CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:C/I:C/A:C
EPSS
Percentile
87.2%
An updated lynx package that corrects two security issues is now available for Red Hat Enterprise Linux 2.1, 3, 4, and 5.
This update has been rated as having important security impact by the Red Hat Security Response Team.
Lynx is a text-based Web browser.
An arbitrary command execution flaw was found in the Lynx βlynxcgi:β URI handler. An attacker could create a web page redirecting to a malicious URL that could execute arbitrary code as the user running Lynx in the non-default βAdvancedβ user mode. (CVE-2008-4690)
Note: In these updated lynx packages, Lynx will always prompt users before loading a βlynxcgi:β URI. Additionally, the default lynx.cfg configuration file now marks all βlynxcgi:β URIs as untrusted by default.
A flaw was found in a way Lynx handled β.mailcapβ and β.mime.typesβ configuration files. Files in the browserβs current working directory were opened before those in the userβs home directory. A local attacker, able to convince a user to run Lynx in a directory under their control, could possibly execute arbitrary commands as the user running Lynx. (CVE-2006-7234)
All users of Lynx are advised to upgrade to this updated package, which contains backported patches correcting these issues.
#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Red Hat Security Advisory RHSA-2008:0965 and
# CentOS Errata and Security Advisory 2008:0965 respectively.
#
include('deprecated_nasl_level.inc');
include('compat.inc');
if (description)
{
script_id(34503);
script_version("1.18");
script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/04");
script_cve_id("CVE-2006-7234", "CVE-2008-4690");
script_bugtraq_id(15395);
script_xref(name:"RHSA", value:"2008:0965");
script_name(english:"CentOS 3 / 4 / 5 : lynx (CESA-2008:0965)");
script_summary(english:"Checks rpm output for the updated package");
script_set_attribute(
attribute:"synopsis",
value:"The remote CentOS host is missing a security update."
);
script_set_attribute(
attribute:"description",
value:
"An updated lynx package that corrects two security issues is now
available for Red Hat Enterprise Linux 2.1, 3, 4, and 5.
This update has been rated as having important security impact by the
Red Hat Security Response Team.
Lynx is a text-based Web browser.
An arbitrary command execution flaw was found in the Lynx 'lynxcgi:'
URI handler. An attacker could create a web page redirecting to a
malicious URL that could execute arbitrary code as the user running
Lynx in the non-default 'Advanced' user mode. (CVE-2008-4690)
Note: In these updated lynx packages, Lynx will always prompt users
before loading a 'lynxcgi:' URI. Additionally, the default lynx.cfg
configuration file now marks all 'lynxcgi:' URIs as untrusted by
default.
A flaw was found in a way Lynx handled '.mailcap' and '.mime.types'
configuration files. Files in the browser's current working directory
were opened before those in the user's home directory. A local
attacker, able to convince a user to run Lynx in a directory under
their control, could possibly execute arbitrary commands as the user
running Lynx. (CVE-2006-7234)
All users of Lynx are advised to upgrade to this updated package,
which contains backported patches correcting these issues."
);
# https://lists.centos.org/pipermail/centos-announce/2008-October/015350.html
script_set_attribute(
attribute:"see_also",
value:"http://www.nessus.org/u?02eef948"
);
# https://lists.centos.org/pipermail/centos-announce/2008-October/015351.html
script_set_attribute(
attribute:"see_also",
value:"http://www.nessus.org/u?c1525496"
);
# https://lists.centos.org/pipermail/centos-announce/2008-October/015352.html
script_set_attribute(
attribute:"see_also",
value:"http://www.nessus.org/u?a7b1b1d7"
);
# https://lists.centos.org/pipermail/centos-announce/2008-October/015353.html
script_set_attribute(
attribute:"see_also",
value:"http://www.nessus.org/u?5fae6bf1"
);
# https://lists.centos.org/pipermail/centos-announce/2008-October/015358.html
script_set_attribute(
attribute:"see_also",
value:"http://www.nessus.org/u?5220406d"
);
# https://lists.centos.org/pipermail/centos-announce/2008-October/015359.html
script_set_attribute(
attribute:"see_also",
value:"http://www.nessus.org/u?0706c97f"
);
# https://lists.centos.org/pipermail/centos-announce/2008-October/015361.html
script_set_attribute(
attribute:"see_also",
value:"http://www.nessus.org/u?1efb3594"
);
# https://lists.centos.org/pipermail/centos-announce/2008-October/015362.html
script_set_attribute(
attribute:"see_also",
value:"http://www.nessus.org/u?86c96ef1"
);
script_set_attribute(attribute:"solution", value:"Update the affected lynx package.");
script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C");
script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
script_set_attribute(attribute:"exploit_available", value:"true");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:lynx");
script_set_attribute(attribute:"cpe", value:"cpe:/o:centos:centos:3");
script_set_attribute(attribute:"cpe", value:"cpe:/o:centos:centos:4");
script_set_attribute(attribute:"cpe", value:"cpe:/o:centos:centos:5");
script_set_attribute(attribute:"vuln_publication_date", value:"2008/10/22");
script_set_attribute(attribute:"patch_publication_date", value:"2008/10/31");
script_set_attribute(attribute:"plugin_publication_date", value:"2008/10/28");
script_set_attribute(attribute:"generated_plugin", value:"current");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_copyright(english:"This script is Copyright (C) 2008-2021 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_family(english:"CentOS Local Security Checks");
script_dependencies("ssh_get_info.nasl");
script_require_keys("Host/local_checks_enabled", "Host/CentOS/release", "Host/CentOS/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/CentOS/release");
if (isnull(release) || "CentOS" >!< release) audit(AUDIT_OS_NOT, "CentOS");
os_ver = pregmatch(pattern: "CentOS(?: Linux)? release ([0-9]+)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "CentOS");
os_ver = os_ver[1];
if (! preg(pattern:"^(3|4|5)([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "CentOS 3.x / 4.x / 5.x", "CentOS " + os_ver);
if (!get_kb_item("Host/CentOS/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);
cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ("x86_64" >!< cpu && "ia64" >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "CentOS", cpu);
flag = 0;
if (rpm_check(release:"CentOS-3", reference:"lynx-2.8.5-11.3")) flag++;
if (rpm_check(release:"CentOS-4", cpu:"i386", reference:"lynx-2.8.5-18.2.el4_7.1")) flag++;
if (rpm_check(release:"CentOS-4", cpu:"ia64", reference:"lynx-2.8.5-18.2.c4.1")) flag++;
if (rpm_check(release:"CentOS-4", cpu:"x86_64", reference:"lynx-2.8.5-18.2.el4_7.1")) flag++;
if (rpm_check(release:"CentOS-5", reference:"lynx-2.8.5-28.1.el5_2.1")) 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, "lynx");
}
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-7234
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-4690
www.nessus.org/u?02eef948
www.nessus.org/u?0706c97f
www.nessus.org/u?1efb3594
www.nessus.org/u?5220406d
www.nessus.org/u?5fae6bf1
www.nessus.org/u?86c96ef1
www.nessus.org/u?a7b1b1d7
www.nessus.org/u?c1525496