Articles / Debian: New openssh package…

Debian: New openssh packages fix denial of service

Two denial of service vulnerabilities have been found in the OpenSSH server. The sshd support for ssh protcol version 1 does not properly handle duplicate incoming blocks. This could allow a remote attacker to cause sshd to consume significant CPU resources leading to a denial of service. A signal handler race condition could potentially allow a remote attacker to crash sshd and could theoretically lead to the ability to execute arbitrary code. Fixed packages are available from security.debian.org.
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- ------------------------------------------------------------------------
Debian Security Advisory DSA-1212-1                security@debian.org
http://www.debian.org/security/                         Noah Meyerhans
November 15, 2006
- ------------------------------------------------------------------------

Package        : openssh (1:3.8.1p1-8.sarge.6)
Vulnerability  : Denial of service
Problem type   : remote
Debian-specific: no
CVE Id(s)      : CVE-2006-4924 CVE-2006-5051
BugTraq ID     : 20216 20241
Debian Bug     : 392428

Two denial of service vulnerabilities have been found in the OpenSSH
server.

CVE-2006-4924
	The sshd support for ssh protcol version 1 does not properly
	handle duplicate incoming blocks.  This could allow a remote
	attacker to cause sshd to consume significant CPU resources
	leading to a denial of service.

CVE-2006-5051
	A signal handler race condition could potentially allow a remote
	attacker to crash sshd and could theoretically lead to the
	ability to execute arbitrary code.

For the stable distribution (sarge), these problems have been fixed in
version 1:3.8.1p1-8.sarge.6

For the unstable and testing distributions, these problems have been
fixed in version 1:4.3p2-4

We recommend that you upgrade your openssh 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 (stable)
- -------------------

Stable updates are available for alpha, amd64, arm, hppa, i386, ia64, m68k, mips, mipsel, powerpc, s390 and sparc.

Source archives:

  http://security.debian.org/pool/updates/main/o/openssh/openssh_3.8.1p1-8.sarge.6.dsc
    Size/MD5 checksum:      842 b58f3585c4ce713f58096cc8f86e4550
  http://security.debian.org/pool/updates/main/o/openssh/openssh_3.8.1p1.orig.tar.gz
    Size/MD5 checksum:   795948 9ce6f2fa5b2931ce2c4c25f3af9ad50d
  http://security.debian.org/pool/updates/main/o/openssh/openssh_3.8.1p1-8.sarge.6.diff.gz
    Size/MD5 checksum:   157942 413fea91d9074513db60e466ca053f0d

alpha architecture (DEC Alpha)

  http://security.debian.org/pool/updates/main/o/openssh/openssh-server-udeb_3.8.1p1-8.sarge.6_alpha.udeb
    Size/MD5 checksum:   216100 0595066001c0004f181b58e781153ae2
  http://security.debian.org/pool/updates/main/o/openssh/ssh-askpass-gnome_3.8.1p1-8.sarge.6_alpha.deb
    Size/MD5 checksum:    52112 dcca41fba77489a57bf5a7e9c9069e90
  http://security.debian.org/pool/updates/main/o/openssh/ssh_3.8.1p1-8.sarge.6_alpha.deb
    Size/MD5 checksum:   886462 71f73c733794ea68f8c8c6e05ca2e8d3
  http://security.debian.org/pool/updates/main/o/openssh/openssh-client-udeb_3.8.1p1-8.sarge.6_alpha.udeb
    Size/MD5 checksum:   195114 32b3d7e2b11a5ae016ea19d44380f0d1

amd64 architecture (AMD x86_64 (AMD64))

  http://security.debian.org/pool/updates/main/o/openssh/openssh-client-udeb_3.8.1p1-8.sarge.6_amd64.udeb
    Size/MD5 checksum:   159608 2d8c050003def7b7a2c8832333f90cf0
  http://security.debian.org/pool/updates/main/o/openssh/ssh-askpass-gnome_3.8.1p1-8.sarge.6_amd64.deb
    Size/MD5 checksum:    51688 ca60feebdef5f772ab0d42b6fd2c61f0
  http://security.debian.org/pool/updates/main/o/openssh/ssh_3.8.1p1-8.sarge.6_amd64.deb
    Size/MD5 checksum:   748382 59cebd0c9413b12894b88f9688216847
  http://security.debian.org/pool/updates/main/o/openssh/openssh-server-udeb_3.8.1p1-8.sarge.6_amd64.udeb
    Size/MD5 checksum:   176252 d886a611e7b150786b6e3ccdac303018

arm architecture (ARM)

