CVE-2004-0919
CVSS4.6
发布时间 :2004-12-31 00:00:00
修订时间 :2008-09-05 16:39:47
NMCOPS    

[原文]The syscons CONS_SCRSHOT ioctl in FreeBSD 5.x allows local users to read arbitrary kernel memory via (1) negative coordinates or (2) large coordinates.


[CNNVD]FreeBSD Syscons CONS_SCRSHOT内核内存泄露漏洞(CNNVD-200412-826)

        
        FreeBSD是一款免费开放源代码的UNIX操作系统。
        FreeBSD syscons驱动存在内存泄露问题,本地攻击者可以利用这个漏洞获得敏感信息。
        syscons(4)是FreeBSD的默认控制台驱动,使用物理键盘和屏幕。syscons CONS_SCRSHOT ioctl(2)对参数输入验证不充分,可导致CONS_SCRSHOT ioctl返回部分内核内存信息。这些信息包括文件缓存或终端缓存。攻击者可以利用这些信息获得敏感资料,如用户密码。
        

- CVSS (基础分值)

CVSS分值: 4.6 [中等(MEDIUM)]
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: PARTIAL [可能会导致性能下降或中断资源访问]
攻击复杂度: LOW [漏洞利用没有访问限制 ]
攻击向量: LOCAL [漏洞利用需要具有物理访问权限或本地帐户]
身份认证: NONE [漏洞利用无需身份认证]

- CPE (受影响的平台与产品)

cpe:/o:freebsd:freebsd:5.1FreeBSD 5.1
cpe:/o:freebsd:freebsd:5.1:alpha
cpe:/o:freebsd:freebsd:5.0:release_p14
cpe:/o:freebsd:freebsd:5.1:release_p5
cpe:/o:freebsd:freebsd:5.2.1:release
cpe:/o:freebsd:freebsd:5.2.1:releng
cpe:/o:freebsd:freebsd:5.0FreeBSD 5.0
cpe:/o:freebsd:freebsd:5.1:releng
cpe:/o:freebsd:freebsd:5.1:release
cpe:/o:freebsd:freebsd:5.0:releng
cpe:/o:freebsd:freebsd:5.2FreeBSD 5.2
cpe:/o:freebsd:freebsd:5.0:alpha

- 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-2004-0919
(官方数据源) MITRE
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2004-0919
(官方数据源) NVD
http://www.cnnvd.org.cn/vulnerability/show/cv_cnnvdid/CNNVD-200412-826
(官方数据源) CNNVD

- 其它链接及资源

http://www.kb.cert.org/vuls/id/969078
(VENDOR_ADVISORY)  CERT-VN  VU#969078
http://www.securityfocus.com/bid/11321
(PATCH)  BID  11321
http://secunia.com/advisories/12722
(PATCH)  SECUNIA  12722
ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-04:15.syscons.asc
(PATCH)  FREEBSD  FreeBSD-SA-04:15
http://xforce.iss.net/xforce/xfdb/17584
(UNKNOWN)  XF  syscons-consscrshot-info-disclosure(17584)

- 漏洞信息

FreeBSD Syscons CONS_SCRSHOT内核内存泄露漏洞
中危 设计错误
2004-12-31 00:00:00 2005-10-20 00:00:00
本地  
        
        FreeBSD是一款免费开放源代码的UNIX操作系统。
        FreeBSD syscons驱动存在内存泄露问题,本地攻击者可以利用这个漏洞获得敏感信息。
        syscons(4)是FreeBSD的默认控制台驱动,使用物理键盘和屏幕。syscons CONS_SCRSHOT ioctl(2)对参数输入验证不充分,可导致CONS_SCRSHOT ioctl返回部分内核内存信息。这些信息包括文件缓存或终端缓存。攻击者可以利用这些信息获得敏感资料,如用户密码。
        

- 公告与补丁

        厂商补丁:
        FreeBSD
        -------
        FreeBSD已经为此发布了一个安全公告(FreeBSD-SA-04:15)以及相应补丁:
        FreeBSD-SA-04:15:Boundary checking errors in syscons
        链接:ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-04:15.syscons.asc
        补丁下载:
        # fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-04:15/syscons.patch
        # fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-04:15/syscons.patch.asc
        或升级到RELENG_5_2安全分支。

- 漏洞信息 (F34580)

FreeBSD Security Advisory 2004.15 (PacketStormID:F34580)
2004-10-13 00:00:00
The FreeBSD Project,Christer Oberg  freebsd.org
advisory
freebsd
CVE-2004-0919
[点击下载]

FreeBSD Security Advisory FreeBSD-SA-04:15.syscons - The syscons CONS_SCRSHOT ioctl(2) does insufficient validation of its input arguments. In particular, negative coordinates or large coordinates may cause unexpected behavior.

