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UNIRAS Brief - 516/05 - Debian - Three Security Advisories



 
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   UNIRAS (UK Govt CERT) Briefing Notice - 516/05 dated 08.07.05  Time: 14:30  
  UNIRAS is part of NISCC (National Infrastructure Security Co-ordination Centre)
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  UNIRAS material is also available from its website at www.uniras.gov.uk and
         Information about NISCC is available from www.niscc.gov.uk
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Title
=====
Debian - Three Security Advisories:
     1.  New sudo packages fix pathname validation race [DSA 735-2]
     2.  New spamassassin packages fix potential DOS    [DSA 736-2]
     3.  New cvs packages fix arbitrary code execution  [DSA 742-1]

Detail
====== 

Security advisory summaries:

     1.  A local user who has been granted permission to run commands via sudo
         could run arbitrary commands as a privileged user due to a flaw in
         sudo's pathname validation.

     2.  A vulnerability was recently found in the way that SpamAssassin parses
         certain email headers. This vulnerability could cause SpamAssassin to
         consume a large number of CPU cycles when processing messages containing
         these headers, leading to a potential denial of service (DOS) attack. 

     3.  Derek Price, the current maintainer of CVS, discovered a buffer
         overflow in the CVS server, that serves the popular Concurrent
         Versions System, which could lead to the execution of arbitrary code.

Security advisory content follows:


1.


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Debian Security Advisory DSA 735-2                   security@xxxxxxxxxx
http://www.debian.org/security/                            Michael Stone
July 07, 2005                         http://www.debian.org/security/faq
- - ------------------------------------------------------------------------

Package        : sudo
Vulnerability  : pathname validation race
Problem type   : local
Debian-specific: no
CVE Id(s)      : CAN-2005-1993
Debian Bug     : 315115

A local user who has been granted permission to run commands via sudo
could run arbitrary commands as a privileged user due to a flaw in
sudo's pathname validation. This bug only affects configurations which
have restricted user configurations prior to an ALL directive in the
configuration file. A workaround is to move any ALL directives to the
beginning of the sudoers file; see the advisory at
http://www.sudo.ws/sudo/alerts/path_race.html for more information.

For the old stable Debian distribution (woody), this problem has been
fixed in version 1.6.6-1.3woody1.

For the current stable distribution (sarge), this problem has been fixed
in version 1.6.8p7-1.1sarge1.

For the unstable distribution, this problem has been fixed in version
1.6.8p9-1.

The only change since DSA 735-1 is the addition of certain architectures
which were not available in the original advisory.

We recommend that you upgrade your sudo package.

Upgrade instructions
- - --------------------

wget url
        will fetch the file for you
dpkg -i file.deb
        will install the referenced file.

If you are using the apt-get package manager, use the line for
sources.list as given below:

apt-get update
        will update the internal database
apt-get upgrade
        will install corrected packages

You may use an automated update by adding the resources from the
footer to the proper configuration.


Debian 3.0 (woody)
- - ------------------

  woody was released for alpha, arm, hppa, i386, ia64, m68k, mips,
  mipsel, powerpc, s390 and sparc. Packages for all but arm & ia64 were
  released in DSA 735-1.

  arm architecture (ARM)

    http://security.debian.org/pool/updates/main/s/sudo/sudo_1.6.6-1.3woody1_arm.deb
      Size/MD5 checksum:   140196 68a776aa70997915c4cd3b2513cfda9a

  ia64 architecture (Intel ia64)

    http://security.debian.org/pool/updates/main/s/sudo/sudo_1.6.6-1.3woody1_ia64.deb
      Size/MD5 checksum:   170186 a7f5941729ed3e865b3809225de8c950


Debian 3.1 (sarge)
- - ------------------

  sarge was released for alpha, arm, hppa, i386, ia64, m68k, mips,
  mipsel, powerpc, s390 and sparc. Packages for all but arm were
  released in DSA 735-1.

  arm architecture (ARM)

    http://security.debian.org/pool/updates/main/s/sudo/sudo_1.6.8p7-1.1sarge1_arm.deb
      Size/MD5 checksum:   163476 870b7104140d4170b2bbc663d431c333


- - -------------------------------------------------------------------------------
For apt-get: deb http://security.debian.org/ stable/updates main
For dpkg-ftp: ftp://security.debian.org/debian-security dists/stable/updates/main
Mailing list: debian-security-announce@xxxxxxxxxxxxxxxx
Package info: `apt-cache show <pkg>' and http://packages.debian.org/<pkg>

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2.



