Debian DSA-2085-1 : lftp - missing input validation

2010-08-05T00:00:00
ID DEBIAN_DSA-2085.NASL
Type nessus
Reporter This script is Copyright (C) 2010-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
Modified 2020-02-02T00:00:00

Description

It was discovered that in lftp, a command-line HTTP/FTP client, there is no proper validation of the filename provided by the server through the Content-Disposition header; attackers can use this flaw by suggesting a filename they wish to overwrite on the client machine, and then possibly execute arbitrary code (for instance if the attacker elects to write a dotfile in a home directory).

                                        
                                            #%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-2085. The text 
# itself is copyright (C) Software in the Public Interest, Inc.
#

include("compat.inc");

if (description)
{
  script_id(48247);
  script_version("1.8");
  script_cvs_date("Date: 2019/08/02 13:32:22");

  script_cve_id("CVE-2010-2251");
  script_bugtraq_id(43728);
  script_xref(name:"DSA", value:"2085");

  script_name(english:"Debian DSA-2085-1 : lftp - missing input validation");
  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:
"It was discovered that in lftp, a command-line HTTP/FTP client, there
is no proper validation of the filename provided by the server through
the Content-Disposition header; attackers can use this flaw by
suggesting a filename they wish to overwrite on the client machine,
and then possibly execute arbitrary code (for instance if the attacker
elects to write a dotfile in a home directory)."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.debian.org/security/2010/dsa-2085"
  );
  script_set_attribute(
    attribute:"solution", 
    value:
"Upgrade the lftp packages.

For the stable distribution (lenny), this problem has been fixed in
version 3.7.3-1+lenny1."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:ND/RL:OF/RC:C");
  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:lftp");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:5.0");

  script_set_attribute(attribute:"patch_publication_date", value:"2010/08/03");
  script_set_attribute(attribute:"plugin_publication_date", value:"2010/08/05");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2010-2019 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:"5.0", prefix:"lftp", reference:"3.7.3-1+lenny1")) 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");