This is the OpenBSD 4.0 release errata & patch list:

The patches below are available in CVS via the OPENBSD_4_0 patch branch.

For more detailed information on how to install patches to OpenBSD, please consult the OpenBSD FAQ.

• 017: SECURITY FIX: October 10, 2007   All architectures
  The SSL_get_shared_ciphers() function in OpenSSL contains an off-by-one overflow.
  A source code patch exists which remedies this problem.

• 016: SECURITY FIX: October 8, 2007   All architectures
  Malicious DHCP clients could cause dhcpd(8) to corrupt its stack
  A DHCP client that claimed to require a maximum message size less than the minimum IP MTU could cause dhcpd(8) to overwrite stack memory.
  A source code patch exists which remedies this problem.

• 015: SECURITY FIX: July 9, 2007   All Architectures
  Fix possible heap overflow in file(1), aka CVE-2007-1536.
  A source code patch exists which remedies this problem.

• 014: STABILITY FIX: May 9, 2007   All Architectures
  A malicious client can cause a division by zero.
  A source code patch exists which remedies this problem.

• 013: STABILITY FIX: April 26, 2007   PowerPC
  An unhandled AltiVec assist exception can cause a kernel panic.
  A source code patch exists which remedies this problem.

• 012: SECURITY FIX: April 23, 2007   All architectures
  IPv6 type 0 route headers can be used to mount a DoS attack against hosts and networks. This is a design flaw in IPv6 and not a bug in OpenBSD.
  A source code patch exists which remedies this problem.

• 011: SECURITY FIX: April 4, 2007   All architectures
  Multiple vulnerabilities have been discovered in X.Org.
  XC-MISC extension ProcXCMiscGetXIDList memory corruption vulnerability, BDFFont parsing integer overflow vulnerability, fonts.dir file parsing integer overflow vulnerability, multiple integer overflows in the XGetPixel() and XInitImage functions in ImUtil.c. CVE-2007-1003, CVE-2007-1351, CVE-2007-1352, CVE-2007-1667.
  A source code patch exists which remedies this problem.

• 010: SECURITY FIX: March 7, 2007   All architectures
  2nd revision, March 17, 2007
  Incorrect mbuf handling for ICMP6 packets.
  Using pf(4) to avoid the problem packets is an effective workaround until the patch can be installed.
  Use "block in inet6" in /etc/pf.conf
  A source code patch exists which remedies this problem.

• 009: INTEROPERABILITY FIX: February 4, 2007   All architectures
  A US daylight saving time rules change takes effect in 2007.
  A source code patch exists which syncs the timezone data files with tzdata2007a.
  

• 008: RELIABILITY FIX: January 16, 2007   All architectures
  Under some circumstances, processing an ICMP6 echo request would cause the kernel to enter an infinite loop.
  A source code patch exists which remedies this problem.

• 007: SECURITY FIX: January 3, 2007   i386 only
  Insufficient validation in vga(4) may allow an attacker to gain root privileges if the kernel is compiled with option PCIAGP and the actual device is not an AGP device. The PCIAGP option is present by default on i386 kernels only.
  A source code patch exists which remedies this problem.

• 006: FTP DISTRIBUTION ERROR: December 4, 2006   All architectures
  The src.tar.gz and ports.tar.gz archives released on FTP were created incorrectly, a week after the 4.0 release. The archives on the CD sets are correct; this only affects people who downloaded them from a mirror.
  The archives have been corrected. The correct MD5 of ports.tar.gz is eff352b4382a7fb7ffce1e8b37e9eb56, and for src.tar.gz it is b8d7a0dc6f3d27a5377a23d69c40688e.
  

• 005: SECURITY FIX: November 19, 2006   All architectures
  The ELF ld.so(1) fails to properly sanitize the environment. There is a potential localhost security problem in cases we have not found yet. This patch applies to all ELF-based systems (m68k, m88k, and vax are a.out-based systems).
  A source code patch exists which remedies this problem.

• 004: RELIABILITY FIX: November 7, 2006   All architectures
  Due to a bug in the arc(4) RAID driver the driver will not properly synchronize the cache to the logical volumes upon system shut down. The result being that the mounted file systems within the logical volumes will not be properly marked as being clean and fsck will be run for the subsequent boot up.
  A source code patch exists which remedies this problem.

• 003: SECURITY FIX: November 4, 2006   All architectures
  Fix for an integer overflow in systrace(4)'s STRIOCREPLACE support, found by Chris Evans. This could be exploited for DoS, limited kmem reads or local privilege escalation.
  A source code patch exists which remedies this problem.

• 002: SECURITY FIX: November 4, 2006   All architectures
  Several problems have been found in OpenSSL. While parsing certain invalid ASN.1 structures an error condition is mishandled, possibly resulting in an infinite loop. A buffer overflow exists in the SSL_get_shared_ciphers function. A NULL pointer may be dereferenced in the SSL version 2 client code. In addition, many applications using OpenSSL do not perform any validation of the lengths of public keys being used. CVE-2006-2937, CVE-2006-3738, CVE-2006-4343, CVE-2006-2940
  A source code patch exists which remedies this problem.

• 001: SECURITY FIX: November 4, 2006   All architectures
  httpd(8) does not sanitize the Expect header from an HTTP request when it is reflected back in an error message, which might allow cross-site scripting (XSS) style attacks. CVE-2006-3918
  A source code patch exists which remedies this problem.