发布时间 :2005-05-02 00:00:00
修订时间 :2008-09-10 15:34:52

[原文]Buffer overflow in xtrlock 2.0 allows local users to cause a denial of service (application crash) and hijack the desktop session.


        xtrlock 2.0中存在缓冲区溢出漏洞,允许本地用户引起拒绝服务(应用程序崩溃)攻击以及劫持桌面会话。

- 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)


- OVAL (用于检测的技术细节)


- 官方数据库链接
(官方数据源) MITRE
(官方数据源) NVD
(官方数据源) CNNVD

- 其它链接及资源
(UNKNOWN)  XF  xtrlock-screen-lock-bypass(18991)
(UNKNOWN)  BID  12316

- 漏洞信息

中危 缓冲区溢出
2005-05-02 00:00:00 2005-10-20 00:00:00
        xtrlock 2.0中存在缓冲区溢出漏洞,允许本地用户引起拒绝服务(应用程序崩溃)攻击以及劫持桌面会话。

- 公告与补丁


- 漏洞信息 (F35842)

dsa-649.txt (PacketStormID:F35842)
2005-01-25 00:00:00

Debian Security Advisory 649-1 - A buffer overflow has been discovered in xtrlock, a minimal X display lock program which can be exploited by a malicious local attacker to crash the lock program and take over the desktop session.

Hash: SHA1

- --------------------------------------------------------------------------
Debian Security Advisory DSA 649-1                                        Martin Schulze
January 20th, 2005            
- --------------------------------------------------------------------------

Package        : xtrlock
Vulnerability  : buffer overflow
Problem-Type   : local
Debian-specific: no
CVE ID         : CAN-2005-0079
Debian Bug     : 278190 278191

A buffer overflow has been discovered in xtrlock, a minimal X display
lock program which can be exploited by a malicious local attacker to
crash the lock program and take over the desktop session.

For the stable distribution (woody) this problem has been fixed in
version 2.0-6woody2.

For the unstable distribution (sid) this problem has been fixed in
version 2.0-9.

We recommend that you upgrade your xtrlock package.

Upgrade Instructions
- --------------------

wget url
        will fetch the file for you
dpkg -i file.deb
        will install the referenced file.

If you are using the apt-get package manager, use the line for
sources.list as given below:

apt-get update
        will update the internal database
apt-get upgrade
        will install corrected packages

You may use an automated update by adding the resources from the
footer to the proper configuration.

Debian GNU/Linux 3.0 alias woody
- --------------------------------

  Source archives:
      Size/MD5 checksum:      500 d39ea1ae4ee66338786d018406065022
      Size/MD5 checksum:     6977 6e6cfc0627bb74bd5014b550c2ea7a5f

  Alpha architecture:
      Size/MD5 checksum:     9604 d05e56b7856e770b1b43daaf43a0dc3d

  ARM architecture:
      Size/MD5 checksum:     8604 f0d46d569f47ecb8a138c9f91be6cdc6

  Intel IA-32 architecture:
      Size/MD5 checksum:     8730 63b6233b95553ffa59de4811c06a6502

  Intel IA-64 architecture:
      Size/MD5 checksum:    10104 ab12fc340b57cb3cbd58cbb0e6e1c188

  HP Precision architecture:
      Size/MD5 checksum:     8988 cd59712f225ec6d790ad608a8c0dac3a

  Motorola 680x0 architecture:
      Size/MD5 checksum:     8606 abac92671aefe845c7fd609668a9f367

  Big endian MIPS architecture:
      Size/MD5 checksum:     8830 1a09a3a4e99e8c5f94a555ad8f9fc0c0

  Little endian MIPS architecture:
      Size/MD5 checksum:     8828 7f56d17dd068abe7cb99a47f2e328fc9

  PowerPC architecture:
      Size/MD5 checksum:     8636 cd7dfdba990035bc942e1c16844eefcd

  IBM S/390 architecture:
      Size/MD5 checksum:     9128 f85ab602c4160b29bdb98170114b2368

  Sun Sparc architecture:
      Size/MD5 checksum:    11340 c5b11b174068e3b0ebc61aa5f6cf9412

  These files will probably be moved into the stable distribution on
  its next update.

- ---------------------------------------------------------------------------------
For apt-get: deb stable/updates main
For dpkg-ftp: dists/stable/updates/main
Mailing list:
Package info: `apt-cache show <pkg>' and<pkg>

Version: GnuPG v1.2.5 (GNU/Linux)



- 漏洞信息

xtrlock Crash Screen Lock Bypass
Physical Access Required Input Manipulation
Loss of Integrity
Exploit Public Vendor Verified

- 漏洞描述

A local overflow exists in the xtrlock program. The xtrlock screen-lock program fails to buffer a long string of characters resulting in a buffer overflow. With a specially crafted request, an attacker can cause the program to crash resulting in access to the system and a loss of integrity.

- 时间线

2005-01-20 2004-10-25
2005-01-20 Unknow

- 解决方案

If using Debian 3.0 stable, upgrade to xtrlock version 2.0-6woody2 or higher or if using Debian 3.0 unstable, upgrade to xtrlock version version 2.0-9 or higher, as it has been reported to fix this vulnerability. An upgrade is required as there are no known workarounds.

- 相关参考

- 漏洞作者

- 漏洞信息

xtrlock Unspecified Local Buffer Overflow Vulnerability
Boundary Condition Error 12316
No Yes
2005-01-20 12:00:00 2009-07-12 10:06:00
This issue was disclosed in a Debian advisory.

- 受影响的程序版本

xtrlock xtrlock 2.0
+ Debian Linux 3.0 sparc
+ Debian Linux 3.0 s/390
+ Debian Linux 3.0 ppc
+ Debian Linux 3.0 mipsel
+ Debian Linux 3.0 mips
+ Debian Linux 3.0 m68k
+ Debian Linux 3.0 ia-64
+ Debian Linux 3.0 ia-32
+ Debian Linux 3.0 hppa
+ Debian Linux 3.0 arm
+ Debian Linux 3.0 alpha
+ Debian Linux 3.0

- 漏洞讨论

xtrlock is reported prone to an unspecified local buffer overflow vulnerability. This issue exists due to insufficient boundary checks performed by the application when copying user-supplied data in to process buffers.

xtrlock is likely to be executed with superuser privileges, allowing the attacker to gain elevated privileges.

Due to a lack of information, further details cannot be provided at the moment. This BID will be updated when more information is available.

- 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: &lt;;.

- 解决方案

Debian has released advisory DSA 649-1 to address this issue. Please see the referenced advisory for more information.

xtrlock xtrlock 2.0

- 相关参考