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    <div class="h1"><h1>FreeBSD Security Advisory 2004.15</h1></div>
<dl id="F34580" class="file first">
<dt><a class="ico text-plain" href="/files/download/34580/FreeBSD-SA-04%3A15.syscons.txt" title="Size: 3.5 KB"><strong>FreeBSD Security Advisory 2004.15</strong></a></dt>
<dd class="datetime">Posted <a href="/files/date/2004-10-13/" title="03:33:23 UTC">Oct 13, 2004</a></dd>
<dd class="refer">Authored by <a href="/files/author/1243/" class="group">The FreeBSD Project</a>, <a href="/files/author/2924/" class="person">Christer Oberg</a> | Site <a href="http://www.freebsd.org/security/">freebsd.org</a></dd>
<dd class="detail"><p>FreeBSD Security Advisory FreeBSD-SA-04:15.syscons - The syscons CONS_SCRSHOT ioctl(2) does insufficient validation of its input arguments. In particular, negative coordinates or large coordinates may cause unexpected behavior.</p></dd>
<dd class="tags"><span>tags</span> | <a href="/files/tags/advisory">advisory</a></dd>
<dd class="os"><span>systems</span> | <a href="/files/os/freebsd">freebsd</a></dd>
<dd class="cve"><span>advisories</span> | <a href="/files/cve/CVE-2004-0919">CVE-2004-0919</a></dd>
<dd class="md5"><span>MD5</span> | <code>181ac2612ef0976b5adf64eaa7cee8c4</code></dd>
<dd class="act-links"><a href="/files/download/34580/FreeBSD-SA-04%3A15.syscons.txt" title="Size: 3.5 KB" rel="nofollow">Download</a> | <a href="/files/favorite/34580/" class="fav" rel="nofollow">Favorite</a> | <a href="/files/34580/FreeBSD-Security-Advisory-2004.15.html">Comments <span>(0)</span></a></dd>
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<pre><code>-----BEGIN PGP SIGNED MESSAGE-----<br />Hash: SHA1<br /><br />=============================================================================<br />FreeBSD-SA-04:15.syscons                                    Security Advisory<br />                                                          The FreeBSD Project<br /><br />Topic:          Boundary checking errors in syscons<br /><br />Category:       core<br />Module:         sys_dev_syscons<br />Announced:      2004-10-04<br />Credits:        Christer Oberg<br />Affects:        FreeBSD 5.x releases<br />Corrected:      2004-09-30 17:49:15 UTC (RELENG_5, 5.3-BETA6)<br />                2004-10-04 17:04:25 UTC (RELENG_5_2, 5.2.1-RELEASE-p11)<br />CVE Name:       CAN-2004-0919<br />FreeBSD only:   YES<br /><br />For general information regarding FreeBSD Security Advisories,<br />including descriptions of the fields above, security branches, and the<br />following sections, please visit<br /><URL:http://www.freebsd.org/security/>.<br /><br />I.   Background<br /><br />syscons(4) is the default console driver for FreeBSD.  Using the<br />physical keyboard and screen, it provides multiple virtual terminals<br />which appear as if they were separate terminals.  One virtual terminal<br />is considered current and exclusively occupies the screen and the<br />keyboard; the other virtual terminals are placed in the background.<br /><br />II.  Problem Description<br /><br />The syscons CONS_SCRSHOT ioctl(2) does insufficient validation of<br />its input arguments.  In particular, negative coordinates or large<br />coordinates may cause unexpected behavior.<br /><br />III. Impact<br /><br />It may be possible to cause the CONS_SCRSHOT ioctl to return portions of<br />kernel memory.  Such memory might contain sensitive information, such as<br />portions of the file cache or terminal buffers.  This information might<br />be directly useful, or it might be leveraged to obtain elevated<br />privileges in some way.  For example, a terminal buffer might include a<br />user-entered password.<br /><br />IV.  Workaround<br /><br />There is no known workaround.  However, this bug is only exploitable<br />by users who have access to the physical console or can otherwise open<br />a /dev/ttyv* device node.<br /><br />V.   Solution<br /><br />Perform one of the following:<br /><br />1) Upgrade your vulnerable system to the RELENG_5_2 security branch<br />dated after the correction date.<br /><br />2) To patch your present system:<br /><br />The following patches have been verified to apply to FreeBSD 5.2<br />systems.<br /><br />a) Download the relevant patch from the location below, and verify the<br />detached PGP signature using your PGP utility.<br /><br /># fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-04:15/syscons.patch<br /># fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-04:15/syscons.patch.asc<br /><br />b) Apply the patch.<br /><br /># cd /usr/src<br /># patch < /path/to/patch<br /><br />c) Recompile your kernel as described in<br /><URL:http://www.freebsd.org/handbook/kernelconfig.html> and reboot the<br />system.<br /><br />VI.  Correction details<br /><br />The following list contains the revision numbers of each file that was<br />corrected in FreeBSD.<br /><br />Branch                                                           Revision<br />  Path<br />- -------------------------------------------------------------------------<br />RELENG_5_2<br />  src/UPDATING                                                 1.282.2.19<br />  src/sys/conf/newvers.sh                                       1.56.2.18<br />  src/sys/dev/syscons/syscons.c                                 1.409.2.1<br />- -------------------------------------------------------------------------<br /><br />VII. References<br /><br /><URL:http://cvsweb.freebsd.org/src/sys/dev/syscons/syscons.c.diff?r1=1.428&r2=1.429><br />-----BEGIN PGP SIGNATURE-----<br />Version: GnuPG v1.2.6 (FreeBSD)<br /><br />iD8DBQFBYYMTFdaIBMps37IRAuNbAJ4jbPnqo3vvEeD33ItW09r3zAuh5QCghq5v<br />SN4Y+OCpzJ7Szy3s++slzeQ=<br />=FlYi<br />-----END PGP SIGNATURE-----<br /></code></pre>
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- 漏洞信息

