Debian: 'screen' vulnerability |

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Debian Security Advisory                             [email protected]                            Michael Stone
September  2, 2000
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Package: screen
Vulnerability: local exploit
Debian-specific: no

A format string bug was recently discovered in screen which can be used
to gain elevated privilages if screen is setuid. Debian 2.1 (slink) did
ship screen setuid and the exploit can be used to gain root privilages.
In Debian 2.2 (potato) screen is not setuid, and is not vulnerable to a
root exploit. screen is, however, setgid utmp in Debian 2.2 (potato) and
we recommend upgrading.

A fixed version of screen is available in version 3.7.4-9.1 for Debian
2.1 (slink) and in version 3.9.5-9 for Debian 2.2 (potato).

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

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

Debian GNU/Linux 2.1 alias slink
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  Slink was released for alpha, i386, m68k and sparc architectures.
  We are releasing binary packages for i386 only at this time.
  Source archives:
      MD5 checksum: 20af8bde6e87398db100a817ab81c173
      MD5 checksum: 8c391f8c6a9af846b60701c6677e4d25
      MD5 checksum: c5ab40b068968075e41e25607dfce543
  Intel ia32 archives:
      MD5 checksum: a62f293aa7e0876cf49d51d3d216c09a

Debian GNU/Linux 2.2 alias potato
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  Potato was released for the alpha, arm, i386, m68k, powerpc and sparc
  architectures. At this moment packages  for m68k are not yet
  available. As soon as they are ready we will put them online and
  list them on the security pages at

  Source archives:
      MD5 checksum: ac7f482241e3d26df3ebe8a77090d862
      MD5 checksum: e4b616aed2e0653a60f81a0febdde994
      MD5 checksum: ac7dd525b0920bc98e4af75b0f73c73e

  Alpha architecture:
      MD5 checksum: beed25398f11afcb8cedb38c9ad0b369

  ARM architecture:
      MD5 checksum: d68e85b057eb4d362b4b5421ea0de977

  Intel ia32 architecture:
      MD5 checksum: 139c65e404139f6681a4e60b4ef708f1

  PowerPC architecture:
      MD5 checksum: af26d17cc292797ff1ebeab7fd1c29ae

  Sun Sparc architecture:
      MD5 checksum: 05b7392240ca7ed901a47a7f643030d3

For not yet released architectures please refer to the appropriate
directory$arch/ .

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For apt-get: deb stable/updates main
dpkg - dists/stable/updates/main
Mailing list: [email protected]
Version: GnuPG v1.0.2 (GNU/Linux)
Comment: For info see


Debian: 'screen' vulnerability

September 4, 2000
A format string bug was recently discovered in screen which can be used to gain elevated privilages if screen is setuid.



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