CVE-2018-6916
CVSS9.0
发布时间 :2018-03-09 10:29:00
修订时间 :2018-03-29 10:03:17
NMP    

[原文]In FreeBSD before 11.1-STABLE, 11.1-RELEASE-p7, 10.4-STABLE, 10.4-RELEASE-p7, and 10.3-RELEASE-p28, the kernel does not properly validate IPsec packets coming from a trusted host. Additionally, a use-after-free vulnerability exists in the IPsec AH handling code. This issue could cause a system crash or other unpredictable results.


[CNNVD]CNNVD数据暂缺。


[机译]译文暂缺.

- CVSS (基础分值)

CVSS分值: 9 [严重(HIGH)]
机密性影响: PARTIAL [很可能造成信息泄露]
完整性影响: PARTIAL [可能会导致系统文件被修改]
可用性影响: COMPLETE [可能导致系统完全宕机]
攻击复杂度: LOW [漏洞利用没有访问限制 ]
攻击向量: NETWORK [攻击者不需要获取内网访问权或本地访问权]
身份认证: NONE [漏洞利用无需身份认证]

- CWE (弱点类目)

CWE-416 [释放后使用]

- CPE (受影响的平台与产品)

cpe:/o:freebsd:freebsd:10.3:p28
cpe:/o:freebsd:freebsd:10.4
cpe:/o:freebsd:freebsd:10.4:p7

- 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-2018-6916
(官方数据源) MITRE
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-6916
(官方数据源) NVD

- 其它链接及资源

http://www.securitytracker.com/id/1040460
(VENDOR_ADVISORY)  SECTRACK  1040460
https://www.freebsd.org/security/advisories/FreeBSD-SA-18:01.ipsec.asc
(VENDOR_ADVISORY)  FREEBSD  FreeBSD-SA-18:01

- 漏洞信息 (F146700)

FreeBSD Security Advisory - FreeBSD-SA-18:01.ipsec Revised (PacketStormID:F146700)
2018-03-08 00:00:00
Maxime Villard  security.freebsd.org
advisory,kernel
freebsd
CVE-2018-6916
[点击下载]

FreeBSD Security Advisory - Due to a lack of strict checking, an attacker from a trusted host can send a specially constructed IP packet that may lead to a system crash. Additionally, a use-after-free vulnerability in the AH handling code could cause unpredictable results. Access to out of bounds or freed mbuf data can lead to a kernel panic or other unpredictable results.

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

=============================================================================
FreeBSD-SA-18:01.ipsec [REVISED]                            Security Advisory
                                                          The FreeBSD Project

Topic:          ipsec validation and use-after-free

Category:       core
Module:         ipsec
Announced:      2018-03-07
Credits:        Maxime Villard
Affects:        All supported versions of FreeBSD.
Corrected:      2018-02-24 13:04:02 UTC (stable/11, 11.1-STABLE)
                2018-03-07 05:53:35 UTC (releng/11.1, 11.1-RELEASE-p7)
                2018-03-07 16:55:15 UTC (stable/10, 10.4-STABLE)
                2018-03-07 17:16:41 UTC (releng/10.4, 10.4-RELEASE-p7)
                2018-03-07 17:16:41 UTC (releng/10.3, 10.3-RELEASE-p28)
CVE Name:       CVE-2018-6916

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/>.

0.   Revision History

v1.0  2018-03-07 Initial release.
v1.1  2018-03-08 Correct patch for 10.x releases.

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

Due to a lack of strict checking, an attacker from a trusted host can
send a specially constructed IP packet that may lead to a system crash.

Additionally, a use-after-free vulnerability in the AH handling code could
cause unpredictable results.

III. Impact

Access to out of bounds or freed mbuf data can lead to a kernel panic or
other unpredictable results.

IV.  Workaround

No workaround is available, but systems not using IPsec are not vulnerable.

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.
And 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
And 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.

[*** v1.1 NOTE ***] If your 10.x sources were already patched using the
initially published advisory patches, you need to apply the
ipsec-10.rev1.patch. If you had not yet patched your 10.x sources, you need
only apply the ipsec-10.patch file. 11.1 sources were correct in the initial
release and do not need to be updated.

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

[FreeBSD 10.x system not patched with the original SA-18:01 patch]
# fetch https://security.FreeBSD.org/patches/SA-18:01/ipsec-10.patch
# fetch https://security.FreeBSD.org/patches/SA-18:01/ipsec-10.patch.asc
# gpg --verify ipsec-10.patch.asc

[FreeBSD 10.x that had been patched with the original SA-18:01 patch]
# fetch https://security.FreeBSD.org/patches/SA-18:01/ipsec-10.rev1.patch
# fetch https://security.FreeBSD.org/patches/SA-18:01/ipsec-10.rev1.patch.asc
# gpg --verify ipsec-10.rev1.patch.asc

[FreeBSD 11.1]
# fetch https://security.FreeBSD.org/patches/SA-18:01/ipsec-11.patch
# fetch https://security.FreeBSD.org/patches/SA-18:01/ipsec-11.patch.asc
# gpg --verify ipsec-11.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/                                                        r330609
releng/10.3/                                                      r330611
releng/10.4/                                                      r330611
stable/11/                                                        r329907
releng/11.1/                                                      r330566
- -------------------------------------------------------------------------

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-2018-6916>

The latest revision of this advisory is available at
<URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-18:01.ipsec.asc>
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