CVE-2018-6918
CVSSN/A
发布时间 :2018-04-04 10:29:00
修订时间 :2018-04-06 21:29:08
NMPS    

[原文]In FreeBSD before 11.1-STABLE, 11.1-RELEASE-p9, 10.4-STABLE, 10.4-RELEASE-p8 and 10.3-RELEASE-p28, the length field of the ipsec option header does not count the size of the option header itself, causing an infinite loop when the length is zero. This issue can allow a remote attacker who is able to send an arbitrary packet to cause the machine to crash.


[CNNVD]CNNVD数据暂缺。


[机译]译文暂缺.

- CVSS (基础分值)

CVSS暂不可用

- CPE (受影响的平台与产品)

产品及版本信息(CPE)暂不可用

- OVAL (用于检测的技术细节)

未找到相关OVAL定义

- 官方数据库链接

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-6918
(官方数据源) MITRE
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-6918
(官方数据源) NVD

- 其它链接及资源

http://www.securityfocus.com/bid/103666
(UNKNOWN)  BID  103666
http://www.securitytracker.com/id/1040628
(UNKNOWN)  SECTRACK  1040628
https://security.FreeBSD.org/advisories/FreeBSD-SA-18:05.ipsec.asc
(UNKNOWN)  FREEBSD  FreeBSD-SA-18:05

- 漏洞信息 (F147044)

FreeBSD Security Advisory - FreeBSD-SA-18:05.ipsec (PacketStormID:F147044)
2018-04-04 00:00:00
Maxime Villard  security.freebsd.org
advisory,remote,arbitrary
freebsd
CVE-2018-6918
[点击下载]

FreeBSD Security Advisory - The length field of the option header does not count the size of the option header itself. This causes a problem when the length is zero, the count is then incremented by zero, which causes an infinite loop. In addition there are pointer/offset mistakes in the handling of IPv4 options. A remote attacker who is able to send an arbitrary packet, could cause the remote target machine to crash.

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512

=============================================================================
FreeBSD-SA-18:05.ipsec                                      Security Advisory
                                                          The FreeBSD Project

Topic:          ipsec crash or denial of service

Category:       core
Module:         ipsec
Announced:      2018-04-04
Credits:        Maxime Villard
Affects:        All supported versions of FreeBSD.
Corrected:      2018-01-31 09:24:48 UTC (stable/11, 11.1-STABLE)
                2018-04-04 05:37:52 UTC (releng/11.1, 11.1-RELEASE-p9)
                2018-01-31 09:26:28 UTC (stable/10, 10.4-STABLE)
                2018-04-04 05:37:52 UTC (releng/10.4, 10.4-RELEASE-p8)
                2018-04-04 05:37:52 UTC (releng/10.3, 10.3-RELEASE-p29)
CVE Name:       CVE-2018-6918

For general information regarding FreeBSD Security Advisories,
including descriptions of the fields above, security branches, and the
following sections, please visit <URL:https://security.FreeBSD.org/>.

I.   Background

The IPsec suite of protocols provide network level security for IPv4 and IPv6
packets.  FreeBSD includes software originally developed by the KAME project
which implements the various protocols that make up IPsec.

In IPsec, the IP Authentication Header (AH) is used to provide protection
against replay attacks and connectionless integrity and data origin
authentication for IP datagrams.

II.  Problem Description

The length field of the option header does not count the size of the option
header itself.  This causes a problem when the length is zero, the count is
then incremented by zero, which causes an infinite loop.

In addition there are pointer/offset mistakes in the handling of IPv4
options.

III. Impact

A remote attacker who is able to send an arbitrary packet, could cause the
remote target machine to crash.

IV.  Workaround

No workaround is available.  Note that in FreeBSD 10 IPsec is not included
in the kernel by default, but it is in FreeBSD 11.

V.   Solution

Perform one of the following:

1) Upgrade your vulnerable system to a supported FreeBSD stable or
release / security branch (releng) dated after the correction date.

Afterward, reboot the system.

2) To update your vulnerable system via a binary patch:

Systems running a RELEASE version of FreeBSD on the i386 or amd64
platforms can be updated via the freebsd-update(8) utility:

# freebsd-update fetch
# freebsd-update install

Afterward, reboot the system.

