this attack occurring is high. The attack can be directed at a client system, such as causing buffer overrun through loading seemingly benign image files, as in Microsoft Security Bulletin MS04-028 where specially crafted JPEG files could cause a buffer overrun once loaded into the browser. Another example targets clients reading pdf files. In this case the attacker simply appends javascript to the end of a legitimate url for a pdf (http://www.gnucitizen.org/blog/danger-danger-danger/) http://path/to/pdf/file.pdf#whatever_name_you_want=javascript:your_code_here The client assumes that they are reading a pdf, but the attacker has modified the resource and loaded executable javascript into the client's browser process. The attack can also target server processes. The attacker edits the resource or configuration file, for example a web.xml file used to configure security permissions for a J2EE app server, adding role name "public" grants all users with the public role the ability to use the administration functionality. The server trusts its configuration file to be correct, but when they are manipulated, the attacker gains full control.
  • 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.

Nessus

  • NASL familyUbuntu Local Security Checks
    NASL idUBUNTU_USN-1284-2.NASL
    descriptionUSN-1284-1 fixed vulnerabilities in Update Manager. One of the fixes introduced a regression for Kubuntu users attempting to upgrade to a newer Ubuntu release. This update fixes the problem. We apologize for the inconvenience. David Black discovered that Update Manager incorrectly extracted the downloaded upgrade tarball before verifying its GPG signature. If a remote attacker were able to perform a man-in-the-middle attack, this flaw could potentially be used to replace arbitrary files. (CVE-2011-3152) David Black discovered that Update Manager created a temporary directory in an insecure fashion. A local attacker could possibly use this flaw to read the XAUTHORITY file of the user performing the upgrade. (CVE-2011-3154) This update also adds a hotfix to Update Notifier to handle cases where the upgrade is being performed from CD media. Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen2020-06-01
    modified2020-06-02
    plugin id57997
    published2012-02-17
    reporterUbuntu Security Notice (C) 2012-2019 Canonical, Inc. / NASL script (C) 2012-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/57997
    titleUbuntu 8.04 LTS / 10.04 LTS / 10.10 / 11.04 / 11.10 : update-manager regression (USN-1284-2)
    code
    #
    # (C) Tenable Network Security, Inc.
    #
    # The descriptive text and package checks in this plugin were
    # extracted from Ubuntu Security Notice USN-1284-2. The text 
    # itself is copyright (C) Canonical, Inc. See 
    # <http://www.ubuntu.com/usn/>. Ubuntu(R) is a registered 
    # trademark of Canonical, Inc.
    #
    
    include("compat.inc");
    
    if (description)
    {
      script_id(57997);
      script_version("1.8");
      script_cvs_date("Date: 2019/09/19 12:54:27");
    
      script_cve_id("CVE-2011-3152", "CVE-2011-3154");
      script_xref(name:"USN", value:"1284-2");
    
      script_name(english:"Ubuntu 8.04 LTS / 10.04 LTS / 10.10 / 11.04 / 11.10 : update-manager regression (USN-1284-2)");
      script_summary(english:"Checks dpkg output for updated package.");
    
      script_set_attribute(
        attribute:"synopsis", 
        value:"The remote Ubuntu host is missing a security-related patch."
      );
      script_set_attribute(
        attribute:"description", 
        value:
    "USN-1284-1 fixed vulnerabilities in Update Manager. One of the fixes
    introduced a regression for Kubuntu users attempting to upgrade to a
    newer Ubuntu release. This update fixes the problem.
    
    We apologize for the inconvenience.
    
    David Black discovered that Update Manager incorrectly extracted the
    downloaded upgrade tarball before verifying its GPG signature. If a
    remote attacker were able to perform a man-in-the-middle attack, this
    flaw could potentially be used to replace arbitrary files.
    (CVE-2011-3152)
    
    David Black discovered that Update Manager created a
    temporary directory in an insecure fashion. A local attacker
    could possibly use this flaw to read the XAUTHORITY file of
    the user performing the upgrade. (CVE-2011-3154)
    
    This update also adds a hotfix to Update Notifier to handle
    cases where the upgrade is being performed from CD media.
    