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Debian Security Advisory DSA 736-2                   security@xxxxxxxxxx
http://www.debian.org/security/                            Michael Stone
July 07, 2005                         http://www.debian.org/security/faq
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Package        : spamassassin
Vulnerability  : mail header parsing error
Problem type   : remote DOS
Debian-specific: no
CVE Id(s)      : CAN-2005-1266
Debian Bug     : 314447

A vulnerability was recently found in the way that SpamAssassin parses
certain email headers. This vulnerability could cause SpamAssassin to
consume a large number of CPU cycles when processing messages containing
these headers, leading to a potential denial of service (DOS) attack. 

The version of SpamAssassin in the old stable distribution (woody) is
not vulnerable.

For the stable distribution (sarge), this problem has been fixed in
version 3.0.3-2. Note that packages are not yet ready for certain
architectures; these will be released as they become available.

For the unstable distribution (sid), this problem has been fixed in
version 3.0.4-1.

The only change since DSA 736-1 is the addition of packages for certain
architectures that were not available at the time of the original
advisory.

We recommend that you upgrade your sarge or sid spamassassin package.

Upgrade instructions
- - --------------------

wget url
        will fetch the file for you
dpkg -i file.deb
        will install the referenced file.

If you are using the apt-get package manager, use the line for
sources.list as given below:

apt-get update
        will update the internal database
apt-get upgrade
        will install corrected packages

You may use an automated update by adding the resources from the
footer to the proper configuration.


Debian 3.1 (sarge)
- - ------------------

  sarge was released for alpha, arm, hppa, i386, ia64, m68k, mips, mipsel, powerpc, s390 
  and sparc. Packages were released for all but arm and hppa in DSA 736-1.

  arm architecture (ARM)

    http://security.debian.org/pool/updates/main/s/spamassassin/spamc_3.0.3-2_arm.deb
      Size/MD5 checksum:    58362 cf463ef4d601f3f6502f891eef928451

  hppa architecture (HP PA RISC)

    http://security.debian.org/pool/updates/main/s/spamassassin/spamc_3.0.3-2_hppa.deb
      Size/MD5 checksum:    60236 4f6c26a0c8ac1249aa38c17040b18d97


- - -------------------------------------------------------------------------------
For apt-get: deb http://security.debian.org/ stable/updates main
For dpkg-ftp: ftp://security.debian.org/debian-security dists/stable/updates/main
Mailing list: debian-security-announce@xxxxxxxxxxxxxxxx
Package info: `apt-cache show <pkg>' and http://packages.debian.org/<pkg>
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3.



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Debian Security Advisory DSA 742-1                     security@xxxxxxxxxx
http://www.debian.org/security/                             Martin Schulze
July 7th, 2005                          http://www.debian.org/security/faq
- - --------------------------------------------------------------------------

Package        : cvs
Vulnerability  : buffer overflow
Problem-Type   : remote
Debian-specific: no
CVE ID         : CAN-2005-0753
Debian Bug     : 305254

Derek Price, the current maintainer of CVS, discovered a buffer
overflow in the CVS server, that serves the popular Concurrent
Versions System, which could lead to the execution of arbitrary code.

For the old stable distribution (woody) this problem has been fixed in
version 1.11.1p1debian-12.

For the stable distribution (sarge) this problem has been fixed in
version 1.12.9-13.

For the unstable distribution (sid) this problem has been fixed in
version 1.12.9-13.

We recommend that you upgrade your cvs package.


Upgrade Instructions
- - --------------------

wget url
        will fetch the file for you
dpkg -i file.deb
        will install the referenced file.

If you are using the apt-get package manager, use the line for
sources.list as given below:

apt-get update
        will update the internal database
apt-get upgrade
        will install corrected packages

You may use an automated update by adding the resources from the
footer to the proper configuration.