10487
FreeBSD syscons Kernel Memory Disclosure
Local Access Required Information Disclosure
Loss of Confidentiality
Exploit Unknown

- 漏洞描述

syscons contains a flaw that may lead to an unauthorized information disclosure. The issue is triggered when negative coordinates or large coordinates are submitted to syscons, which will disclose kernel memory information resulting in a loss of confidentiality.

- 时间线

2004-10-04 2004-09-30
Unknow Unknow

- 解决方案

Currently, there are no known workarounds or upgrades to correct this issue. However, FreeBSD Project has released a patch to address this vulnerability.

- 相关参考

- 漏洞作者

- 漏洞信息

FreeBSD Syscons CONS_SCRSHOT Kernel Memory Disclosure Vulnerability
Design Error 11321
No Yes
2004-10-04 12:00:00 2009-07-12 07:06:00
Discovery of this vulnerability is credited to Christer Oberg.

- 受影响的程序版本

FreeBSD FreeBSD 5.2.1 -RELEASE
FreeBSD FreeBSD 5.2 -RELENG
FreeBSD FreeBSD 5.2 -RELEASE
FreeBSD FreeBSD 5.2
FreeBSD FreeBSD 5.1 -RELENG
FreeBSD FreeBSD 5.1 -RELEASE/Alpha
FreeBSD FreeBSD 5.1 -RELEASE-p5
FreeBSD FreeBSD 5.1 -RELEASE
FreeBSD FreeBSD 5.1
FreeBSD FreeBSD 5.0 -RELENG
FreeBSD FreeBSD 5.0 -RELEASE-p14
FreeBSD FreeBSD 5.0 alpha
FreeBSD FreeBSD 5.0

- 漏洞讨论

It is reported that it is possible to trigger a memory disclosure vulnerability in the FreeBSD syscons driver.

An attacker may leverage this issue to read portions of kernel memory. This could allow an attacker to read sensitive data such as a file cache or terminal buffers that may contain a password. Data harvested through exploiting this vulnerability may be used to aid in further attacks launched against the affected computer.

- 漏洞利用

Currently we are not aware of any exploits for this issue. If you feel we are in error or are aware of more recent information, please mail us at: vuldb@securityfocus.com &lt;mailto:vuldb@securityfocus.com&gt;.

- 解决方案

The vendor has released an advisory (FreeBSD-SA-04:15.syscons) and patches to address this vulnerability. Please see the referenced advisory for further details regarding obtaining and applying appropriate patches.


FreeBSD FreeBSD 5.0 -RELENG

FreeBSD FreeBSD 5.0

FreeBSD FreeBSD 5.0 alpha

FreeBSD FreeBSD 5.0 -RELEASE-p14

FreeBSD FreeBSD 5.1 -RELEASE

FreeBSD FreeBSD 5.1

FreeBSD FreeBSD 5.1 -RELENG

FreeBSD FreeBSD 5.1 -RELEASE-p5

FreeBSD FreeBSD 5.1 -RELEASE/Alpha

FreeBSD FreeBSD 5.2 -RELENG

FreeBSD FreeBSD 5.2 -RELEASE

FreeBSD FreeBSD 5.2

FreeBSD FreeBSD 5.2.1 -RELEASE

- 相关参考

 

 

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