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[Debian] Zwei Schwachstellen in OpenSSH - DSA-1212-1



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Liebe Kolleginnen und Kollegen,

soeben erreichte uns nachfolgende Warnung des Debian-Teams. Wir geben
diese Informationen unveraendert an Sie weiter.

CVE-2006-4924 - Denial of Service Schwachstelle in der OpenSSH

  Es besteht ein Fehler im Programmcode der OpenSSH, der einen Angriff
  gegen einen alten Fehler in der Implementierung des SSH1 Protokoll
  erkennen soll (CRC Compensation Attack). Schickt ein Angreifer eine
  entsprechend manipulierte Anfrage an den SSH Daemon, verbraucht dieser
  sehr viel Rechenzeit (Denial of Service).

  Der Angriff kann ohne vorherige Authentifikation durchgefuehrt werden
  und Programme zur Ausnutzung der Schwachstelle bereits oeffentlich
  verfuegbar.

CVE-2006-5051 - Race Condition im OpenSSH Signal Handler

  Es existiert eine Race Condition bei der Bearbeitung von Signalen in
  der OpenSSH. Ein entfernter Angreifer kann den SSH Daemon dadurch zum
  Absturz bringen und evtl. ist es auch moeglich beliebige Befehle mit
  den Rechten des Daemon auszufuehren. Fuer einen erfolgreichen Angriff
  muss die Authentifikation ueber die GSSAPI aktiviert sein.

Betroffen sind die folgenden Software Pakete und Plattformen:

  Paket openssh in der stable Distribution (sarge) vor Version
  1:3.8.1p1-8.sarge.6
  Paket openssh in der unstable und testing Distribution vor Version
  1:4.3p2-4

  Stable Distribution (sarge)
  Unstable und testing Distribution

Vom Hersteller werden ueberarbeitete Pakete zur Verfuegung gestellt.

Hersteller Advisory:
  http://www.debian.org/security/2006/dsa-1212


(c) der deutschen Zusammenfassung bei DFN-CERT Services GmbH; die
Verbreitung, auch auszugsweise, ist nur unter Hinweis auf den Urheber,
DFN-CERT Services GmbH, und nur zu nicht kommerziellen Zwecken
gestattet.

Mit freundlichen Gruessen,
Jan Kohlrausch (CSIRT), DFN-CERT Services GmbH
Web: https://www.dfn-cert.de/, Phone: +49-40-808077-555
PGP RSA/2048, A5DD03D1, A2 55 1C 51 0A 30 3E 78  5B 40 DA B7 14 F7 C9 E8


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Hash: SHA1

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Debian Security Advisory DSA-1212-1                security@xxxxxxxxxx
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@xxxxxxxxxxxxxxxx
Package info: `apt-cache show <pkg>' and http://packages.debian.org/<pkg>
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