security advisorydenial of servicecritical
When a mail is to be delivered locally to a user that doesn'texist, nullmailer tries to deliver it, discovers a user unknown errorand stops delivering. Unfortunately, it stops delivering entirely,not only this mail.. -------------------------------------------------------------------------- Debian Security Advisory DSA 198-1 This email address is being protected from spambots. You need JavaScript enabled to view it. Debian -- Security Information Martin Schulze November 18th, 2002 Debian -- Debian security FAQ -------------------------------------------------------------------------- Package : nullmailer Vulnerability : denial of service Problem-type : local Debian-specific: no A problem has been discovered in nullmailer, a simple relay-only mail transport agent for hosts that relay mail to a fixed set of smart relays. When a mail is to be delivered locally to a user that doesn't exist, nullmailer tries to deliver it, discovers a user unknown error and stops delivering. Unfortunately, it stops delivering entirely, not only this mail. Hence, it's very easy to craft a denial of service. This problem has been fixed in version 1.00RC5-16.1woody2 for the current stable distribution (woody) and in version 1.00RC5-17 for the unstable distribution (sid). The old stable distribution (potato) does not contain a nullmailer package. We recommend that you upgrade your nullmailer package. 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: Size/MD5 checksum: 602 39d11580de5a781c1cadf6d422164d8c Size/MD5 checksum: 6298179e56c04af207b19ff020f66b580419 Size/MD5 checksum: 111691 61041ff5b1e41f9280d63a04c3383144 Alpha architecture: Size/MD5 checksum: 103944 e46443575ae0a0d55475423b1e31bdeb ARM architecture: Size/MD5 checksum: 70804 2feab48d3941330c03f00567488831f5 Intel IA-32 architecture: Size/MD5 checksum: 68558 ec8e1b3f33bc436897358c80a6f43b3c Intel IA-64 architecture: Size/MD5 checksum: 144246 c508c104d7b775e84641aabdc2adf209 HP Precision architecture: Size/MD5 checksum: 88306 87b75f52b7ae1e8bdab2a121b79492bd Motorola 680x0 architecture: Size/MD5 checksum: 67616 29f83614261e229bff40b1c54b12fa3b Big endian MIPS architecture: Size/MD5 checksum: 102682 91e6a2aabc65fb2b430619dc625a6485 Little endian MIPS architecture: Size/MD5 checksum: 101292 83745fe1ea40cdefb298e2d55f1e0a2b PowerPC architecture: Size/MD5 checksum: 73996 81bbf1beb5a46a08405d1e4535b4ae44 IBM S/390 architecture: Size/MD5 checksum: 72914 3e5608138030d4577e14e0f17144a2ff Sun Sparc architecture: Size/MD5 checksum: 73748 cb947e14ce9c2803d55f959d4f03f454 These files will probably be moved into the stable distribution on its next revision. Survey on the use of Debian GNU/Linux 2.2 alias potato: Survey on the use of Debian 2.2 (potato) --------------------------------------------------------------------------------- For apt-get: deb Debian -- Security Information stable/updates main For dpkg-ftp: dists/stable/updates/main Mailing list: This email address is being protected from spambots. You need JavaScript enabled to view it. Package info: `apt-cache show ' and https://www.debian.org/distrib/packages . Nullmailer faces a Critical Denial of Service issue in Debian 3.0. Learn how to secure your mail delivery now.. Denial Of Service, Debian 3.0, Nullmailer Advisory. . Severity: Critical. LinuxSecurity.com Team
Nov 18, 2002
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