    Note that Tenable Network Security has extracted the preceding
    description block directly from the Ubuntu 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://usn.ubuntu.com/1284-2/"
      );
      script_set_attribute(
        attribute:"solution", 
        value:"Update the affected update-manager-core package."
      );
      script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:N");
    
      script_set_attribute(attribute:"plugin_type", value:"local");
      script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:update-manager-core");
      script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:10.04:-:lts");
      script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:10.10");
      script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:11.04");
      script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:11.10");
      script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:8.04:-:lts");
    
      script_set_attribute(attribute:"vuln_publication_date", value:"2014/04/17");
      script_set_attribute(attribute:"patch_publication_date", value:"2012/02/16");
      script_set_attribute(attribute:"plugin_publication_date", value:"2012/02/17");
      script_set_attribute(attribute:"generated_plugin", value:"current");
      script_end_attributes();
    
      script_category(ACT_GATHER_INFO);
      script_copyright(english:"Ubuntu Security Notice (C) 2012-2019 Canonical, Inc. / NASL script (C) 2012-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");
      script_family(english:"Ubuntu Local Security Checks");
    
      script_dependencies("ssh_get_info.nasl");
      script_require_keys("Host/cpu", "Host/Ubuntu", "Host/Ubuntu/release", "Host/Debian/dpkg-l");
    
      exit(0);
    }
    
    
    include("audit.inc");
    include("ubuntu.inc");
    include("misc_func.inc");
    
    if ( ! get_kb_item("Host/local_checks_enabled") ) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
    release = get_kb_item("Host/Ubuntu/release");
    if ( isnull(release) ) audit(AUDIT_OS_NOT, "Ubuntu");
    release = chomp(release);
    if (! preg(pattern:"^(8\.04|10\.04|10\.10|11\.04|11\.10)$", string:release)) audit(AUDIT_OS_NOT, "Ubuntu 8.04 / 10.04 / 10.10 / 11.04 / 11.10", "Ubuntu " + release);
    if ( ! get_kb_item("Host/Debian/dpkg-l") ) 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, "Ubuntu", cpu);
    
    flag = 0;
    
    if (ubuntu_check(osver:"8.04", pkgname:"update-manager-core", pkgver:"1:0.87.33")) flag++;
    if (ubuntu_check(osver:"10.04", pkgname:"update-manager-core", pkgver:"1:0.134.11.2")) flag++;
    if (ubuntu_check(osver:"10.10", pkgname:"update-manager-core", pkgver:"1:0.142.23.2")) flag++;
    if (ubuntu_check(osver:"11.04", pkgname:"update-manager-core", pkgver:"1:0.150.5.2")) flag++;
    if (ubuntu_check(osver:"11.10", pkgname:"update-manager-core", pkgver:"1:0.152.25.8")) flag++;
    
    if (flag)
    {
      security_report_v4(
        port       : 0,
        severity   : SECURITY_WARNING,
        extra      : ubuntu_report_get()
      );
      exit(0);
    }
    else
    {
      tested = ubuntu_pkg_tests_get();
      if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
      else audit(AUDIT_PACKAGE_NOT_INSTALLED, "update-manager-core");
    }
    
  • NASL familyUbuntu Local Security Checks
    NASL idUBUNTU_USN-1284-1.NASL
    descriptionDavid Black discovered that Update Manager incorrectly extracted the downloaded upgrade tarball before verifying its GPG signature. If a remote attacker were able to perform a man-in-the-middle attack, this flaw could potentially be used to replace arbitrary files. (CVE-2011-3152) David Black discovered that Update Manager created a temporary directory in an insecure fashion. A local attacker could possibly use this flaw to read the XAUTHORITY file of the user performing the upgrade. (CVE-2011-3154) This update also adds a hotfix to Update Notifier to handle cases where the upgrade is being performed from CD media. Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen2020-06-01
    modified2020-06-02
    plugin id56971
    published2011-11-29
    reporterUbuntu Security Notice (C) 2011-2019 Canonical, Inc. / NASL script (C) 2011-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/56971
    titleUbuntu 8.04 LTS / 10.04 LTS / 10.10 / 11.04 / 11.10 : update-manager vulnerabilities (USN-1284-1)
    code
    #
    # (C) Tenable Network Security, Inc.
    #
    # The descriptive text and package checks in this plugin were
    # extracted from Ubuntu Security Notice USN-1284-1. The text 
    # itself is copyright (C) Canonical, Inc. See 
    # <http://www.ubuntu.com/usn/>. Ubuntu(R) is a registered 
    # trademark of Canonical, Inc.
    #
    
    include("compat.inc");
    
    if (description)
    {
      script_id(56971);
      script_version("1.9");
      script_cvs_date("Date: 2019/09/19 12:54:27");
    
      script_cve_id("CVE-2011-3152", "CVE-2011-3154");
      script_xref(name:"USN", value:"1284-1");
    
      script_name(english:"Ubuntu 8.04 LTS / 10.04 LTS / 10.10 / 11.04 / 11.10 : update-manager vulnerabilities (USN-1284-1)");
      script_summary(english:"Checks dpkg output for updated packages.");
    
      script_set_attribute(
        attribute:"synopsis", 
        value:
    "The remote Ubuntu host is missing one or more security-related
    patches."
      );
      script_set_attribute(
        attribute:"description", 
        value:
    "David Black discovered that Update Manager incorrectly extracted the
    downloaded upgrade tarball before verifying its GPG signature. If a
    remote attacker were able to perform a man-in-the-middle attack, this
    flaw could potentially be used to replace arbitrary files.
    (CVE-2011-3152)
    
