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AUSCERT External Security Bulletin Redistribution
ESB-2001.337 -- Debian Security Advisory DSA-071-1
fetchmail remote exploit
14 August 2001
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AusCERT Security Bulletin Summary
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Product: fetchmail
Vendor: Debian
Operating System: Debian GNU/Linux 2.2
Platform: Alpha
ARM
i386
Motorola 680x0
PowerPC
Sparc
Impact: Execute Arbitrary Code/Commands
Access Required: Remote
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Debian Security Advisory DSA-071-1 security@debian.org
http://www.debian.org/security/ Wichert Akkerman
August 10, 2001
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Package : fetchmail
Problem type : memory corruption
Debian-specific: no
Salvatore Sanfilippo found two remotely exploitable problems in
fetchmail while doing a security audit. In both the imap and pop3 code
the input is not verified and used to store a number in an array. Since
no bounds checking is done this can be used by an attacker to write
arbitrary data in memory. An attacker can use this if we can get a user
to transfer mail from a custom imap or pop3 server he controls.
This has been fixed in version 5.3.3-3.
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/fetchmail_5.3.3-3.diff.gz
MD5 checksum: a1ba0691be21e100b10beded89813911
http://security.debian.org/dists/stable/updates/main/source/fetchmail_5.3.3-3.dsc
MD5 checksum: b49e9eacda18f237ae066f085647d3f7
http://security.debian.org/dists/stable/updates/main/source/fetchmail_5.3.3.orig.tar.gz
MD5 checksum: d2cffc4594ec2d36db6681b800f25e2a
Architecture independent archives:
http://security.debian.org/dists/stable/updates/main/binary-all/fetchmailconf_5.3.3-3_all.deb
MD5 checksum: 223c6590b7495a41d4743d526222bc4f
Alpha architecture:
http://security.debian.org/dists/stable/updates/main/binary-alpha/fetchmail_5.3.3-3_alpha.deb
MD5 checksum: 75249ba9604e732e07a1b2147b6e155e
ARM architecture:
http://security.debian.org/dists/stable/updates/main/binary-arm/fetchmail_5.3.3-3_arm.deb
MD5 checksum: 80a201b1e25ff5c301ccfd2cbfa6cd8e
Intel IA-32 architecture:
http://security.debian.org/dists/stable/updates/main/binary-i386/fetchmail_5.3.3-3_i386.deb
MD5 checksum: 1d9e300f957b35486e2aefcff87e43c7
Motorola 680x0 architecture:
http://security.debian.org/dists/stable/updates/main/binary-m68k/fetchmail_5.3.3-3_m68k.deb
MD5 checksum: 9bdf5c4712b7dec94f644e58635bee9b
PowerPC architecture:
http://security.debian.org/dists/stable/updates/main/binary-powerpc/fetchmail_5.3.3-3_powerpc.deb
MD5 checksum: 1f97930cf7c8c4442362d6c5f27465cb
Sun Sparc architecture:
http://security.debian.org/dists/stable/updates/main/binary-sparc/fetchmail_5.3.3-3_sparc.deb
MD5 checksum: fb060d4e74f6f1a84823829a21d54b19
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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