3) To update your vulnerable system via a source code patch:

The following patches have been verified to apply to the applicable
FreeBSD release branches.

a) Download the relevant patch from the location below, and verify the
detached PGP signature using your PGP utility.

# fetch https://security.FreeBSD.org/patches/SA-18:05/ipsec.patch
# fetch https://security.FreeBSD.org/patches/SA-18:05/ipsec.patch.asc
# gpg --verify ipsec.patch.asc

b) Apply the patch.  Execute the following commands as root:

# cd /usr/src
# patch < /path/to/patch

c) Recompile your kernel as described in
<URL:https://www.FreeBSD.org/handbook/kernelconfig.html> and reboot the
system.

VI.  Correction details

The following list contains the correction revision numbers for each
affected branch.

Branch/path                                                      Revision
- -------------------------------------------------------------------------
stable/10/                                                        r328621
releng/10.3/                                                      r331985
releng/10.4/                                                      r331985
stable/11/                                                        r328620
releng/11.1/                                                      r331985
- -------------------------------------------------------------------------

To see which files were modified by a particular revision, run the
following command, replacing NNNNNN with the revision number, on a
machine with Subversion installed:

# svn diff -cNNNNNN --summarize svn://svn.freebsd.org/base

Or visit the following URL, replacing NNNNNN with the revision number:

<URL:https://svnweb.freebsd.org/base?view=revision&revision=NNNNNN>

VII. References

<URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-6918>

The latest revision of this advisory is available at
<URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-18:05.ipsec.asc>
-----BEGIN PGP SIGNATURE-----
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=WcBl
-----END PGP SIGNATURE-----
    

- 漏洞信息

FreeBSD CVE-2018-6918 Denial of Service Vulnerability
Failure to Handle Exceptional Conditions 103666
Yes No
2018-04-04 12:00:00 2018-04-04 12:00:00
Maxime Villard

- 受影响的程序版本

FreeBSD Freebsd 11.1-RELEASE-p7
FreeBSD Freebsd 11.1-RELEASE-p4
FreeBSD Freebsd 11.1
FreeBSD Freebsd 10.4-RELEASE-p6
FreeBSD Freebsd 10.4-RELEASE-p3
FreeBSD Freebsd 10.4
FreeBSD Freebsd 10.3-RELEASE-p5
FreeBSD Freebsd 10.3-RELEASE-p4
FreeBSD Freebsd 10.3-RELEASE-p3
FreeBSD Freebsd 10.3-RELEASE-p27
FreeBSD Freebsd 10.3-RELEASE-p24
FreeBSD Freebsd 10.3-RELEASE-p20
FreeBSD Freebsd 10.3-RELEASE-p2
FreeBSD Freebsd 10.3-RELEASE-p19
FreeBSD Freebsd 10.3-RELEASE-p15
FreeBSD Freebsd 10.3-RELEASE-p13
FreeBSD Freebsd 10.3-RELEASE-p1
FreeBSD Freebsd 10.3
,FreeBSD Freebsd 11.1-STABLE
FreeBSD Freebsd 11.1-RELEASE-p9
FreeBSD Freebsd 10.4-STABLE
FreeBSD Freebsd 10.4-RELEASE-p8
FreeBSD Freebsd 10.3-RELEASE-p29

- 不受影响的程序版本

FreeBSD Freebsd 11.1-STABLE
FreeBSD Freebsd 11.1-RELEASE-p9
FreeBSD Freebsd 10.4-STABLE
FreeBSD Freebsd 10.4-RELEASE-p8
FreeBSD Freebsd 10.3-RELEASE-p29

- 漏洞讨论

FreeBSD is prone to a denial-of-service vulnerability.

Attackers can exploit this issue to cause the application to enter an infinite loop which may cause denial-of-service.

- 漏洞利用

Currently, we are not aware of any working exploits. If you feel we are in error or if you are aware of more recent information, please mail us at: vuldb@securityfocus.com.

- 解决方案

Updates are available. Please see the references or vendor advisory for more information.

- 相关参考

 

 

关于SCAP中文社区

SCAP中文社区是国内第一个以SCAP为主题的中文开放社区。了解更多信息,请查阅[关于本站]

版权声明

CVE/CWE/OVAL均为MITRE公司的注册商标,它们的官方数据源均保存在MITRE公司的相关网站