hubertf's NetBSD Blog
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[20161030] NetBSD 7.0.2 released
Why 7.0.2? Following NetBSD's release scheme, there are major releases (e.g. 7.0) with subsequent updates (e.g. 7.1). Those "major" release and their updates include both new features as well as bug fixes - the latter one again with and without security relevance. New code, new risks - as a result for getting updates, existing interfaces may change and lead to incompatibiltites. This may affect either binary compatibility between programs and their required shared libraries, as well - though rare - incompatible chances on the source code level.

NetBSD takes quite some effort to keep such incompatibilites low, yet they happen. The only real solutions is: no updates. "Never change a running system" is nice for availability, but it poses security risks. The time when a big server uptime was considered a sign of good system administration are gone. Today, a long update means the system (probably) runs outdated and as such vulnerable code.

So to solve the problem a compromise is needed: little updates, but crucial security updates do get done. Which is where NetBSD's "minor" release like NetBSD 7.0.2 come into play. With its set of changes, a number of external software packages got security-related updates (e.g. OpenSSL, NTP, BIND, X), and a smaller number of security related changes were also added, e.g. a race condition in mail.local(8), crashes in the Networking File System (NFS) and the native Fast File System (FFS) plus some platform-specific crashes on MIPS, PowerPC and SPARC64.

For more information on downloading and installation see the release announcement as well as the platform-specific install documentation, e.g. for NetBSD 7.0.2/arm64's INSTALL.html file.

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[20111216] Two new NetBSD Security Advisories: OpenPAM and BIND resolver
The NetBSD Security Officers have released two new security advisories about problems found in 3rd party software that comes bundled with NetBSD's base system, OpenPAM and the BIND resolver.
  • NetBSD Security Advisory 2011-008: OpenPAM privilege escalation

    Affects pkgsrc, all release branches and -current before 2011-11-09, it's fixed in all branches (current, netbsd-4 and -5) after that date.

    Details from the advisory: ``The pam_start() function of OpenPAM doesn't check the "service" argument. With a relative path it can be tricked into reading a config file from an arbitrary location. NetBSD base utilities pass fixed constant strings. 3rd party programs which run with elevated privileges and allow user chosen strings open an attack vector.''

  • NetBSD Security Advisory 2011-009: BIND resolver DoS:

    Affects pkgsrc, all release branches and -current from before 2011-11-20, it's fixed in the CVS branches after 2011-11-20.

    Details from the advisory: ``Unpatched BIND 9 resolvers may cache an invalid record, subsequent queries for which could crash the resolvers with an assertion failure. ISC provided a patch which makes named recover gracefully from the inconsistency, preventing the abnormal exit.

    The patch has two components. When a client query is handled, the code which processes the response to the client has to ask the cache for the records for the name that is being queried. The first component of the patch prevents the cache from returning the inconsistent data. The second component prevents named from crashing if it detects that it has been given an inconsistent answer of this nature.''

Happy updating!

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[20081028] More security advisories: IPv6, ftpd, bind
Three new security advisories have been released: Also, there's an update to an old SA: Stay Safe, Stay Sane, Stay Secure. Stay NetBSD!

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[20080726] New security advisory: BIND cache poisoning
There's been quite some hoopla about the latest DNS bogons found. NetBSD has a security advisory out now: Juicy details include a number of further background links, the list of affected operating system versions (current before Jul 10, netbsd-4 before Jul 24), how to work around the problem by instructing IPfilter for people using NAT/PAT, and most important detailed upgrade instructions on what needs to be rebuilt on various NetBSD branches/releases to sleep well again.

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'nuff. Grab the RSS-feed, index, or go back to my regular NetBSD page

Disclaimer: All opinion expressed here is purely my own. No responsibility is taken for anything.

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