[Debian] Schwachstelle in Bibliothek libtasn1-2 - DSA 985-1

win-sec-ssc at dfn-cert.de win-sec-ssc at dfn-cert.de
Mon Mar 6 14:46:14 CET 2006


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Liebe Kolleginnen und Kollegen,

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

Die Abstract Syntax Notation (ASN.1) wird zur Spezifikation von
Datentypen verwendet. Die Distinguished Encoding Rules (DER) sind ein
Regelsatz zur Kodierung von Daten innerhalb der ASN.1, angepasst an
Krypto-Anwendungen.

CAN-2006-0645 - Schwachstellen bei der Dekodierung von ASN.1 DER-Daten

  In der Bibliothek libtasn1 exisistieren mehrere Schwachstellen bei der
  Dekodierung von DER-kodierten Daten. Ein entfernter Angreifer kann
  diese Schwachstelle durch entsprechend konstruierte DER-kodierte Daten
  ausnutzen, um die Anwendung abstuerzen zu lassen, die die verwundbare
  Bibliothek verwendet (Denial of Service). Zur Zeit ist noch unklar, ob
  diese Schwachstelle vom Angreifer ausgenutzt werden kann, um
  beliebigebn Code auszufuehren.

Betroffen sind die folgenden Software Pakete und Plattformen:

  Paket libtasn1-2 in der stable Distribution (sarge) vor Version
  2_0.2.10-3sarge1
  Paket libtasn1-2 in der unstable Distribution (sid) (Patches sind
  angekuendigt)

  Stable Distribution (sarge)
  Testing Distribution (sid)

Vom Hersteller werden ueberarbeitete Pakete zur Verfuegung gestellt.

Hersteller Advisory:
  http://www.debian.org/security/2006/dsa-985


(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

- -- 
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
13.DFN-CERT Workshop "Sicherheit in vernetzten Systemen", 1./2.3.2006

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Debian Security Advisory DSA 985-1                     security at debian.org
http://www.debian.org/security/                             Martin Schulze
March 6th, 2006                         http://www.debian.org/security/faq
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Package        : libtasn1-2
Vulnerability  : buffer overflows
Problem type   : remote
Debian-specific: no
CVE ID         : CVE-2006-0645
Bugtraq ID     : 16568

Evgeny Legerov discovered several out-of-bounds memory accesses in the
DER decoding component component of the Tiny ASN.1 Library that allows
attackers to crash the DER decoder and possibly execute arbitrary code.

The old stable distribution (woody) is not affected by these problems.

For the stable distribution (sarge) these problems have been fixed in
version 2_0.2.10-3sarge1.

For the unstable distribution (sid) these problems will be fixed soon.

We recommend that you upgrade your gnutls packages.


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 3.1 alias sarge
- - --------------------------------

  Source archives:

    http://security.debian.org/pool/updates/main/libt/libtasn1-2/libtasn1-2_0.2.10-3sarge1.dsc
      Size/MD5 checksum:      670 8666643f13c1feb86814483c36dcb86a
    http://security.debian.org/pool/updates/main/libt/libtasn1-2/libtasn1-2_0.2.10-3sarge1.diff.gz
      Size/MD5 checksum:   292137 8c9367bd26e7e6b33feb560212229ae8
    http://security.debian.org/pool/updates/main/libt/libtasn1-2/libtasn1-2_0.2.10.orig.tar.gz
      Size/MD5 checksum:   113412 ae95aa75e5db7dc4d85b2837017364a6

  Alpha architecture:

    http://security.debian.org/pool/updates/main/libt/libtasn1-2/libtasn1-2_0.2.10-3sarge1_alpha.deb
      Size/MD5 checksum:    49644 4ef2707cde095b82c58b00bae5ec01cd
    http://security.debian.org/pool/updates/main/libt/libtasn1-2/libtasn1-2-dev_0.2.10-3sarge1_alpha.deb
      Size/MD5 checksum:   198922 1f8a6071d61e39d69b0ca0c143d83165

  AMD64 architecture:

    http://security.debian.org/pool/updates/main/libt/libtasn1-2/libtasn1-2_0.2.10-3sarge1_amd64.deb
      Size/MD5 checksum:    44460 804a5db0d0ccfd0c45ee1daf66fb8d2b
    http://security.debian.org/pool/updates/main/libt/libtasn1-2/libtasn1-2-dev_0.2.10-3sarge1_amd64.deb
      Size/MD5 checksum:   185776 88ba0556bfbe66bb9857d8d990a16973

  ARM architecture:

    http://security.debian.org/pool/updates/main/libt/libtasn1-2/libtasn1-2_0.2.10-3sarge1_arm.deb
      Size/MD5 checksum:    40998 80441d397c5610068d763528d1fa0b85
    http://security.debian.org/pool/updates/main/libt/libtasn1-2/libtasn1-2-dev_0.2.10-3sarge1_arm.deb
      Size/MD5 checksum:   186062 8c061b9a10eb79e975e6ba86652c47fb

