Version 5.1.1¶

• Fixed a denial-of-service vulnerability and potential authorization bypass
  triggered by a crafted ID_DER_ASN1_DN ID payload. The cause is an insufficient
  length check when comparing such identities. The vulnerability has been
  registered as CVE-2013-6075.
  Refer to our blog for details.

• Fixed a denial-of-service vulnerability triggered by a crafted IKEv1
  fragmentation payload. The cause is a NULL pointer dereference. The
  vulnerability has been registered as CVE-2013-6076.
  Refer to our blog for details.

• The lean stand-alone pt-tls-client can set up a RFC 6876 PT-TLS session
  with a strongSwan policy enforcement point which uses the tnc-pdp charon
  plugin.

• The new TCG TNC SWID IMC/IMV pair supports targeted SWID requests for either
  full SWID Tag or concise SWID Tag ID inventories.

• The XAuth backend in eap-radius now supports multiple XAuth exchanges for
  different credential types and display messages. All user input gets
  concatenated and verified with a single User-Password RADIUS attribute on
  the AAA. With an AAA supporting it, one for example can implement
  Password+Token authentication with proper dialogs on iOS and OS X clients.

• charon supports IKEv1 Mode Config exchange in push mode. The ipsec.conf
  modeconfig=push option enables it for both client and server, the same way
  as pluto used it.

• Using the ah ipsec.conf keyword on both IKEv1 and IKEv2 connections,
  charon can negotiate and install Security Associations integrity-protected by
  the Authentication Header protocol. Supported are plain AH(+IPComp) SAs only,
  but not the deprecated RFC 2401 style ESP+AH bundles.

• The generation of initialization vectors for IKE and ESP (when using libipsec)
  is now modularized and IVs for e.g. AES-GCM are now correctly allocated
  sequentially, while other algorithms like AES-CBC still use random IVs.

• The left and right options in ipsec.conf can take multiple address ranges
  and subnets. This allows connection matching against a larger set of
  addresses, for example to use a different connection for clients connecting
  from an internal network.

• For all those who have a queasy feeling about the NIST elliptic curve set,
  the Brainpool curves introduced for use with IKE by RFC 6932 might be a
  more trustworthy alternative.

• The kernel-libipsec userland IPsec backend now supports usage statistics,
  volume based rekeying and accepts ESPv3 style TFC padded packets.

• With two new strongswan.conf options fwmarks can be used to implement
  host-to-host tunnels with kernel-libipsec.

• libipsec now properly calculates padding length especially for AES-GCM.

• load-tester supports transport mode connections and more complex traffic
  selectors, including such using unique ports for each tunnel.

• The new dnscert plugin provides support for authentication via CERT RRs that
  are protected via DNSSEC. The plugin was created by Ruslan N. Marchenko.

• The eap-radius plugin supports forwarding of several Cisco Unity specific
  RADIUS attributes in corresponding configuration payloads.

• The ipsec pki utility and its subcommands all received man pages.
  The command itself is now installed in $prefix/bin by default. So the ipsec
  prefix is now optional.

• pki --pub is able to convert public keys to other formats (e.g. DNSKEY or SSH).

• Database transactions are now abstracted and implemented by the two backends.
  If you use MySQL make sure all tables use the InnoDB engine.

• libstrongswan now can provide an experimental custom implementation of the
  printf family functions based on klibc if neither Vstr nor glibc style printf
  hooks are available. This can avoid the Vstr dependency on some systems at
  the cost of slower and less complete printf functions.

• Handling of ICMP[v6] has been improved. For instance, traffic selectors with
  specific ICMP message type and code can now be configured in ipsec.conf
  and are properly installed in the kernel.

• IKEv1 reauthentication should be more stable with third-party peers (ee99f37e, d2e4dd75).

• Fixes a regression in 5.1.0 that caused a segmentation fault when reestablishing
  CHILD_SAs due to closeaction=restart|hold (e42ab08a).

• Fixes a regression in 5.1.0 that caused IP addresses on ignored, down or loopback
  interfaces to get ignored when searching for an address contained in the local traffic
  selector (d7ae0b254).

• The calculation of the ESN bitmap length in the kernel-netlink plugin was fixed (e001cc2b).

• When removing configs via stroke plugin (e.g. with ipsec update/reload) matching
  peer configs are not removed anymore, if they are still used by other child configs (791fde16).

• reqids of established CHILD_SAs are reused when routing connections via stroke plugin (32fef0c6).

• The value for xfrm_acq_expires can now be configured via strongswan.conf (255b9dac).