  http://security.debian.org/pool/updates/main/o/openssh/ssh_3.8.1p1-8.sarge.6_arm.deb
    Size/MD5 checksum:   673038 a58f22f69602835be4ebe87493d6f006
  http://security.debian.org/pool/updates/main/o/openssh/openssh-server-udeb_3.8.1p1-8.sarge.6_arm.udeb
    Size/MD5 checksum:   153938 5c668e80ea8429d686f9f9999b1e450d
  http://security.debian.org/pool/updates/main/o/openssh/ssh-askpass-gnome_3.8.1p1-8.sarge.6_arm.deb
    Size/MD5 checksum:    51028 3fc55eba3c4ec515fb70220b5f64a8d3
  http://security.debian.org/pool/updates/main/o/openssh/openssh-client-udeb_3.8.1p1-8.sarge.6_arm.udeb
    Size/MD5 checksum:   144324 f8ca3e9ae3592445e1b18cc84f111f30

hppa architecture (HP PA RISC)

  http://security.debian.org/pool/updates/main/o/openssh/openssh-client-udeb_3.8.1p1-8.sarge.6_hppa.udeb
    Size/MD5 checksum:   166640 ef7a980dfd7fbb3319d7be72a34783cd
  http://security.debian.org/pool/updates/main/o/openssh/ssh-askpass-gnome_3.8.1p1-8.sarge.6_hppa.deb
    Size/MD5 checksum:    51764 5e5dfa87acf51e46224f54b3caf39814
  http://security.debian.org/pool/updates/main/o/openssh/openssh-server-udeb_3.8.1p1-8.sarge.6_hppa.udeb
    Size/MD5 checksum:   176152 480fd653a01de9ec47801b20e28c180a
  http://security.debian.org/pool/updates/main/o/openssh/ssh_3.8.1p1-8.sarge.6_hppa.deb
    Size/MD5 checksum:   759876 aaced6680806080745d7e7b1b7e16105

i386 architecture (Intel ia32)

  http://security.debian.org/pool/updates/main/o/openssh/openssh-client-udeb_3.8.1p1-8.sarge.6_i386.udeb
    Size/MD5 checksum:   133076 3e8728a64af00a02dd940350512eb5d9
  http://security.debian.org/pool/updates/main/o/openssh/ssh_3.8.1p1-8.sarge.6_i386.deb
    Size/MD5 checksum:   688728 15e34bcd846e85fac769f3ac3c90e14b
  http://security.debian.org/pool/updates/main/o/openssh/ssh-askpass-gnome_3.8.1p1-8.sarge.6_i386.deb
    Size/MD5 checksum:    51336 b0c953a6b2a8d04fd3a384bd987be243
  http://security.debian.org/pool/updates/main/o/openssh/openssh-server-udeb_3.8.1p1-8.sarge.6_i386.udeb
    Size/MD5 checksum:   146126 d0c4ab7aa9735fa5bd6b5e088cd38fe0

ia64 architecture (Intel ia64)

  http://security.debian.org/pool/updates/main/o/openssh/openssh-server-udeb_3.8.1p1-8.sarge.6_ia64.udeb
    Size/MD5 checksum:   245060 943b8ef2aa2efebadb1382a17ec73385
  http://security.debian.org/pool/updates/main/o/openssh/ssh-askpass-gnome_3.8.1p1-8.sarge.6_ia64.deb
    Size/MD5 checksum:    52794 d5152cba549f21aea88e1e4f7e1156f9
  http://security.debian.org/pool/updates/main/o/openssh/openssh-client-udeb_3.8.1p1-8.sarge.6_ia64.udeb
    Size/MD5 checksum:   223128 c1343bc83aa62b8d4d0669990c890e9a
  http://security.debian.org/pool/updates/main/o/openssh/ssh_3.8.1p1-8.sarge.6_ia64.deb
    Size/MD5 checksum:   978348 4df605171fec285cf0d63121dcbdc226

m68k architecture (Motorola Mc680x0)

  http://security.debian.org/pool/updates/main/o/openssh/openssh-server-udeb_3.8.1p1-8.sarge.6_m68k.udeb
    Size/MD5 checksum:   140424 703a06479b9b06d08fdccb08c3c5a0c6
  http://security.debian.org/pool/updates/main/o/openssh/openssh-client-udeb_3.8.1p1-8.sarge.6_m68k.udeb
    Size/MD5 checksum:   126882 d4a4960f8a81e0325e7e51d9de30ccb2
  http://security.debian.org/pool/updates/main/o/openssh/ssh_3.8.1p1-8.sarge.6_m68k.deb
    Size/MD5 checksum:   634538 db5bd8d18c409fdd0d32645229cf2b9c
  http://security.debian.org/pool/updates/main/o/openssh/ssh-askpass-gnome_3.8.1p1-8.sarge.6_m68k.deb
    Size/MD5 checksum:    51254 8b350a4b23bfb3791cba5b48fe5ecd5d

mips architecture (MIPS (Big Endian))

