Debian: New pdns-recursor packages fix predictable randomness
Summary
- ------------------------------------------------------------------------Debian Security Advisory DSA-1544-2 security@debian.org http://www.debian.org/security/ Florian Weimer July 16, 2008 http://www.debian.org/security/faq - ------------------------------------------------------------------------Package : pdns-recursor Vulnerability : insufficient randomness Problem type : remote Debian-specific: no CVE Id(s) : CVE-2008-1637 Debian Bug : 490069 Thomas Biege discovered that the upstream fix for the weak random number generator released in DSA-1544-1 was incomplete: Source port randomization did still not use difficult-to-predict random numbers. This is corrected in this security update. Here is the text of the original advisory: Amit Klein discovered that pdns-recursor, a caching DNS resolver, uses a weak random number generator to create DNS transaction IDs and UDP source port numbers. As a result, cache poisoning attacks were simplified. (CVE-2008-1637) In the light of recent DNS-related developments (documented in DSAs 1603, 1604, 1605), we recommend that this update is installed as an additional safety measure. (The lack of source port randomization was addressed in the 3.1.6 upstream version.) In addition, this update incorporates the changed IP address of L.ROOT-SERVERS.NET. For the stable distribution (etch), this problem has been fixed in version 3.1.4-1+etch2. For the unstable distribution (sid), this problem has been fixed in version 3.1.7-1. We recommend that you upgrade your pdns-recursor 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 4.0 alias etch - -------------------------------Source archives: Size/MD5 checksum: 34915 0d67af6859a24778f87137fb159b19d6 Size/MD5 checksum: 171270 e35d774e3282285a59a7f8038a036b61 Size/MD5 checksum: 1198 264388cc310a18ffcede810e510d26dc alpha architecture (DEC Alpha) Size/MD5 checksum: 499184 d975957b892261bef540029738fbc816 amd64 architecture (AMD x86_64 (AMD64)) Size/MD5 checksum: 418498 f5c48c3dfa05a888c38416b7c3b1e9ee i386 architecture (Intel ia32) Size/MD5 checksum: 433786 33e5e4d147b1f7408dee93f014845e4b ia64 architecture (Intel ia64) Size/MD5 checksum: 598166 f1b98150ec6cb205eb10d5dcc69f1684 powerpc architecture (PowerPC) Size/MD5 checksum: 434308 4d9376157024a98cb3217f884c74f42f s390 architecture (IBM S/390) Size/MD5 checksum: 408966 87930fd404bbab5c43332711511fedc7 These files will probably be moved into the stable distribution on its next update. - ---------------------------------------------------------------------------------For apt-get: deb http://security.debian.org/ stable/updates main For dpkg-ftp: dists/stable/updates/main Mailing list: debian-security-announce@lists.debian.org