## https://sploitus.com/exploit?id=SSV:3910
BUGTRAQ ID: 30783
CVE(CAN) ID: CVE-2008-3281
libxml2软件包提供允许用户操控XML文件的函数库，包含有读、修改和写XML和HTML文件支持。
libxml2库在解析某些XML内容时没有正确地检查递归深度，使用Libxml2库的应用程序在处理特制XML文档时可能会耗尽所有可用的内存和CPU资源。
XMLSoft Libxml2 2.6.x
厂商补丁：
Debian
------
Debian已经为此发布了一个安全公告（DSA-1631-1）以及相应补丁:
DSA-1631-1：New libxml2 packages fix denial of service
链接：<a href=http://www.debian.org/security/2008/dsa-1631 target=_blank>http://www.debian.org/security/2008/dsa-1631</a>
补丁下载：
Source archives:
<a href=http://security.debian.org/pool/updates/main/libx/libxml2/libxml2_2.6.27.dfsg.orig.tar.gz target=_blank>http://security.debian.org/pool/updates/main/libx/libxml2/libxml2_2.6.27.dfsg.orig.tar.gz</a>
Size/MD5 checksum: 3416175 5ff71b22f6253a6dd9afc1c34778dec3
<a href=http://security.debian.org/pool/updates/main/libx/libxml2/libxml2_2.6.27.dfsg-3.dsc target=_blank>http://security.debian.org/pool/updates/main/libx/libxml2/libxml2_2.6.27.dfsg-3.dsc</a>
Size/MD5 checksum: 901 800082d165a5627f571f019994bee93c
<a href=http://security.debian.org/pool/updates/main/libx/libxml2/libxml2_2.6.27.dfsg-3.diff.gz target=_blank>http://security.debian.org/pool/updates/main/libx/libxml2/libxml2_2.6.27.dfsg-3.diff.gz</a>
Size/MD5 checksum: 146017 10fc8479d96fb23d17ac8a51bfe40db9
Architecture independent packages:
<a href=http://security.debian.org/pool/updates/main/libx/libxml2/libxml2-doc_2.6.27.dfsg-3_all.deb target=_blank>http://security.debian.org/pool/updates/main/libx/libxml2/libxml2-doc_2.6.27.dfsg-3_all.deb</a>
Size/MD5 checksum: 1325318 11e64cd82ae7b549fa975a657f773f73
alpha architecture (DEC Alpha)
<a href=http://security.debian.org/pool/updates/main/libx/libxml2/libxml2-utils_2.6.27.dfsg-3_alpha.deb target=_blank>http://security.debian.org/pool/updates/main/libx/libxml2/libxml2-utils_2.6.27.dfsg-3_alpha.deb</a>
Size/MD5 checksum: 37976 909bab48a2b4a6c29e11b8b880dd464d
<a href=http://security.debian.org/pool/updates/main/libx/libxml2/python-libxml2_2.6.27.dfsg-3_alpha.deb target=_blank>http://security.debian.org/pool/updates/main/libx/libxml2/python-libxml2_2.6.27.dfsg-3_alpha.deb</a>
Size/MD5 checksum: 184758 2dbe0e48211dff90726296ee6786b73b
<a href=http://security.debian.org/pool/updates/main/libx/libxml2/libxml2-dbg_2.6.27.dfsg-3_alpha.deb target=_blank>http://security.debian.org/pool/updates/main/libx/libxml2/libxml2-dbg_2.6.27.dfsg-3_alpha.deb</a>
Size/MD5 checksum: 881704 110adb2bde79f8feb121beaa9ae8e15d
<a href=http://security.debian.org/pool/updates/main/libx/libxml2/libxml2-dev_2.6.27.dfsg-3_alpha.deb target=_blank>http://security.debian.org/pool/updates/main/libx/libxml2/libxml2-dev_2.6.27.dfsg-3_alpha.deb</a>
Size/MD5 checksum: 916192 fd97550bc89ee18ef4c58da00b2c8b1c
<a href=http://security.debian.org/pool/updates/main/libx/libxml2/libxml2_2.6.27.dfsg-3_alpha.deb target=_blank>http://security.debian.org/pool/updates/main/libx/libxml2/libxml2_2.6.27.dfsg-3_alpha.deb</a>
Size/MD5 checksum: 820740 47ba8095722f2bbdf6e88fa6881b365e
amd64 architecture (AMD x86_64 (AMD64))
<a href=http://security.debian.org/pool/updates/main/libx/libxml2/libxml2-utils_2.6.27.dfsg-3_amd64.deb target=_blank>http://security.debian.org/pool/updates/main/libx/libxml2/libxml2-utils_2.6.27.dfsg-3_amd64.deb</a>
