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nessusUbuntu Security Notice (C) 2005-2019 Canonical, Inc. / NASL script (C) 2006-2016 Tenable Network Security, Inc.UBUNTU_USN-127-1.NASL
HistoryJan 15, 2006 - 12:00 a.m.

Ubuntu 4.10 / 5.04 : bzip2 vulnerabilities (USN-127-1)

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
13

CVSS2

5

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

PARTIAL

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

EPSS

0.013

Percentile

86.1%

Imran Ghory discovered a race condition in the file permission restore code of bunzip2. While a user was 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 bzip2 to restore the file permissions to the hard link target instead of to the bzip2 output file, which could be exploited to gain read or even write access to files of other users. (CAN-2005-0953)

Specially crafted bzip2 archives caused an infinite loop in the decompressor which resulted in an indefinitively large output file (β€˜decompression bomb’). This could be exploited to a Denial of Service attack due to disk space exhaustion on systems which automatically process user-supplied bzip2 compressed files. (CAN-2005-1260).

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-127-1. 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(20517);
  script_version("1.16");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/19");

  script_cve_id("CVE-2005-0953", "CVE-2005-1260");
  script_xref(name:"USN", value:"127-1");

  script_name(english:"Ubuntu 4.10 / 5.04 : bzip2 vulnerabilities (USN-127-1)");
  script_summary(english:"Checks dpkg output for updated packages.");

  script_set_attribute(
    attribute:"synopsis", 
    value:
"The remote Ubuntu host is missing one or more security-related
patches."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"Imran Ghory discovered a race condition in the file permission restore
code of bunzip2. While a user was 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 bzip2 to
restore the file permissions to the hard link target instead of to the
bzip2 output file, which could be exploited to gain read or even write
access to files of other users. (CAN-2005-0953)

Specially crafted bzip2 archives caused an infinite loop in the
decompressor which resulted in an indefinitively large output file
('decompression bomb'). This could be exploited to a Denial of Service
attack due to disk space exhaustion on systems which automatically
process user-supplied bzip2 compressed files. (CAN-2005-1260).

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 bzip2, libbz2-1.0 and / or libbz2-dev packages."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:bzip2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libbz2-1.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libbz2-dev");
  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:"2005/05/17");
  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:"bzip2", pkgver:"1.0.2-1ubuntu0.1")) flag++;
if (ubuntu_check(osver:"4.10", pkgname:"libbz2-1.0", pkgver:"1.0.2-1ubuntu0.1")) flag++;
if (ubuntu_check(osver:"4.10", pkgname:"libbz2-dev", pkgver:"1.0.2-1ubuntu0.1")) flag++;
if (ubuntu_check(osver:"5.04", pkgname:"bzip2", pkgver:"1.0.2-2ubuntu0.1")) flag++;
if (ubuntu_check(osver:"5.04", pkgname:"libbz2-1.0", pkgver:"1.0.2-2ubuntu0.1")) flag++;
if (ubuntu_check(osver:"5.04", pkgname:"libbz2-dev", pkgver:"1.0.2-2ubuntu0.1")) 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, "bzip2 / libbz2-1.0 / libbz2-dev");
}
VendorProductVersionCPE
canonicalubuntu_linuxbzip2p-cpe:/a:canonical:ubuntu_linux:bzip2
canonicalubuntu_linuxlibbz2-1.0p-cpe:/a:canonical:ubuntu_linux:libbz2-1.0
canonicalubuntu_linuxlibbz2-devp-cpe:/a:canonical:ubuntu_linux:libbz2-dev
canonicalubuntu_linux4.10cpe:/o:canonical:ubuntu_linux:4.10
canonicalubuntu_linux5.04cpe:/o:canonical:ubuntu_linux:5.04

CVSS2

5

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

PARTIAL

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

EPSS

0.013

Percentile

86.1%