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Category:   Application (Generic)  >   Screen Vendors:   GNU [multiple authors]
(Debian Issues Fix) GNU Screen Integer Overflow in 'ansi.c' May Let Local Users Gain Elevated Privileges
SecurityTracker Alert ID:  1008599
SecurityTracker URL:  http://securitytracker.com/id/1008599
CVE Reference:   CAN-2003-0972   (Links to External Site)
Date:  Jan 5 2004
Impact:   Execution of arbitrary code via local system, Root access via local system, User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 4.0.1, 3.9.15, and prior versions
Description:   A vulnerability was reported in GNU Screen. A local user may be able to execute arbitrary code to gain elevated privileges on the target system.

It is reported that a local user can send 2 to 3 gigabytes of data to a target user's screen to trigger a flaw in 'ansi.c'. A large amount of data can reportedly cause the 'w_NumArgs' signed integer to overflow to a negative value, causing a check to ensure that the number of arguments is less than 'MAXARGS' to fail.

The report indicates that screen is typically installed with set user id (setuid) root user privileges of set group id (setgid) utmp group privileges.

The vendor has reportedly been notified.

Impact:   A local user can execute arbitrary code with the privileges of GNU screen (which may be root user privileges or utmp group privileges, depending on the installation).
Solution:   Debian has released a fix for the stable distribution (woody) in version 3.9.11-5woody1 and for the unstable distribution (sid) in version 4.0.2-0.1.

Debian GNU/Linux 3.0 alias woody:

Source archives:

http://security.debian.org/pool/updates/main/s/screen/screen_3.9.11-5woody1.dsc
Size/MD5 checksum: 633 a1e5493005ceaf734b6128766d17a641
http://security.debian.org/pool/updates/main/s/screen/screen_3.9.11-5woody1.diff.gz
Size/MD5 checksum: 60531 7800e904a064adf3c2df56eea63270cc
http://security.debian.org/pool/updates/main/s/screen/screen_3.9.11.orig.tar.gz
Size/MD5 checksum: 722396 19572f92404995e7b2dea8117204dd67

Alpha architecture:

http://security.debian.org/pool/updates/main/s/screen/screen_3.9.11-5woody1_alpha.deb
Size/MD5 checksum: 523248 bc1770274cc8cf05e7035ec84601a43f

ARM architecture:

http://security.debian.org/pool/updates/main/s/screen/screen_3.9.11-5woody1_arm.deb
Size/MD5 checksum: 480188 a6470b52e0a7ea519e017747267206dd

Intel IA-32 architecture:

http://security.debian.org/pool/updates/main/s/screen/screen_3.9.11-5woody1_i386.deb
Size/MD5 checksum: 461518 4f787a996b5db04abcf3eaa2f5e4f730

Intel IA-64 architecture:

http://security.debian.org/pool/updates/main/s/screen/screen_3.9.11-5woody1_ia64.deb
Size/MD5 checksum: 586442 7c8ccf8ff76925018e4eb2e8152bb7b3

HP Precision architecture:

http://security.debian.org/pool/updates/main/s/screen/screen_3.9.11-5woody1_hppa.deb
Size/MD5 checksum: 500770 7da7c865e32afc18fe1bbd32f5843c4d

Motorola 680x0 architecture:

http://security.debian.org/pool/updates/main/s/screen/screen_3.9.11-5woody1_m68k.deb
Size/MD5 checksum: 450656 96c4270b72b3aacbf68be80140335e24

Big endian MIPS architecture:

http://security.debian.org/pool/updates/main/s/screen/screen_3.9.11-5woody1_mips.deb
Size/MD5 checksum: 494872 2c6255a232455a547fc35899b8dcd7f3

Little endian MIPS architecture:

http://security.debian.org/pool/updates/main/s/screen/screen_3.9.11-5woody1_mipsel.deb
Size/MD5 checksum: 494260 b5d3bdc0e7c328d2f9af8e9c2ae28d7d

PowerPC architecture:

http://security.debian.org/pool/updates/main/s/screen/screen_3.9.11-5woody1_powerpc.deb
Size/MD5 checksum: 484050 be22d939e6d308a039fd25b019dc5bcb

IBM S/390 architecture:

http://security.debian.org/pool/updates/main/s/screen/screen_3.9.11-5woody1_s390.deb
Size/MD5 checksum: 474334 4ac4afeb09ec9cb2034383e48aaf097c

Sun Sparc architecture:

http://security.debian.org/pool/updates/main/s/screen/screen_3.9.11-5woody1_sparc.deb
Size/MD5 checksum: 482754 38a376dd775ee0f8df32b84b015a4da3

Vendor URL:  www.gnu.org/software/screen/screen.html (Links to External Site)
Cause:   Boundary error
Underlying OS:   Linux (Debian)