Size/MD5 checksum: 36774 78fbbff7c5a940d516ddab2145af3a04
<a href=http://security.debian.org/pool/updates/main/libx/libxml2/libxml2-dbg_2.6.27.dfsg-3_amd64.deb target=_blank>http://security.debian.org/pool/updates/main/libx/libxml2/libxml2-dbg_2.6.27.dfsg-3_amd64.deb</a>
Size/MD5 checksum: 891114 54574b53e6e1d243c9a3a8db7a7ff845
<a href=http://security.debian.org/pool/updates/main/libx/libxml2/python-libxml2_2.6.27.dfsg-3_amd64.deb target=_blank>http://security.debian.org/pool/updates/main/libx/libxml2/python-libxml2_2.6.27.dfsg-3_amd64.deb</a>
Size/MD5 checksum: 182908 28cfebcd7ab010cf63e9261147be9806
<a href=http://security.debian.org/pool/updates/main/libx/libxml2/libxml2-dev_2.6.27.dfsg-3_amd64.deb target=_blank>http://security.debian.org/pool/updates/main/libx/libxml2/libxml2-dev_2.6.27.dfsg-3_amd64.deb</a>
Size/MD5 checksum: 746356 96ee63f89da370e08d4d7cf2d656c414
<a href=http://security.debian.org/pool/updates/main/libx/libxml2/libxml2_2.6.27.dfsg-3_amd64.deb target=_blank>http://security.debian.org/pool/updates/main/libx/libxml2/libxml2_2.6.27.dfsg-3_amd64.deb</a>
Size/MD5 checksum: 796450 d9e1bc7ac6e9ac08a50e4cc7fd245433
arm architecture (ARM)
<a href=http://security.debian.org/pool/updates/main/libx/libxml2/libxml2-dev_2.6.27.dfsg-3_arm.deb target=_blank>http://security.debian.org/pool/updates/main/libx/libxml2/libxml2-dev_2.6.27.dfsg-3_arm.deb</a>
Size/MD5 checksum: 672716 21723fdd5875eb16170ec69734fa4cd4
<a href=http://security.debian.org/pool/updates/main/libx/libxml2/python-libxml2_2.6.27.dfsg-3_arm.deb target=_blank>http://security.debian.org/pool/updates/main/libx/libxml2/python-libxml2_2.6.27.dfsg-3_arm.deb</a>
Size/MD5 checksum: 165296 091714fdcb9c7c7909496ac14d9af71d
<a href=http://security.debian.org/pool/updates/main/libx/libxml2/libxml2-utils_2.6.27.dfsg-3_arm.deb target=_blank>http://security.debian.org/pool/updates/main/libx/libxml2/libxml2-utils_2.6.27.dfsg-3_arm.deb</a>
Size/MD5 checksum: 34676 d1acb4cd2a7036e35a7cfbcdc25362b7
<a href=http://security.debian.org/pool/updates/main/libx/libxml2/libxml2-dbg_2.6.27.dfsg-3_arm.deb target=_blank>http://security.debian.org/pool/updates/main/libx/libxml2/libxml2-dbg_2.6.27.dfsg-3_arm.deb</a>
Size/MD5 checksum: 816944 102757770541cb1d1336bb4d3c086aa8
<a href=http://security.debian.org/pool/updates/main/libx/libxml2/libxml2_2.6.27.dfsg-3_arm.deb target=_blank>http://security.debian.org/pool/updates/main/libx/libxml2/libxml2_2.6.27.dfsg-3_arm.deb</a>
Size/MD5 checksum: 741122 35af939918be6655ca6994462a3b9610
hppa architecture (HP PA RISC)
<a href=http://security.debian.org/pool/updates/main/libx/libxml2/python-libxml2_2.6.27.dfsg-3_hppa.deb target=_blank>http://security.debian.org/pool/updates/main/libx/libxml2/python-libxml2_2.6.27.dfsg-3_hppa.deb</a>
Size/MD5 checksum: 192856 0f670bcbefb06ace1dcd643e4045d5ce
<a href=http://security.debian.org/pool/updates/main/libx/libxml2/libxml2-dev_2.6.27.dfsg-3_hppa.deb target=_blank>http://security.debian.org/pool/updates/main/libx/libxml2/libxml2-dev_2.6.27.dfsg-3_hppa.deb</a>
Size/MD5 checksum: 857960 cc1632c8c04e9582e79e46729ce6657b
