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nessusUbuntu Security Notice (C) 2005-2019 Canonical, Inc. / NASL script (C) 2006-2016 Tenable Network Security, Inc.UBUNTU_USN-116-1.NASL
HistoryJan 15, 2006 - 12:00 a.m.

Ubuntu 4.10 / 5.04 : gzip vulnerabilities (USN-116-1)

2006-01-1500:00:00
Ubuntu Security Notice (C) 2005-2019 Canonical, Inc. / NASL script (C) 2006-2016 Tenable Network Security, Inc.
www.tenable.com
16

CVSS2

5

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

PARTIAL

Availability Impact

NONE

AV:N/AC:L/Au:N/C:N/I:P/A:N

EPSS

0.008

Percentile

81.7%

Imran Ghory discovered a race condition in the file permission restore code of gzip and gunzip. While a user was compressing or decompressing a file, a local attacker with write permissions in the directory of that file could replace the target file with a hard link. This would cause gzip to restore the file permissions to the hard link target instead of to the gzip output file, which could be exploited to gain read or even write access to files of other users. (CAN-2005-0988)

Ulf Harnhammar found a path traversal vulnerability when gunzip was used with the -N option. An attacker could exploit this to create files in an arbitrary directory with the permissions of a user if he tricked this user to decompress a specially crafted gzip file using the -N option (which can also happen in systems that automatically process uploaded gzip files). (CAN-2005-1228).

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

#%NASL_MIN_LEVEL 70300

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-116-1. The text 
# itself is copyright (C) Canonical, Inc. See 
# <http://www.ubuntu.com/usn/>. Ubuntu(R) is a registered 
# trademark of Canonical, Inc.
#

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

if (description)
{
  script_id(20504);
  script_version("1.15");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/19");

  script_cve_id("CVE-2005-0988", "CVE-2005-1228");
  script_xref(name:"USN", value:"116-1");

  script_name(english:"Ubuntu 4.10 / 5.04 : gzip vulnerabilities (USN-116-1)");
  script_summary(english:"Checks dpkg output for updated package.");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote Ubuntu host is missing a security-related patch."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"Imran Ghory discovered a race condition in the file permission restore
code of gzip and gunzip. While a user was compressing or decompressing
a file, a local attacker with write permissions in the directory of
that file could replace the target file with a hard link. This would
cause gzip to restore the file permissions to the hard link target
instead of to the gzip output file, which could be exploited to gain
read or even write access to files of other users. (CAN-2005-0988)

Ulf Harnhammar found a path traversal vulnerability when gunzip was
used with the -N option. An attacker could exploit this to create
files in an arbitrary directory with the permissions of a user if he
tricked this user to decompress a specially crafted gzip file using
the -N option (which can also happen in systems that automatically
process uploaded gzip files). (CAN-2005-1228).

Note that Tenable Network Security has extracted the preceding
description block directly from the Ubuntu security advisory. Tenable
has attempted to automatically clean and format it as much as possible
without introducing additional issues."
  );
  script_set_attribute(attribute:"solution", value:"Update the affected gzip package.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:N");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:gzip");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:4.10");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:5.04");

  script_set_attribute(attribute:"patch_publication_date", value:"2005/05/04");
  script_set_attribute(attribute:"plugin_publication_date", value:"2006/01/15");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"Ubuntu Security Notice (C) 2005-2019 Canonical, Inc. / NASL script (C) 2006-2016 Tenable Network Security, Inc.");
  script_family(english:"Ubuntu Local Security Checks");

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

  exit(0);
}


include("audit.inc");
include("ubuntu.inc");
include("misc_func.inc");

if ( ! get_kb_item("Host/local_checks_enabled") ) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item("Host/Ubuntu/release");
if ( isnull(release) ) audit(AUDIT_OS_NOT, "Ubuntu");
release = chomp(release);
if (! ereg(pattern:"^(4\.10|5\.04)$", string:release)) audit(AUDIT_OS_NOT, "Ubuntu 4.10 / 5.04", "Ubuntu " + release);
if ( ! get_kb_item("Host/Debian/dpkg-l") ) audit(AUDIT_PACKAGE_LIST_MISSING);

cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Ubuntu", cpu);

flag = 0;

if (ubuntu_check(osver:"4.10", pkgname:"gzip", pkgver:"1.3.5-9ubuntu3.1")) flag++;
if (ubuntu_check(osver:"5.04", pkgname:"gzip", pkgver:"1.3.5-9ubuntu3.1")) flag++;

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    extra      : ubuntu_report_get()
  );
  exit(0);
}
else
{
  tested = ubuntu_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "gzip");
}

CVSS2

5

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

PARTIAL

Availability Impact

NONE

AV:N/AC:L/Au:N/C:N/I:P/A:N

EPSS

0.008

Percentile

81.7%