Vulnerabilities > CVE-2009-1897 - Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability in Linux Kernel 2.6.30/2.6.30.1

047910
CVSS 0.0 - NONE
Attack vector
UNKNOWN
Attack complexity
UNKNOWN
Privileges required
UNKNOWN
Confidentiality impact
UNKNOWN
Integrity impact
UNKNOWN
Availability impact
UNKNOWN
linux
CWE-119
nessus
exploit available
NVD
Published: 2009-07-20
Updated: 2023-02-13

Summary

The tun_chr_poll function in drivers/net/tun.c in the tun subsystem in the Linux kernel 2.6.30 and 2.6.30.1, when the -fno-delete-null-pointer-checks gcc option is omitted, allows local users to gain privileges via vectors involving a NULL pointer dereference and an mmap of /dev/net/tun, a different vulnerability than CVE-2009-1894.

Vulnerable Configurations

Part Description Count
OS
Linux
9

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.

Exploit-Db

descriptionLinux Kernel 2.6.30 'tun_chr_pool()' NULL Pointer Dereference Vulnerability. CVE-2009-1897. Dos exploit for linux platform
idEDB-ID:33088
last seen2016-02-03
modified2009-06-17
published2009-06-17
reporterChristian Borntraeger
sourcehttps://www.exploit-db.com/download/33088/
titleLinux Kernel 2.6.30 - 'tun_chr_pool' NULL Pointer Dereference Vulnerability

Nessus

  • NASL familyFedora Local Security Checks
    NASL idFEDORA_2009-8144.NASL
    descriptionFix security bugs: CVE-2009-1895 CVE-2009-2406 CVE-2009-2407 Add -fno- delete-null-pointer-checks gcc compile flag to protect against issues similar to CVE-2009-1897. Fix virtio_blk driver bug (reported against Fedora 10.) iwl3945 wireless driver rfkill fixes. Fix DPMS on some nVidia adapters when using the nouveau driver. 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 seen2020-06-01
    modified2020-06-02
    plugin id40481
    published2009-08-05
    reporterThis script is Copyright (C) 2009-2019 Tenable Network Security, Inc.
    sourcehttps://www.tenable.com/plugins/nessus/40481
    titleFedora 11 : kernel-2.6.29.6-217.2.3.fc11 (2009-8144)
    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 2009-8144.
#

include("compat.inc");

if (description)
{
  script_id(40481);
  script_version ("1.16");
  script_cvs_date("Date: 2019/08/02 13:32:30");

  script_cve_id("CVE-2009-1895", "CVE-2009-2406", "CVE-2009-2407");
  script_bugtraq_id(35647, 35850, 35851);
  script_xref(name:"FEDORA", value:"2009-8144");

  script_name(english:"Fedora 11 : kernel-2.6.29.6-217.2.3.fc11 (2009-8144)");
  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 security bugs: CVE-2009-1895 CVE-2009-2406 CVE-2009-2407 Add -fno-
delete-null-pointer-checks gcc compile flag to protect against issues
similar to CVE-2009-1897. Fix virtio_blk driver bug (reported against
Fedora 10.) iwl3945 wireless driver rfkill fixes. Fix DPMS on some
nVidia adapters when using the nouveau driver.

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=511171"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.redhat.com/show_bug.cgi?id=512861"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.redhat.com/show_bug.cgi?id=512885"
  );
  # https://lists.fedoraproject.org/pipermail/package-announce/2009-August/027493.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?24db4f82"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Update the affected kernel package."
  );
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:ND/RL:OF/RC:ND");
  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_cwe_id(16, 119);

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fedoraproject:fedora:kernel");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:fedoraproject:fedora:11");

  script_set_attribute(attribute:"patch_publication_date", value:"2009/07/31");
  script_set_attribute(attribute:"plugin_publication_date", value:"2009/08/05");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2009-2019 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:"^11([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Fedora 11.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:"FC11", reference:"kernel-2.6.29.6-217.2.3.fc11")) 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, "kernel");
}
  • NASL familyFedora Local Security Checks
    NASL idFEDORA_2009-8264.NASL
    descriptionUpdate to linux kernel 2.6.27.29: http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.27.26 http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.27.27 http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.27.28 http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.27.29 Fixes security bugs: CVE-2009-1895 CVE-2009-2406 CVE-2009-2407 Adds -fno-delete- null-pointer-checks gcc compile flag to protect against issues similar to CVE-2009-1897. 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 seen2020-06-01
    modified2020-06-02
    plugin id40482
    published2009-08-05
    reporterThis script is Copyright (C) 2009-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/40482
    titleFedora 10 : kernel-2.6.27.29-170.2.78.fc10 (2009-8264)
    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 2009-8264.
#

include("compat.inc");

if (description)
{
  script_id(40482);
  script_version ("1.18");
  script_cvs_date("Date: 2019/08/02 13:32:30");

  script_cve_id("CVE-2009-1895", "CVE-2009-2406", "CVE-2009-2407");
  script_bugtraq_id(35647, 35850, 35851);
  script_xref(name:"FEDORA", value:"2009-8264");

  script_name(english:"Fedora 10 : kernel-2.6.27.29-170.2.78.fc10 (2009-8264)");
  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:
"Update to linux kernel 2.6.27.29:
http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.27.26
http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.27.27
http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.27.28
http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.27.29 Fixes
security bugs: CVE-2009-1895 CVE-2009-2406 CVE-2009-2407 Adds
-fno-delete- null-pointer-checks gcc compile flag to protect against
issues similar to CVE-2009-1897.

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."
  );
  # http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.27.26
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?221cc2c4"
  );
  # http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.27.27
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?97580674"
  );
  # http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.27.28
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?5b5c637f"
  );
  # http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.27.29
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?38d2b377"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.redhat.com/show_bug.cgi?id=511171"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.redhat.com/show_bug.cgi?id=512861"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.redhat.com/show_bug.cgi?id=512885"
  );
  # https://lists.fedoraproject.org/pipermail/package-announce/2009-August/027436.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?ee2323e4"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Update the affected kernel package."
  );
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:ND/RL:OF/RC:ND");
  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_cwe_id(16, 119);

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fedoraproject:fedora:kernel");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:fedoraproject:fedora:10");

  script_set_attribute(attribute:"patch_publication_date", value:"2009/08/04");
  script_set_attribute(attribute:"plugin_publication_date", value:"2009/08/05");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2009-2019 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:"^10([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Fedora 10.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:"FC10", reference:"kernel-2.6.27.29-170.2.78.fc10")) 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, "kernel");
}

Statements

contributorTomas Hoger
lastmodified2009-09-02
organizationRed Hat
statementRed Hat is aware of this issue and is tracking it via the following bug: https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=CVE-2009-1897 The flaw only affects the Red Hat Enterprise Linux 5.4 beta kernel, which includes a backport of the upstream bug fix introducing this flaw (git commit 33dccbb0). This issue did not affect the final released Red Hat Enterprise Linux 5.4 kernel. It is also possible to mitigate this flaw by ensuring that the permissions for /dev/net/tun is restricted to root only. This issue does not affect any other released kernel in any Red Hat product.

References