Vulnerabilities > CVE-2011-0427 - Improper Restriction of Operations Within the Bounds of A Memory Buffer vulnerability in TOR

047910
CVSS 6.8 - MEDIUM
Attack vector
NETWORK
Attack complexity
MEDIUM
Privileges required
NONE
Confidentiality impact
PARTIAL
Integrity impact
PARTIAL
Availability impact
PARTIAL
network
tor
CWE-119
nessus
NVD
Published: 2011-01-19
Updated: 2017-08-17

Summary

Heap-based buffer overflow in Tor before 0.2.1.29 and 0.2.2.x before 0.2.2.21-alpha allows remote attackers to cause a denial of service (memory corruption and application crash) or possibly execute arbitrary code via unspecified vectors.

Vulnerable Configurations

Part Description Count
Application
Tor
207

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.
  • Overflow Buffers
    Buffer Overflow attacks target improper or missing bounds checking on buffer operations, typically triggered by input injected by an attacker. As a consequence, an attacker is able to write past the boundaries of allocated buffer regions in memory, causing a program crash or potentially redirection of execution as per the attackers' choice.
  • Client-side Injection-induced Buffer Overflow
    This type of attack exploits a buffer overflow vulnerability in targeted client software through injection of malicious content from a custom-built hostile service.
  • Filter Failure through Buffer Overflow
    In this attack, the idea is to cause an active filter to fail by causing an oversized transaction. An attacker may try to feed overly long input strings to the program in an attempt to overwhelm the filter (by causing a buffer overflow) and hoping that the filter does not fail securely (i.e. the user input is let into the system unfiltered).
  • MIME Conversion
    An attacker exploits a weakness in the MIME conversion routine to cause a buffer overflow and gain control over the mail server machine. The MIME system is designed to allow various different information formats to be interpreted and sent via e-mail. Attack points exist when data are converted to MIME compatible format and back.

Nessus

  • NASL familyFedora Local Security Checks
    NASL idFEDORA_2011-0650.NASL
    description - Mon Jan 17 2011 Enrico Scholz <enrico.scholz at informatik.tu-chemnitz.de> - 0.2.1.29-1300 - updated to 0.2.1.29 (SECURITY) - CVE-2011-0427: heap overflow bug, potential remote code execution - Tue Dec 21 2010 Luke Macken <lmacken at redhat.com> - 0.2.1.28-1300 - updated to 0.2.1.28 (SECURITY: fixes a remotely exploitable heap overflow bug) - Fri Nov 26 2010 Enrico Scholz <enrico.scholz at informatik.tu-chemnitz.de> - 0.2.1.27-1300 - updated to 0.2.1.27 - work around broken chkconfig by adding dummy Default-Start: in -lsb (#647512) - Fri Nov 26 2010 Enrico Scholz <enrico.scholz at informatik.tu-chemnitz.de> - fixed
    last seen2020-06-01
    modified2020-06-02
    plugin id55002
    published2011-06-09
    reporterThis script is Copyright (C) 2011-2019 Tenable Network Security, Inc.
    sourcehttps://www.tenable.com/plugins/nessus/55002
    titleFedora 13 : tor-0.2.1.29-1300.fc13 (2011-0650)
    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 2011-0650.
#

include("compat.inc");

if (description)
{
  script_id(55002);
  script_version("1.10");
  script_cvs_date("Date: 2019/08/02 13:32:33");

  script_cve_id("CVE-2011-0015", "CVE-2011-0016", "CVE-2011-0427", "CVE-2011-0490", "CVE-2011-0491", "CVE-2011-0492", "CVE-2011-0493");
  script_bugtraq_id(45832, 45953);
  script_xref(name:"FEDORA", value:"2011-0650");

  script_name(english:"Fedora 13 : tor-0.2.1.29-1300.fc13 (2011-0650)");
  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:
"  - Mon Jan 17 2011 Enrico Scholz <enrico.scholz at
    informatik.tu-chemnitz.de> - 0.2.1.29-1300

    - updated to 0.2.1.29 (SECURITY)

    - CVE-2011-0427: heap overflow bug, potential remote
      code execution

    - Tue Dec 21 2010 Luke Macken <lmacken at redhat.com> -
      0.2.1.28-1300

    - updated to 0.2.1.28 (SECURITY: fixes a remotely
      exploitable heap overflow bug)

    - Fri Nov 26 2010 Enrico Scholz <enrico.scholz at
      informatik.tu-chemnitz.de> - 0.2.1.27-1300

