Openswan is a free implementation of Internet Protocol Security (IPsec) and Internet Key Exchange (IKE). IPsec uses strong cryptography to provide both authentication and encryption services.
These services allow you to build secure tunnels through untrusted networks.

A use-after-free flaw was found in the way Openswan's pluto IKE daemon used cryptographic helpers. A remote, authenticated attacker could send a specially crafted IKE packet that would crash the pluto daemon.
This issue only affected SMP (symmetric multiprocessing) systems that have the cryptographic helpers enabled. The helpers are disabled by default on Scientific Linux 5, but enabled by default on Scientific Linux 6. (CVE-2011-4073)

All users of openswan are advised to upgrade to these updated packages, which contain a backported patch to correct this issue.
After installing this update, the ipsec service will be restarted automatically.

A use-after-free flaw was found in the way Openswan's pluto IKE daemon used cryptographic helpers. A remote, authenticated attacker could send a specially crafted IKE packet that would crash the pluto daemon.
This issue only affected SMP (symmetric multiprocessing) systems that have the cryptographic helpers enabled.

The remote Redhat Enterprise Linux 6 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2011:1422 advisory.

    Openswan is a free implementation of Internet Protocol Security (IPsec)     and Internet Key Exchange (IKE). IPsec uses strong cryptography to provide     both authentication and encryption services. These services allow you to     build secure tunnels through untrusted networks.

    A use-after-free flaw was found in the way Openswan's pluto IKE daemon used     cryptographic helpers. A remote, authenticated attacker could send a     specially-crafted IKE packet that would crash the pluto daemon. This issue     only affected SMP (symmetric multiprocessing) systems that have the     cryptographic helpers enabled. The helpers are disabled by default on Red     Hat Enterprise Linux 5, but enabled by default on Red Hat Enterprise Linux     6. (CVE-2011-4073)

    Red Hat would like to thank the Openswan project for reporting this issue.
    Upstream acknowledges Petar Tsankov, Mohammad Torabi Dashti and David Basin     of the information security group at ETH Zurich as the original reporters.

    All users of openswan are advised to upgrade to these updated packages,     which contain a backported patch to correct this issue. After installing     this update, the ipsec service will be restarted automatically.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Fixes for CVE-2011-4073.

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

openswan's crypto helper was prone to an use-after-free flaw which could potentially allow remote attackers to cause a Denial of Service (CVE-2011-4073, bnc#727002). Additionally, the following issues have been fixed :

  - AH handshake problems (bnc#713986),

  - potential dereference of no longer valid pointers,

  - mode handling issues

The remote host is affected by the vulnerability described in GLSA-201203-13 (Openswan: Denial of Service)

    Two vulnerabilities have been found in Openswan:
      Improper permissions are used on /var/run/starter.pid and         /var/lock/subsys/ipsec (CVE-2011-2147).
      Openswan contains a use-after-free error in the cryptographic helper         handler (CVE-2011-4073).
  Impact :

    A remote authenticated attacker or a local attacker may be able to cause       a Denial of Service condition.
  Workaround :

    There is no known workaround at this time.

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
61167	Scientific Linux Security Update : openswan on SL5.x, SL6.x i386/x86_64	Nessus	Scientific Linux Local Security Checks	2012/8/1	2021/1/14	medium
69577	Amazon Linux AMI : openswan (ALAS-2011-18)	Nessus	Amazon Linux Local Security Checks	2013/9/4	2018/4/18	medium
56698	RHEL 6 : openswan (RHSA-2011:1422)	Nessus	Red Hat Local Security Checks	2011/11/3	2025/4/14	medium
57071	Fedora 14 : openswan-2.6.33-3.fc14 (2011-15127)	Nessus	Fedora Local Security Checks	2011/12/12	2021/1/11	medium
57125	SuSE 11.1 Security Update : openswan (SAT Patch Number 5424)	Nessus	SuSE Local Security Checks	2011/12/13	2021/1/19	medium
58378	GLSA-201203-13 : Openswan: Denial of Service	Nessus	Gentoo Local Security Checks	2012/3/19	2021/1/6	medium

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