发布日期：2010-01-20
更新日期：2010-01-22

受影响系统：

GNU gzip 1.x

不受影响系统：

GNU gzip 1.4

描述：

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BUGTRAQ  ID: 37886
CVE ID: CVE-2010-0001

gzip是一款非常流行的文件压缩工具。

gzip的unlzw.c文件中的unlzw()函数在解压特制Lempel-Ziv-Welch（LZW）压缩文件时存在整数下溢漏洞，用户受骗将特制的LZW压缩gzip文档解压到本地就会导致gzip崩溃或以当前用户权限执行任意指令。

<*来源：Aki Helin
  
  链接：http://secunia.com/advisories/38220/
        http://www.ubuntu.com/usn/USN-889-1
        https://www.redhat.com/support/errata/RHSA-2010-0061.html
        http://www.debian.org/security/2010/dsa-1974
        http://www.debian.org/security/2010/dsa-2074
*>

建议：

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厂商补丁：

Debian
------
Debian已经为此发布了一个安全公告（DSA-2074-1）以及相应补丁:
DSA-2074-1：ncompress: Execute arbitrary code/commands - Remote with user interaction
链接：http://www.debian.org/security/2010/dsa-2074

补丁下载：
Source archives:

http://security.debian.org/pool/updates/main/n/ncompress/ncompress_4.2.4.2-1+lenny1.dsc
Size/MD5 checksum:     1001 540971822f1077df924611a0795d708c
http://security.debian.org/pool/updates/main/n/ncompress/ncompress_4.2.4.2-1+lenny1.diff.gz
Size/MD5 checksum:     7958 9e1082cc4b82240e9cd76b09f93adebb
http://security.debian.org/pool/updates/main/n/ncompress/ncompress_4.2.4.2.orig.tar.gz
Size/MD5 checksum:    32978 53421df78cc9ff311ce0392e3a729920

alpha architecture (DEC Alpha)

http://security.debian.org/pool/updates/main/n/ncompress/ncompress_4.2.4.2-1+lenny1_alpha.deb
Size/MD5 checksum:    25032 97104b799ed18dda40a495af691097e7

amd64 architecture (AMD x86_64 (AMD64))

http://security.debian.org/pool/updates/main/n/ncompress/ncompress_4.2.4.2-1+lenny1_amd64.deb
Size/MD5 checksum:    24058 ff6531d0a69fd6cffaeb66ef05bc5d53

arm architecture (ARM)

http://security.debian.org/pool/updates/main/n/ncompress/ncompress_4.2.4.2-1+lenny1_arm.deb
Size/MD5 checksum:    23852 7157e843f9066f7d20e07a83cba0b2e1

armel architecture (ARM EABI)

http://security.debian.org/pool/updates/main/n/ncompress/ncompress_4.2.4.2-1+lenny1_armel.deb
Size/MD5 checksum:    23740 d4323cbb9d5938850b71514f1edd5ca0

hppa architecture (HP PA RISC)

http://security.debian.org/pool/updates/main/n/ncompress/ncompress_4.2.4.2-1+lenny1_hppa.deb
Size/MD5 checksum:    25466 b276a1839ad20d5dc675a119c76e66e5

i386 architecture (Intel ia32)

http://security.debian.org/pool/updates/main/n/ncompress/ncompress_4.2.4.2-1+lenny1_i386.deb
Size/MD5 checksum:    23076 a53008254138090e760ec7a51d551bee

ia64 architecture (Intel ia64)

http://security.debian.org/pool/updates/main/n/ncompress/ncompress_4.2.4.2-1+lenny1_ia64.deb
Size/MD5 checksum:    28200 a2736fb1efd14e676ac6a2cb1ec3da46

mips architecture (MIPS (Big Endian))

http://security.debian.org/pool/updates/main/n/ncompress/ncompress_4.2.4.2-1+lenny1_mips.deb
Size/MD5 checksum:    24106 0b3cf882744400648ddefa54111ae540

mipsel architecture (MIPS (Little Endian))

http://security.debian.org/pool/updates/main/n/ncompress/ncompress_4.2.4.2-1+lenny1_mipsel.deb
Size/MD5 checksum:    24204 8c85696714487268c4bf0adb0a9d31b9

powerpc architecture (PowerPC)

http://security.debian.org/pool/updates/main/n/ncompress/ncompress_4.2.4.2-1+lenny1_powerpc.deb
Size/MD5 checksum:    24476 98db6645c581ccd5cf35a8ca0ea28966

s390 architecture (IBM S/390)

http://security.debian.org/pool/updates/main/n/ncompress/ncompress_4.2.4.2-1+lenny1_s390.deb
Size/MD5 checksum:    23944 9e40760b9cfbe73ceb6180da37175892

sparc architecture (Sun SPARC/UltraSPARC)

http://security.debian.org/pool/updates/main/n/ncompress/ncompress_4.2.4.2-1+lenny1_sparc.deb
Size/MD5 checksum:    23860 a422335c694163587222691d9fa728ac

补丁安装方法：

1. 手工安装补丁包：

  首先，使用下面的命令来下载补丁软件：
  # wget url  (url是补丁下载链接地址)

  然后，使用下面的命令来安装补丁：  
  # dpkg -i file.deb (file是相应的补丁名)

2. 使用apt-get自动安装补丁包：

   首先，使用下面的命令更新内部数据库：
   # apt-get update
  
   然后，使用下面的命令安装更新软件包：
   # apt-get upgrade

GNU
---
目前厂商已经发布了升级补丁以修复这个安全问题，请到厂商的主页下载：

http://savannah.gnu.org/forum/forum.php?forum_id=6153
http://git.savannah.gnu.org/cgit/gzip.git/commit/?id=a3db5806d012082b9e25cc36d09f19cd736a468f

RedHat
------
RedHat已经为此发布了一个安全公告（RHSA-2010:0061-02）以及相应补丁:
RHSA-2010:0061-02：Moderate: gzip security update
链接：https://www.redhat.com/support/errata/RHSA-2010-0061.html

Ubuntu
------
Ubuntu已经为此发布了一个安全公告（USN-889-1）以及相应补丁:
USN-889-1：gzip vulnerabilities
链接：http://www.ubuntu.com/usn/USN-889-1

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