Message History:   This archive entry is a follow-up to the message listed below.
Nov 27 2003 GNU Screen Integer Overflow in 'ansi.c' May Let Local Users Gain Elevated Privileges



 Source Message Contents

Date:  Mon, 5 Jan 2004 15:27:11 +0100 (CET)
Subject:  [SECURITY] [DSA 408-1] New screen packages fix group utmp exploit


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

- --------------------------------------------------------------------------
Debian Security Advisory DSA 408-1                     security@debian.org
http://www.debian.org/security/                             Martin Schulze
January 5th, 2004                       http://www.debian.org/security/faq
- --------------------------------------------------------------------------

Package        : screen
Vulnerability  : integer overflow
Problem-Type   : local
Debian-specific: no
CVE ID         : CAN-2003-0972

Timo Sirainen reported a vulnerability in screen, a terminal
multiplexor with VT100/ANSI terminal emulation, that can lead an
attacker to gain group utmp privledges.

For the stable distribution (woody) this problem has been fixed in
version 3.9.11-5woody1.

For the unstable distribution (sid) this problem has been fixed in
version 4.0.2-0.1.

We recommend that you upgrade your screen 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/s/screen/screen_3.9.11-5woody1.dsc
      Size/MD5 checksum:      633 a1e5493005ceaf734b6128766d17a641
    http://security.debian.org/pool/updates/main/s/screen/screen_3.9.11-5woody1.diff.gz
      Size/MD5 checksum:    60531 7800e904a064adf3c2df56eea63270cc
    http://security.debian.org/pool/updates/main/s/screen/screen_3.9.11.orig.tar.gz
      Size/MD5 checksum:   722396 19572f92404995e7b2dea8117204dd67

  Alpha architecture:

    http://security.debian.org/pool/updates/main/s/screen/screen_3.9.11-5woody1_alpha.deb
      Size/MD5 checksum:   523248 bc1770274cc8cf05e7035ec84601a43f

  ARM architecture:

    http://security.debian.org/pool/updates/main/s/screen/screen_3.9.11-5woody1_arm.deb
      Size/MD5 checksum:   480188 a6470b52e0a7ea519e017747267206dd

  Intel IA-32 architecture:

    http://security.debian.org/pool/updates/main/s/screen/screen_3.9.11-5woody1_i386.deb
      Size/MD5 checksum:   461518 4f787a996b5db04abcf3eaa2f5e4f730

  Intel IA-64 architecture:

    http://security.debian.org/pool/updates/main/s/screen/screen_3.9.11-5woody1_ia64.deb
      Size/MD5 checksum:   586442 7c8ccf8ff76925018e4eb2e8152bb7b3

  HP Precision architecture:

    http://security.debian.org/pool/updates/main/s/screen/screen_3.9.11-5woody1_hppa.deb
      Size/MD5 checksum:   500770 7da7c865e32afc18fe1bbd32f5843c4d

  Motorola 680x0 architecture:

    http://security.debian.org/pool/updates/main/s/screen/screen_3.9.11-5woody1_m68k.deb
      Size/MD5 checksum:   450656 96c4270b72b3aacbf68be80140335e24

  Big endian MIPS architecture:

    http://security.debian.org/pool/updates/main/s/screen/screen_3.9.11-5woody1_mips.deb
      Size/MD5 checksum:   494872 2c6255a232455a547fc35899b8dcd7f3

  Little endian MIPS architecture:

    http://security.debian.org/pool/updates/main/s/screen/screen_3.9.11-5woody1_mipsel.deb
      Size/MD5 checksum:   494260 b5d3bdc0e7c328d2f9af8e9c2ae28d7d

  PowerPC architecture:

    http://security.debian.org/pool/updates/main/s/screen/screen_3.9.11-5woody1_powerpc.deb
      Size/MD5 checksum:   484050 be22d939e6d308a039fd25b019dc5bcb

  IBM S/390 architecture:

    http://security.debian.org/pool/updates/main/s/screen/screen_3.9.11-5woody1_s390.deb
      Size/MD5 checksum:   474334 4ac4afeb09ec9cb2034383e48aaf097c

  Sun Sparc architecture:

    http://security.debian.org/pool/updates/main/s/screen/screen_3.9.11-5woody1_sparc.deb
      Size/MD5 checksum:   482754 38a376dd775ee0f8df32b84b015a4da3


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

- ---------------------------------------------------------------------------------
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 <pkg>' and http://packages.debian.org/<pkg>

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.2.3 (GNU/Linux)

iD8DBQE/+XQ/W5ql+IAeqTIRAoCJAJ0dddim7GH0uHad9P3zOd/GykuX1gCcD5Kh
XfougGBsMkGzh7dNQcDDOXY=
=K0eo
-----END PGP SIGNATURE-----


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