    - updated to 0.2.1.27

    - work around broken chkconfig by adding dummy
      Default-Start: in -lsb (#647512)

    - Fri Nov 26 2010 Enrico Scholz <enrico.scholz at
      informatik.tu-chemnitz.de>

    - fixed 'limit' statement in upstart script

    - Tue Jun 1 2010 Enrico Scholz <enrico.scholz at
      informatik.tu-chemnitz.de> - 0.2.1.26-1300

    - updated to 0.2.1.26

    - removed workaround to install lsb initscript because
      parts of the underlying problem have been fixed in
      redhat-lsb and the remaining ones were solved by
      previous commit

  - Tue Jun 1 2010 Enrico Scholz <enrico.scholz at
    informatik.tu-chemnitz.de> - 0.2.1.25-1301

    - removed $local_fs dependency in -lsb initscript to
      workaround buggy redhat-lsb; $remote_fs should imply
      it

  - Thu Mar 18 2010 Enrico Scholz <enrico.scholz at
    informatik.tu-chemnitz.de> - 0.2.1.25-1300

    - updated to 0.2.1.25

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=671259"
  );
  # https://lists.fedoraproject.org/pipermail/package-announce/2011-June/061286.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?204d659a"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected tor 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:ND/RL:OF/RC:C");
  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fedoraproject:fedora:tor");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:fedoraproject:fedora:13");

  script_set_attribute(attribute:"patch_publication_date", value:"2011/01/21");
  script_set_attribute(attribute:"plugin_publication_date", value:"2011/06/09");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2011-2019 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:"^13([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Fedora 13.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:"FC13", reference:"tor-0.2.1.29-1300.fc13")) flag++;


if (flag)
{
  if (report_verbosity > 0) security_warning(port:0, extra:rpm_report_get());
  else security_warning(0);
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "tor");
}
  • NASL familyFedora Local Security Checks
    NASL idFEDORA_2011-7972.NASL
    description - Thu Mar 17 2011 Enrico Scholz <enrico.scholz at informatik.tu-chemnitz.de> - 0.2.1.30-1400 - updated to 0.2.1.30 - Mon Jan 17 2011 Enrico Scholz <enrico.scholz at informatik.tu-chemnitz.de> - 0.2.1.29-1400 - updated to 0.2.1.29 (SECURITY) - CVE-2011-0427: heap overflow bug, potential remote code execution - Tue Dec 21 2010 Luke Macken <lmacken at redhat.com> - 0.2.1.28-1400 - updated to 0.2.1.28 (SECURITY: fixes a remotely exploitable heap overflow bug) - Fri Nov 26 2010 Enrico Scholz <enrico.scholz at informatik.tu-chemnitz.de> - 0.2.1.27-1400 - updated to 0.2.1.27 - work around broken chkconfig by adding dummy Default-Start: in -lsb (#647512) - Fri Nov 26 2010 Enrico Scholz <enrico.scholz at informatik.tu-chemnitz.de> - 0.2.1.26-1401 - fixed
    last seen2020-06-01
    modified2020-06-02
    plugin id54981
    published2011-06-07
    reporterThis script is Copyright (C) 2011-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/54981
    titleFedora 14 : tor-0.2.1.30-1400.fc14 (2011-7972)
    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 2011-7972.
#

include("compat.inc");

if (description)
{
  script_id(54981);
  script_version("1.10");
  script_cvs_date("Date: 2019/08/02 13:32:35");

  script_cve_id("CVE-2011-1924");
  script_bugtraq_id(46618);
  script_xref(name:"FEDORA", value:"2011-7972");

  script_name(english:"Fedora 14 : tor-0.2.1.30-1400.fc14 (2011-7972)");
  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:
"  - Thu Mar 17 2011 Enrico Scholz <enrico.scholz at
    informatik.tu-chemnitz.de> - 0.2.1.30-1400

    - updated to 0.2.1.30

    - Mon Jan 17 2011 Enrico Scholz <enrico.scholz at
      informatik.tu-chemnitz.de> - 0.2.1.29-1400

    - updated to 0.2.1.29 (SECURITY)

    - CVE-2011-0427: heap overflow bug, potential remote
      code execution

    - Tue Dec 21 2010 Luke Macken <lmacken at redhat.com> -
      0.2.1.28-1400

    - updated to 0.2.1.28 (SECURITY: fixes a remotely
      exploitable heap overflow bug)

    - Fri Nov 26 2010 Enrico Scholz <enrico.scholz at
      informatik.tu-chemnitz.de> - 0.2.1.27-1400