Debian GNU/Linux 3.0 alias woody
- - --------------------------------

  Source archives:

    http://security.debian.org/pool/updates/main/c/cvs/cvs_1.11.1p1debian-12.dsc
      Size/MD5 checksum:      683 5e63610a590a16f61203fab6a71ccf22
    http://security.debian.org/pool/updates/main/c/cvs/cvs_1.11.1p1debian-12.diff.gz
      Size/MD5 checksum:    57006 a143203742f3f812d951effcf4c37d0d
    http://security.debian.org/pool/updates/main/c/cvs/cvs_1.11.1p1debian.orig.tar.gz
      Size/MD5 checksum:  2621658 500965ab9702b31605f8c58aa21a6205

  Alpha architecture:

    http://security.debian.org/pool/updates/main/c/cvs/cvs_1.11.1p1debian-12_alpha.deb
      Size/MD5 checksum:  1179278 1d956eaf1ba6f00e3dad6b264f261e17

  ARM architecture:

    http://security.debian.org/pool/updates/main/c/cvs/cvs_1.11.1p1debian-12_arm.deb
      Size/MD5 checksum:  1106264 1d8bc9b6632276c20e1a6f20be73b0ea

  Intel IA-32 architecture:

    http://security.debian.org/pool/updates/main/c/cvs/cvs_1.11.1p1debian-12_i386.deb
      Size/MD5 checksum:  1085358 44faa4536ff37f3f538345c0d28ee600

  Intel IA-64 architecture:

    http://security.debian.org/pool/updates/main/c/cvs/cvs_1.11.1p1debian-12_ia64.deb
      Size/MD5 checksum:  1272628 e4b3f0e7793ff732b5b353d0a50235bc

  HP Precision architecture:

    http://security.debian.org/pool/updates/main/c/cvs/cvs_1.11.1p1debian-12_hppa.deb
      Size/MD5 checksum:  1148446 9cf071f9416238f4fd2c0a4b84dc43ca

  Motorola 680x0 architecture:

    http://security.debian.org/pool/updates/main/c/cvs/cvs_1.11.1p1debian-12_m68k.deb
      Size/MD5 checksum:  1066724 236acfc29d020dd1c367ae8b92454aaa

  Big endian MIPS architecture:

    http://security.debian.org/pool/updates/main/c/cvs/cvs_1.11.1p1debian-12_mips.deb
      Size/MD5 checksum:  1130848 3bb9103c835160bd5ee670ae9b45c573

  Little endian MIPS architecture:

    http://security.debian.org/pool/updates/main/c/cvs/cvs_1.11.1p1debian-12_mipsel.deb
      Size/MD5 checksum:  1132246 f5e0ed9bdd8d4d8696b3477bbe576312

  PowerPC architecture:

    http://security.debian.org/pool/updates/main/c/cvs/cvs_1.11.1p1debian-12_powerpc.deb
      Size/MD5 checksum:  1117304 6cdfca6759d182b5002e24d2e7c38161

  IBM S/390 architecture:

    http://security.debian.org/pool/updates/main/c/cvs/cvs_1.11.1p1debian-12_s390.deb
      Size/MD5 checksum:  1098040 5a2a3ab9ad5ffd10875f82deea885dce

  Sun Sparc architecture:

    http://security.debian.org/pool/updates/main/c/cvs/cvs_1.11.1p1debian-12_sparc.deb
      Size/MD5 checksum:  1107716 3a334f9f68ec12f781b687affc4285eb


  These files will probably be moved into the stable distribution on
  its next update.

- - ---------------------------------------------------------------------------------
For apt-get: deb http://security.debian.org/ stable/updates main
For dpkg-ftp: ftp://security.debian.org/debian-security dists/stable/updates/main
Mailing list: debian-security-announce@xxxxxxxxxxxxxxxx
Package info: `apt-cache show <pkg>' and http://packages.debian.org/<pkg>

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UNIRAS wishes to acknowledge the contributions of Debian for the information 
contained in this Briefing. 
- ----------------------------------------------------------------------------------
This Briefing contains the information released by the original author. Some 
of the information may have changed since it was released. If the vulnerability 
affects you, it may be prudent to retrieve the advisory from the canonical site 
to ensure that you receive the most current information concerning that problem.

Reference to any specific commercial product, process, or service by trade 
name, trademark manufacturer, or otherwise, does not constitute or imply 
its endorsement, recommendation, or favouring by UNIRAS or NISCC.  The views 
and opinions of authors expressed within this notice shall not be used for 
advertising or product endorsement purposes.

Neither UNIRAS or NISCC shall also accept responsibility for any errors 
or omissions contained within this briefing notice. In particular, they shall 
not be liable for any loss or damage whatsoever, arising from or in connection 
with the usage of information contained within this notice.

UNIRAS is a member of the Forum of Incident Response and Security Teams (FIRST) 
and has contacts with other international Incident Response Teams (IRTs) in 
order to foster cooperation and coordination in incident prevention, to prompt 
rapid reaction to incidents, and to promote information sharing amongst its 
members and the community at large. 
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<End of UNIRAS Briefing>

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