Debian DSA-1721-1 : libpam-krb5 - several vulnerabilities

2009-02-13T00:00:00
ID DEBIAN_DSA-1721.NASL
Type nessus
Reporter This script is Copyright (C) 2009-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
Modified 2020-07-02T00:00:00

Description

Several local vulnerabilities have been discovered in the PAM module for MIT Kerberos. The Common Vulnerabilities and Exposures project identifies the following problems :

  • CVE-2009-0360 Russ Allbery discovered that the Kerberos PAM module parsed configuration settings from environment variables when run from a setuid context. This could lead to local privilege escalation if an attacker points a setuid program using PAM authentication to a Kerberos setup under her control.

  • CVE-2009-0361 Derek Chan discovered that the Kerberos PAM module allows reinitialisation of user credentials when run from a setuid context, resulting in potential local denial of service by overwriting the credential cache file or to privilege escalation.

                                        
                                            #%NASL_MIN_LEVEL 80502
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Debian Security Advisory DSA-1721. The text 
# itself is copyright (C) Software in the Public Interest, Inc.
#

include("compat.inc");

if (description)
{
  script_id(35662);
  script_version("1.16");
  script_cvs_date("Date: 2019/08/02 13:32:21");

  script_cve_id("CVE-2009-0360", "CVE-2009-0361");
  script_xref(name:"DSA", value:"1721");

  script_name(english:"Debian DSA-1721-1 : libpam-krb5 - several vulnerabilities");
  script_summary(english:"Checks dpkg output for the updated package");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote Debian host is missing a security-related update."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"Several local vulnerabilities have been discovered in the PAM module
for MIT Kerberos. The Common Vulnerabilities and Exposures project
identifies the following problems :

  - CVE-2009-0360
    Russ Allbery discovered that the Kerberos PAM module
    parsed configuration settings from environment variables
    when run from a setuid context. This could lead to local
    privilege escalation if an attacker points a setuid
    program using PAM authentication to a Kerberos setup
    under her control.

  - CVE-2009-0361
    Derek Chan discovered that the Kerberos PAM module
    allows reinitialisation of user credentials when run
    from a setuid context, resulting in potential local
    denial of service by overwriting the credential cache
    file or to privilege escalation."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security-tracker.debian.org/tracker/CVE-2009-0360"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security-tracker.debian.org/tracker/CVE-2009-0361"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.debian.org/security/2009/dsa-1721"
  );
  script_set_attribute(
    attribute:"solution", 
    value:
"Upgrade the libpam-krb5 package.

For the stable distribution (etch), these problems have been fixed in
version 2.6-1etch1.

For the upcoming stable distribution (lenny), these problems have been
fixed in version 3.11-4."
  );
  script_set_cvss_base_vector("CVSS2#AV:L/AC:H/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_cwe_id(264, 287);

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libpam-krb5");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:4.0");

  script_set_attribute(attribute:"patch_publication_date", value:"2009/02/11");
  script_set_attribute(attribute:"plugin_publication_date", value:"2009/02/13");
  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:"Debian Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/Debian/release", "Host/Debian/dpkg-l");

  exit(0);
}


include("audit.inc");
include("debian_package.inc");


if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/Debian/release")) audit(AUDIT_OS_NOT, "Debian");
if (!get_kb_item("Host/Debian/dpkg-l")) audit(AUDIT_PACKAGE_LIST_MISSING);


flag = 0;
if (deb_check(release:"4.0", prefix:"libpam-krb5", reference:"2.6-1etch1")) flag++;

if (flag)
{
  if (report_verbosity > 0) security_warning(port:0, extra:deb_report_get());
  else security_warning(0);
  exit(0);
}
else audit(AUDIT_HOST_NOT, "affected");