the original cloud security

FreeBSD Security Advisory - glob(3) Resource Exhaustion

FreeBSD Security Advisory - glob(3) Resource Exhaustion
Posted Feb 19, 2013
Site security.freebsd.org

FreeBSD Security Advisory - The glob(3) function is a pathname generator that implements the rules for file name pattern matching used by the shell. GLOB_LIMIT is supposed to limit the number of paths to prevent against memory or CPU attacks. The implementation however is insufficient. An attacker that is able to exploit this vulnerability could cause excessive memory or CPU usage, resulting in a denial of service.

tags | advisory, denial of service, shell
systems | freebsd
advisories | CVE-2010-2632
MD5 | e65d6e25e32fe6e5deaaabdf8b506705

FreeBSD Security Advisory - glob(3) Resource Exhaustion

Change Mirror Download
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

=============================================================================
FreeBSD-SA-13:02.libc Security Advisory
The FreeBSD Project

Topic: glob(3) related resource exhaustion

Category: core
Module: libc
Announced: 2013-02-19
Affects: All supported versions of FreeBSD.
Corrected: 2013-02-05 09:53:32 UTC (stable/7, 7.4-STABLE)
2013-02-19 13:27:20 UTC (releng/7.4, 7.4-RELEASE-p12)
2013-02-05 09:53:32 UTC (stable/8, 8.3-STABLE)
2013-02-19 13:27:20 UTC (releng/8.3, 8.3-RELEASE-p6)
2013-02-05 09:53:32 UTC (stable/9, 9.1-STABLE)
2013-02-19 13:27:20 UTC (releng/9.0, 9.0-RELEASE-p6)
2013-02-19 13:27:20 UTC (releng/9.1, 9.1-RELEASE-p1)
CVE Name: CVE-2010-2632

For general information regarding FreeBSD Security Advisories,
including descriptions of the fields above, security branches, and the
following sections, please visit <URL:http://security.FreeBSD.org/>.

I. Background

The glob(3) function is a pathname generator that implements the rules for
file name pattern matching used by the shell.

II. Problem Description

GLOB_LIMIT is supposed to limit the number of paths to prevent against
memory or CPU attacks. The implementation however is insufficient.

III. Impact

An attacker that is able to exploit this vulnerability could cause excessive
memory or CPU usage, resulting in a Denial of Service. A common target for
a remote attacker could be ftpd(8).

IV. Workaround

No workaround is available.

V. Solution

Perform one of the following:

1) Upgrade your vulnerable system to a supported FreeBSD stable or
release / security branch (releng) dated after the correction date.

2) To update your vulnerable system via a source code patch:

The following patches have been verified to apply to the applicable
FreeBSD release branches.

a) Download the relevant patch from the location below, and verify the
detached PGP signature using your PGP utility.

# fetch http://security.FreeBSD.org/patches/SA-13:02/libc.patch
# fetch http://security.FreeBSD.org/patches/SA-13:02/libc.patch.asc
# gpg --verify libc.patch.asc

b) Execute the following commands as root:

# cd /usr/src
# patch < /path/to/patch

Recompile the operating system using buildworld and installworld as
described in <URL:http://www.FreeBSD.org/handbook/makeworld.html>.

Restart all daemons, or reboot the system.

3) To update your vulnerable system via a binary patch:

Systems running a RELEASE version of FreeBSD on the i386 or amd64
platforms can be updated via the freebsd-update(8) utility:

# freebsd-update fetch
# freebsd-update install

Restart all daemons, or reboot the system.

VI. Correction details

The following list contains the revision numbers of each file that was
corrected in FreeBSD.

Branch/path Revision
- -------------------------------------------------------------------------
stable/7/ r246357
releng/7.4/ r246989
stable/8/ r246357
releng/8.3/ r246989
stable/9/ r246357
releng/9.0/ r246989
releng/9.1/ r246989
- -------------------------------------------------------------------------

VII. References

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-2632

The latest revision of this advisory is available at
http://security.FreeBSD.org/advisories/FreeBSD-SA-13:02.libc.asc
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.12 (FreeBSD)

iEYEARECAAYFAlEjf80ACgkQFdaIBMps37JFUgCfUrw8Ky4U19COja6fna49Calv
z/YAn1JSGxzHCo8vLj4XhtXqrQt68or4
=mCPv
-----END PGP SIGNATURE-----

Comments

RSS Feed Subscribe to this comment feed

No comments yet, be the first!

Login or Register to post a comment

File Archive:

July 2017

  • Su
  • Mo
  • Tu
  • We
  • Th
  • Fr
  • Sa
  • 1
    Jul 1st
    2 Files
  • 2
    Jul 2nd
    3 Files
  • 3
    Jul 3rd
    15 Files
  • 4
    Jul 4th
    4 Files
  • 5
    Jul 5th
    15 Files
  • 6
    Jul 6th
    15 Files
  • 7
    Jul 7th
    10 Files
  • 8
    Jul 8th
    2 Files
  • 9
    Jul 9th
    10 Files
  • 10
    Jul 10th
    15 Files
  • 11
    Jul 11th
    15 Files
  • 12
    Jul 12th
    19 Files
  • 13
    Jul 13th
    16 Files
  • 14
    Jul 14th
    15 Files
  • 15
    Jul 15th
    3 Files
  • 16
    Jul 16th
    2 Files
  • 17
    Jul 17th
    8 Files
  • 18
    Jul 18th
    11 Files
  • 19
    Jul 19th
    15 Files
  • 20
    Jul 20th
    15 Files
  • 21
    Jul 21st
    15 Files
  • 22
    Jul 22nd
    7 Files
  • 23
    Jul 23rd
    2 Files
  • 24
    Jul 24th
    19 Files
  • 25
    Jul 25th
    28 Files
  • 26
    Jul 26th
    2 Files
  • 27
    Jul 27th
    0 Files
  • 28
    Jul 28th
    0 Files
  • 29
    Jul 29th
    0 Files
  • 30
    Jul 30th
    0 Files
  • 31
    Jul 31st
    0 Files

Top Authors In Last 30 Days

File Tags

Systems

packet storm

© 2016 Packet Storm. All rights reserved.

Services
Security Services
Hosting By
Rokasec
close