Contributed by grey on from the we'll keep posting errata as stories dept.
Insufficient checking in the zlib compression library (installed as libz on OpenBSD) can result in a buffer overflow and a program crash. It is not known at this time whether maliciously-crafted compressed files can be used to execute arbitrary code.
Since zlib is in wide use throughout the base OS, as well as in ports, users are advised to patch their systems as soon as possible.
A fix has been committed to OpenBSD-current as well as the 3.6 and 3.7 -stable branches. Patches are also available for OpenBSD 3.6 and 3.7. OpenBSD versions 3.4 and lower are not affected as they use an older version of zlib that does not contain the vulnerable code.
The 3.6 patch also applies to OpenBSD 3.5.
As always, be sure to check http://www.openbsd.org/errata.html as well.
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