FreeBSD Ports: krb5

# SPDX-FileCopyrightText: 2011 E-Soft Inc.
# Some text descriptions might be excerpted from (a) referenced
# source(s), and are Copyright (C) by the respective right holder(s).
#
# SPDX-License-Identifier: GPL-2.0-only

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.69597");
  script_version("2023-07-26T05:05:09+0000");
  script_tag(name:"last_modification", value:"2023-07-26 05:05:09 +0000 (Wed, 26 Jul 2023)");
  script_tag(name:"creation_date", value:"2011-05-12 19:21:50 +0200 (Thu, 12 May 2011)");
  script_tag(name:"cvss_base", value:"5.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:N/I:N/A:P");
  script_cve_id("CVE-2011-0281", "CVE-2011-0282", "CVE-2011-0283");
  script_name("FreeBSD Ports: krb5");
  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2011 E-Soft Inc.");
  script_family("FreeBSD Local Security Checks");
  script_dependencies("gather-package-list.nasl");
  script_mandatory_keys("ssh/login/freebsd", "ssh/login/freebsdrel");

  script_tag(name:"insight", value:"The following package is affected: krb5

CVE-2011-0281
The unparse implementation in the Key Distribution Center (KDC) in MIT
Kerberos 5 (aka krb5) 1.6.x through 1.9, when an LDAP backend is used,
allows remote attackers to cause a denial of service (file descriptor
exhaustion and daemon hang) via a principal name that triggers use of
a backslash escape sequence, as demonstrated by a \n sequence.

CVE-2011-0282
The Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) 1.6.x
through 1.9, when an LDAP backend is used, allows remote attackers to
cause a denial of service (NULL pointer dereference or buffer
over-read, and daemon crash) via a crafted principal name.

CVE-2011-0283
The Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) 1.9
allows remote attackers to cause a denial of service (NULL pointer
dereference and daemon crash) via a malformed request packet that does
not trigger a response packet.");

  script_tag(name:"solution", value:"Update your system with the appropriate patches or
  software upgrades.");

  script_xref(name:"URL", value:"http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2011-002.txt");
  script_xref(name:"URL", value:"http://www.vuxml.org/freebsd/4ab413ea-66ce-11e0-bf05-d445f3aa24f0.html");

  script_tag(name:"summary", value:"The remote host is missing an update to the system
  as announced in the referenced advisory.");

  script_tag(name:"qod_type", value:"package");
  script_tag(name:"solution_type", value:"VendorFix");

  exit(0);
}

include("revisions-lib.inc");
include("pkg-lib-bsd.inc");

vuln = FALSE;
txt = "";

bver = portver(pkg:"krb5");
if(!isnull(bver) && revcomp(a:bver, b:"1.6")>=0 && revcomp(a:bver, b:"1.9")<=0) {
  txt += 'Package krb5 version ' + bver + ' is installed which is known to be vulnerable.\n';
  vuln = TRUE;
}

if(vuln) {
  security_message(data:txt);
} else if (__pkg_match) {
  exit(99);
}