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AUSCERT External Security Bulletin Redistribution
ESB-2001.283 -- Debian Security Advisory DSA-066-1
cfingerd remote exploit
12 July 2001
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AusCERT Security Bulletin Summary
---------------------------------
Product: cfingerd
Vendor: Debian
Operating System: Debian GNU/Linux 2.2
Linux
Platform: Alpha
ARM
i386
m68k
PowerPC
Sparc
Impact: Execute Arbitrary Code/Commands
Access Required: Existing Account
Ref: ESB-2001.167
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Debian Security Advisory DSA-066-1 security@debian.org
http://www.debian.org/security/ Wichert Akkerman
July 11, 2001
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Package : cfingerd
Problem type : remote exploit
Debian-specific: no
Steven van Acker reported on bugtraq that the version of cfingerd (a
configurable finger daemon) as distributed in Debian GNU/Linux 2.2
suffers from two problems:
1. The code that reads configuration files (files in which $ commands are
expanded) copied its input to a buffer without checking for a buffer
overflow. When the ALLOW_LINE_PARSING feature is enabled that code
is used for reading users files as well, so local users could exploit
this.
2. There also was a printf call in the same routine that did not protect
against printf format attacks.
Since ALLOW_LINE_PARSING is enabled in the default /etc/cfingerd.conf
local users could use this to gain root access.
This has been fixed in version 1.4.1-1.2, and we recommend that you upgrade
your cfingerd package immediately.
wget url
will fetch the file for you
dpkg -i file.deb
will install the referenced file.
Debian GNU/Linux 2.2 alias potato
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Potato was released for alpha, arm, i386, m68k, powerpc and sparc.
Source archives:
http://security.debian.org/dists/stable/updates/main/source/cfingerd_1.4.1-1.2.diff.gz
MD5 checksum: e1e5ed3fe85f2af5304b9f0d3d236a91
http://security.debian.org/dists/stable/updates/main/source/cfingerd_1.4.1-1.2.dsc
MD5 checksum: 966e205737bcd43182d01114694ed52a
http://security.debian.org/dists/stable/updates/main/source/cfingerd_1.4.1.orig.tar.gz
MD5 checksum: 0461179bca7bb9b00fb23c0886666cb0
Alpha architecture:
http://security.debian.org/dists/stable/updates/main/binary-alpha/cfingerd_1.4.1-1.2_alpha.deb
MD5 checksum: 9c43dd39460c58ed6a0134333349e2f9
ARM architecture:
http://security.debian.org/dists/stable/updates/main/binary-arm/cfingerd_1.4.1-1.2_arm.deb
MD5 checksum: 70da6073d42fbbdd29a025517127ebb0
Intel IA-32 architecture:
http://security.debian.org/dists/stable/updates/main/binary-i386/cfingerd_1.4.1-1.2_i386.deb
MD5 checksum: 2281e1aa8dc439680b1df546a5139aae
Motorola 680x0 architecture:
http://security.debian.org/dists/stable/updates/main/binary-m68k/cfingerd_1.4.1-1.2_m68k.deb
MD5 checksum: 19bf9fbcf1d2e1d7d38ff5bd00c6dc0a
PowerPC architecture:
http://security.debian.org/dists/stable/updates/main/binary-powerpc/cfingerd_1.4.1-1.2_powerpc.deb
MD5 checksum: 383389307d0ebd11b3f8a20abe1395a9
Sun Sparc architecture:
http://security.debian.org/dists/stable/updates/main/binary-sparc/cfingerd_1.4.1-1.2_sparc.deb
MD5 checksum: 1e734a8573e1c05d8e07ffcc8543c4e9
These packages will be moved into the stable distribution on its next
revision.
For not yet released architectures please refer to the appropriate
directory ftp://ftp.debian.org/debian/dists/sid/binary-$arch/ .
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apt-get: deb http://security.debian.org/ stable/updates main
dpkg-ftp: ftp://security.debian.org/debian-security dists/stable/updates/main
Mailing list: debian-security-announce@lists.debian.org
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