  http://security.debian.org/pool/updates/main/o/openssh/openssh-server-udeb_3.8.1p1-8.sarge.6_mips.udeb
    Size/MD5 checksum:   180468 e5e51b59cb930e454c30464e386354a4
  http://security.debian.org/pool/updates/main/o/openssh/ssh-askpass-gnome_3.8.1p1-8.sarge.6_mips.deb
    Size/MD5 checksum:    51652 dc40a74947d6e20dc1069818b0b509e6
  http://security.debian.org/pool/updates/main/o/openssh/openssh-client-udeb_3.8.1p1-8.sarge.6_mips.udeb
    Size/MD5 checksum:   168434 5c60cab56f8114141c2b66ff11fdb27b
  http://security.debian.org/pool/updates/main/o/openssh/ssh_3.8.1p1-8.sarge.6_mips.deb
    Size/MD5 checksum:   771620 bbfea051bebdda48d80e2e85e54e59fa

mipsel architecture (MIPS (Little Endian))

  http://security.debian.org/pool/updates/main/o/openssh/ssh-askpass-gnome_3.8.1p1-8.sarge.6_mipsel.deb
    Size/MD5 checksum:    51598 f1d94e4df1c066c47b1e8b0da68d1af1
  http://security.debian.org/pool/updates/main/o/openssh/openssh-client-udeb_3.8.1p1-8.sarge.6_mipsel.udeb
    Size/MD5 checksum:   168904 2812bd93c1a73475a2f5da2360c6ae84
  http://security.debian.org/pool/updates/main/o/openssh/openssh-server-udeb_3.8.1p1-8.sarge.6_mipsel.udeb
    Size/MD5 checksum:   180466 34e765b1bb88443887ab351ca1aed6b5
  http://security.debian.org/pool/updates/main/o/openssh/ssh_3.8.1p1-8.sarge.6_mipsel.deb
    Size/MD5 checksum:   773824 b999638c312e9d05bd70550afc44e215

powerpc architecture (PowerPC)

  http://security.debian.org/pool/updates/main/o/openssh/openssh-server-udeb_3.8.1p1-8.sarge.6_powerpc.udeb
    Size/MD5 checksum:   160160 079367a6f51d6b971bb89569098401e3
  http://security.debian.org/pool/updates/main/o/openssh/ssh-askpass-gnome_3.8.1p1-8.sarge.6_powerpc.deb
    Size/MD5 checksum:    52792 232893927edddfe9e90dddf37e746c12
  http://security.debian.org/pool/updates/main/o/openssh/ssh_3.8.1p1-8.sarge.6_powerpc.deb
    Size/MD5 checksum:   738392 1b3480543efd3f9314f7a00279b8b995
  http://security.debian.org/pool/updates/main/o/openssh/openssh-client-udeb_3.8.1p1-8.sarge.6_powerpc.udeb
    Size/MD5 checksum:   151108 6852aaf3e53763b502d7217ad50d44b3

s390 architecture (IBM S/390)

  http://security.debian.org/pool/updates/main/o/openssh/ssh-askpass-gnome_3.8.1p1-8.sarge.6_s390.deb
    Size/MD5 checksum:    51848 477de6fc5a16e8e9c8a6ee37900a0662
  http://security.debian.org/pool/updates/main/o/openssh/openssh-client-udeb_3.8.1p1-8.sarge.6_s390.udeb
    Size/MD5 checksum:   163144 ea1c37908db44852a6a8a3c6e9b46d5e
  http://security.debian.org/pool/updates/main/o/openssh/ssh_3.8.1p1-8.sarge.6_s390.deb
    Size/MD5 checksum:   751564 bce6de0298a3e0e644e7732c1e38b92e
  http://security.debian.org/pool/updates/main/o/openssh/openssh-server-udeb_3.8.1p1-8.sarge.6_s390.udeb
    Size/MD5 checksum:   174552 31116868d2522f627ad4e03e7a5f83ea

sparc architecture (Sun SPARC/UltraSPARC)

  http://security.debian.org/pool/updates/main/o/openssh/ssh_3.8.1p1-8.sarge.6_sparc.deb
    Size/MD5 checksum:   678210 eb8315ac61f84552e5d0960974d8b6b8
  http://security.debian.org/pool/updates/main/o/openssh/openssh-server-udeb_3.8.1p1-8.sarge.6_sparc.udeb
    Size/MD5 checksum:   153190 60ad4beeaa93a360212614fee9059e44
  http://security.debian.org/pool/updates/main/o/openssh/ssh-askpass-gnome_3.8.1p1-8.sarge.6_sparc.deb
    Size/MD5 checksum:    51102 b7e318e55dd39c2c5a7b47cdea057005
  http://security.debian.org/pool/updates/main/o/openssh/openssh-client-udeb_3.8.1p1-8.sarge.6_sparc.udeb
    Size/MD5 checksum:   142084 b84f6dd4d0209df91c1f436e80526aea


  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@lists.debian.org
Package info: `apt-cache show ' and http://packages.debian.org/
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