    David Black discovered that Update Manager created a temporary
    directory in an insecure fashion. A local attacker could possibly use
    this flaw to read the XAUTHORITY file of the user performing the
    upgrade. (CVE-2011-3154)
    
    This update also adds a hotfix to Update Notifier to handle cases
    where the upgrade is being performed from CD media.
    
    Note that Tenable Network Security has extracted the preceding
    description block directly from the Ubuntu 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://usn.ubuntu.com/1284-1/"
      );
      script_set_attribute(
        attribute:"solution", 
        value:
    "Update the affected auto-upgrade-tester, update-manager and / or
    update-notifier packages."
      );
      script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:N");
    
      script_set_attribute(attribute:"plugin_type", value:"local");
      script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:auto-upgrade-tester");
      script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:update-manager");
      script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:update-notifier");
      script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:10.04:-:lts");
      script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:10.10");
      script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:11.04");
      script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:11.10");
      script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:8.04:-:lts");
    
      script_set_attribute(attribute:"vuln_publication_date", value:"2014/04/17");
      script_set_attribute(attribute:"patch_publication_date", value:"2011/11/28");
      script_set_attribute(attribute:"plugin_publication_date", value:"2011/11/29");
      script_set_attribute(attribute:"generated_plugin", value:"current");
      script_end_attributes();
    
      script_category(ACT_GATHER_INFO);
      script_copyright(english:"Ubuntu Security Notice (C) 2011-2019 Canonical, Inc. / NASL script (C) 2011-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");
      script_family(english:"Ubuntu Local Security Checks");
    
      script_dependencies("ssh_get_info.nasl");
      script_require_keys("Host/cpu", "Host/Ubuntu", "Host/Ubuntu/release", "Host/Debian/dpkg-l");
    
      exit(0);
    }
    
    
    include("audit.inc");
    include("ubuntu.inc");
    include("misc_func.inc");
    
    if ( ! get_kb_item("Host/local_checks_enabled") ) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
    release = get_kb_item("Host/Ubuntu/release");
    if ( isnull(release) ) audit(AUDIT_OS_NOT, "Ubuntu");
    release = chomp(release);
    if (! preg(pattern:"^(8\.04|10\.04|10\.10|11\.04|11\.10)$", string:release)) audit(AUDIT_OS_NOT, "Ubuntu 8.04 / 10.04 / 10.10 / 11.04 / 11.10", "Ubuntu " + release);
    if ( ! get_kb_item("Host/Debian/dpkg-l") ) 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, "Ubuntu", cpu);
    
    flag = 0;
    
    if (ubuntu_check(osver:"8.04", pkgname:"update-manager", pkgver:"1:0.87.31.1")) flag++;
    if (ubuntu_check(osver:"10.04", pkgname:"auto-upgrade-tester", pkgver:"1:0.134.11.1")) flag++;
    if (ubuntu_check(osver:"10.04", pkgname:"update-notifier", pkgver:"0.99.3ubuntu0.1")) flag++;
    if (ubuntu_check(osver:"10.10", pkgname:"update-manager", pkgver:"1:0.142.23.1")) flag++;
    if (ubuntu_check(osver:"10.10", pkgname:"update-notifier", pkgver:"0.105ubuntu1.1")) flag++;
    if (ubuntu_check(osver:"11.04", pkgname:"update-manager", pkgver:"1:0.150.5.1")) flag++;
    if (ubuntu_check(osver:"11.04", pkgname:"update-notifier", pkgver:"0.111ubuntu2.1")) flag++;
    if (ubuntu_check(osver:"11.10", pkgname:"update-manager", pkgver:"1:0.152.25.5")) flag++;
    
    if (flag)
    {
      security_report_v4(
        port       : 0,
        severity   : SECURITY_WARNING,
        extra      : ubuntu_report_get()
      );
      exit(0);
    }
    else
    {
      tested = ubuntu_pkg_tests_get();
      if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
      else audit(AUDIT_PACKAGE_NOT_INSTALLED, "auto-upgrade-tester / update-manager / update-notifier");
    }