  Intel IA-32 architecture:

    http://security.debian.org/pool/updates/main/libt/libtasn1-2/libtasn1-2_0.2.10-3sarge1_i386.deb
      Size/MD5 checksum:    43460 5948585c89f733b64223d5cda0e9b0b3
    http://security.debian.org/pool/updates/main/libt/libtasn1-2/libtasn1-2-dev_0.2.10-3sarge1_i386.deb
      Size/MD5 checksum:   182750 0070e40570d4b57dcbd696a8bca3ef32

  Intel IA-64 architecture:

    http://security.debian.org/pool/updates/main/libt/libtasn1-2/libtasn1-2_0.2.10-3sarge1_ia64.deb
      Size/MD5 checksum:    59434 c354bb099c7a7ff0b83b4ce4b201f134
    http://security.debian.org/pool/updates/main/libt/libtasn1-2/libtasn1-2-dev_0.2.10-3sarge1_ia64.deb
      Size/MD5 checksum:   200622 360eef8f745b5e20dced7eb2f9b7b283

  HP Precision architecture:

    http://security.debian.org/pool/updates/main/libt/libtasn1-2/libtasn1-2_0.2.10-3sarge1_hppa.deb
      Size/MD5 checksum:    47664 0ef077cc156e5590e44a26ec85c99a49
    http://security.debian.org/pool/updates/main/libt/libtasn1-2/libtasn1-2-dev_0.2.10-3sarge1_hppa.deb
      Size/MD5 checksum:   187158 4f446f584c50416f5a94c2765eca734e

  Motorola 680x0 architecture:

    http://security.debian.org/pool/updates/main/libt/libtasn1-2/libtasn1-2_0.2.10-3sarge1_m68k.deb
      Size/MD5 checksum:    39532 9c954f1aa9cc9ca6be038cba975547f6
    http://security.debian.org/pool/updates/main/libt/libtasn1-2/libtasn1-2-dev_0.2.10-3sarge1_m68k.deb
      Size/MD5 checksum:   178254 d2654672c4e00ff79f300240c0863511

  Big endian MIPS architecture:

    http://security.debian.org/pool/updates/main/libt/libtasn1-2/libtasn1-2_0.2.10-3sarge1_mips.deb
      Size/MD5 checksum:    47068 a62291b5f623efeb663ba8d74768184f
    http://security.debian.org/pool/updates/main/libt/libtasn1-2/libtasn1-2-dev_0.2.10-3sarge1_mips.deb
      Size/MD5 checksum:   187780 7d619e82628bd9a0511eb604e258a7cc

  Little endian MIPS architecture:

    http://security.debian.org/pool/updates/main/libt/libtasn1-2/libtasn1-2_0.2.10-3sarge1_mipsel.deb
      Size/MD5 checksum:    47106 66f753671aa3f743d3b28a53ac9c65b7
    http://security.debian.org/pool/updates/main/libt/libtasn1-2/libtasn1-2-dev_0.2.10-3sarge1_mipsel.deb
      Size/MD5 checksum:   187744 8abeac81b2d6101e8ec322ef43a7a42a

  PowerPC architecture:

    http://security.debian.org/pool/updates/main/libt/libtasn1-2/libtasn1-2_0.2.10-3sarge1_powerpc.deb
      Size/MD5 checksum:    43042 9cb6b6c8282f2b5771cd6bdceab35767
    http://security.debian.org/pool/updates/main/libt/libtasn1-2/libtasn1-2-dev_0.2.10-3sarge1_powerpc.deb
      Size/MD5 checksum:   187828 54b7db1b1c0f64f846229d58855b723b

  IBM S/390 architecture:

    http://security.debian.org/pool/updates/main/libt/libtasn1-2/libtasn1-2_0.2.10-3sarge1_s390.deb
      Size/MD5 checksum:    45394 918971380ceb9ff90d76b9961cc8498f
    http://security.debian.org/pool/updates/main/libt/libtasn1-2/libtasn1-2-dev_0.2.10-3sarge1_s390.deb
      Size/MD5 checksum:   185462 2e79e42a24786d899a7500d1626fe164

  Sun Sparc architecture:

    http://security.debian.org/pool/updates/main/libt/libtasn1-2/libtasn1-2_0.2.10-3sarge1_sparc.deb
      Size/MD5 checksum:    41776 73e43f3d0917933529c3688b67b08957
    http://security.debian.org/pool/updates/main/libt/libtasn1-2/libtasn1-2-dev_0.2.10-3sarge1_sparc.deb
      Size/MD5 checksum:   183816 bef29056f86d10dac454d0bedd6f52cb


  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 at lists.debian.org
Package info: `apt-cache show <pkg>' and http://packages.debian.org/<pkg>

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