    - updated to 0.2.1.27

    - work around broken chkconfig by adding dummy
      Default-Start: in -lsb (#647512)

    - Fri Nov 26 2010 Enrico Scholz <enrico.scholz at
      informatik.tu-chemnitz.de> - 0.2.1.26-1401

    - fixed 'limit' statement in upstart script

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=705194"
  );
  # https://lists.fedoraproject.org/pipermail/package-announce/2011-June/061258.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?ee118a89"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected tor package.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fedoraproject:fedora:tor");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:fedoraproject:fedora:14");

  script_set_attribute(attribute:"patch_publication_date", value:"2011/06/07");
  script_set_attribute(attribute:"plugin_publication_date", value:"2011/06/07");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2011-2019 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 = 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:"^14([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Fedora 14.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:"FC14", reference:"tor-0.2.1.30-1400.fc14")) flag++;


if (flag)
{
  if (report_verbosity > 0) security_warning(port:0, extra:rpm_report_get());
  else security_warning(0);
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "tor");
}
  • NASL familyFedora Local Security Checks
    NASL idFEDORA_2011-0642.NASL
    description - Mon Jan 17 2011 Enrico Scholz <enrico.scholz at informatik.tu-chemnitz.de> - 0.2.1.29-1400 - updated to 0.2.1.29 (SECURITY) - CVE-2011-0427: heap overflow bug, potential remote code execution - Tue Dec 21 2010 Luke Macken <lmacken at redhat.com> - 0.2.1.28-1400 - updated to 0.2.1.28 (SECURITY: fixes a remotely exploitable heap overflow bug) - Fri Nov 26 2010 Enrico Scholz <enrico.scholz at informatik.tu-chemnitz.de> - 0.2.1.27-1400 - updated to 0.2.1.27 - work around broken chkconfig by adding dummy Default-Start: in -lsb (#647512) - Fri Nov 26 2010 Enrico Scholz <enrico.scholz at informatik.tu-chemnitz.de> - 0.2.1.26-1401 - fixed
    last seen2020-06-01
    modified2020-06-02
    plugin id53901
    published2011-05-16
    reporterThis script is Copyright (C) 2011-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/53901
    titleFedora 14 : tor-0.2.1.29-1400.fc14 (2011-0642)
  • NASL familyDebian Local Security Checks
    NASL idDEBIAN_DSA-2148.NASL
    descriptionThe developers of Tor, an anonymizing overlay network for TCP, found three security issues during a security audit. A heap overflow allowed the execution of arbitrary code (CVE-2011-0427 ), a denial of service vulnerability was found in the zlib compression handling and some key memory was incorrectly zeroed out before being freed. The latter two issues do not yet have CVE identifiers assigned. The Debian Security Tracker will be updated once they
    last seen2020-03-17
    modified2011-01-18
    plugin id51559
    published2011-01-18
    reporterThis script is Copyright (C) 2011-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/51559
    titleDebian DSA-2148-1 : tor - several vulnerabilities
  • NASL familyFreeBSD Local Security Checks
    NASL idFREEBSD_PKG_38BDF10E229311E0BFA4001676740879.NASL
    descriptionThe Tor Project reports : A remote heap overflow vulnerability that can allow remote code execution. Other fixes address a variety of assert and crash bugs, most of which we think are hard to exploit remotely. All Tor users should upgrade.
    last seen2020-06-01
    modified2020-06-02
    plugin id51560
    published2011-01-18
    reporterThis script is Copyright (C) 2011-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/51560
    titleFreeBSD : tor -- remote code execution and crash (38bdf10e-2293-11e0-bfa4-001676740879)
  • NASL familyGentoo Local Security Checks
    NASL idGENTOO_GLSA-201110-13.NASL
    descriptionThe remote host is affected by the vulnerability described in GLSA-201110-13 (Tor: Multiple vulnerabilities) Multiple vulnerabilities have been discovered in Tor. Please review the CVE identifiers referenced below for details. Impact : A remote unauthenticated attacker may be able to execute arbitrary code with the privileges of the Tor process or create a Denial of Service. Workaround : There is no known workaround at this time.
    last seen2020-06-01
    modified2020-06-02
    plugin id56549
    published2011-10-19
    reporterThis script is Copyright (C) 2011-2018 Tenable Network Security, Inc.
    sourcehttps://www.tenable.com/plugins/nessus/56549
    titleGLSA-201110-13 : Tor: Multiple vulnerabilities

References