Debian DSA-102-2 : at - daemon exploit

#%NASL_MIN_LEVEL 70300

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Debian Security Advisory DSA-102. The text 
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(14939);
  script_version("1.17");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/04");

  script_cve_id("CVE-2002-0004");
  script_xref(name:"DSA", value:"102");

  script_name(english:"Debian DSA-102-2 : at - daemon exploit");
  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:
"zen-parse found a bug in the current implementation of at which leads
into a heap corruption vulnerability which in turn could potentially
lead into an exploit of the daemon user."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.debian.org/security/2002/dsa-102"
  );
  script_set_attribute(
    attribute:"solution", 
    value:
"Upgrade the at packages.

Unfortunately, the bugfix from DSA 102-1 wasn't propagated properly
due to a packaging bug. While the file parsetime.y was fixed, and
yy.tab.c should be generated from it, yy.tab.c from the original
source was still used. This has been fixed in DSA-102-2."
  );
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:at");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:2.2");

  script_set_attribute(attribute:"patch_publication_date", value:"2002/01/16");
  script_set_attribute(attribute:"plugin_publication_date", value:"2004/09/29");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2004-2021 Tenable Network Security, Inc.");
  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:"2.2", prefix:"at", reference:"3.1.8-10.2")) flag++;

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