<a href=http://security.debian.org/pool/updates/main/libx/libxml2/libxml2-utils_2.6.27.dfsg-3_hppa.deb target=_blank>http://security.debian.org/pool/updates/main/libx/libxml2/libxml2-utils_2.6.27.dfsg-3_hppa.deb</a>
Size/MD5 checksum: 36856 35450be2eee5c16c4ac8b230b8d67de5
<a href=http://security.debian.org/pool/updates/main/libx/libxml2/libxml2-dbg_2.6.27.dfsg-3_hppa.deb target=_blank>http://security.debian.org/pool/updates/main/libx/libxml2/libxml2-dbg_2.6.27.dfsg-3_hppa.deb</a>
Size/MD5 checksum: 863890 fd6b47e9995c8150fe0d42036de52b92
<a href=http://security.debian.org/pool/updates/main/libx/libxml2/libxml2_2.6.27.dfsg-3_hppa.deb target=_blank>http://security.debian.org/pool/updates/main/libx/libxml2/libxml2_2.6.27.dfsg-3_hppa.deb</a>
Size/MD5 checksum: 849758 3199a4ab9ce81877235f78c611f0ae4e
i386 architecture (Intel ia32)
<a href=http://security.debian.org/pool/updates/main/libx/libxml2/libxml2-dbg_2.6.27.dfsg-3_i386.deb target=_blank>http://security.debian.org/pool/updates/main/libx/libxml2/libxml2-dbg_2.6.27.dfsg-3_i386.deb</a>
Size/MD5 checksum: 857370 6a293fc2b6aeadb289e28a4566fbfc86
<a href=http://security.debian.org/pool/updates/main/libx/libxml2/libxml2-dev_2.6.27.dfsg-3_i386.deb target=_blank>http://security.debian.org/pool/updates/main/libx/libxml2/libxml2-dev_2.6.27.dfsg-3_i386.deb</a>
Size/MD5 checksum: 681830 2117114ebcaa25a76d21c454df990789
<a href=http://security.debian.org/pool/updates/main/libx/libxml2/libxml2_2.6.27.dfsg-3_i386.deb target=_blank>http://security.debian.org/pool/updates/main/libx/libxml2/libxml2_2.6.27.dfsg-3_i386.deb</a>
Size/MD5 checksum: 755986 7291a82a169cd4fa7b0d3347685fb3ad
<a href=http://security.debian.org/pool/updates/main/libx/libxml2/libxml2-utils_2.6.27.dfsg-3_i386.deb target=_blank>http://security.debian.org/pool/updates/main/libx/libxml2/libxml2-utils_2.6.27.dfsg-3_i386.deb</a>
Size/MD5 checksum: 34456 092ad89155004c50686cafca63b9257b
<a href=http://security.debian.org/pool/updates/main/libx/libxml2/python-libxml2_2.6.27.dfsg-3_i386.deb target=_blank>http://security.debian.org/pool/updates/main/libx/libxml2/python-libxml2_2.6.27.dfsg-3_i386.deb</a>
Size/MD5 checksum: 169520 55365fa5e3fe422f0c09492d8289db6b
ia64 architecture (Intel ia64)
<a href=http://security.debian.org/pool/updates/main/libx/libxml2/libxml2_2.6.27.dfsg-3_ia64.deb target=_blank>http://security.debian.org/pool/updates/main/libx/libxml2/libxml2_2.6.27.dfsg-3_ia64.deb</a>
Size/MD5 checksum: 1079332 09539a6412b3723ae3a5cda3c3ad9909
<a href=http://security.debian.org/pool/updates/main/libx/libxml2/python-libxml2_2.6.27.dfsg-3_ia64.deb target=_blank>http://security.debian.org/pool/updates/main/libx/libxml2/python-libxml2_2.6.27.dfsg-3_ia64.deb</a>
Size/MD5 checksum: 196528 72eee7603a33f7f06046fed3a7cd19e3
<a href=http://security.debian.org/pool/updates/main/libx/libxml2/libxml2-dev_2.6.27.dfsg-3_ia64.deb target=_blank>http://security.debian.org/pool/updates/main/libx/libxml2/libxml2-dev_2.6.27.dfsg-3_ia64.deb</a>
Size/MD5 checksum: 1105612 e3ac30716a2199d3c37f50ae7ab1bdc3
<a href=http://security.debian.org/pool/updates/main/libx/libxml2/libxml2-dbg_2.6.27.dfsg-3_ia64.deb target=_blank>http://security.debian.org/pool/updates/main/libx/libxml2/libxml2-dbg_2.6.27.dfsg-3_ia64.deb</a>
Size/MD5 checksum: 873890 f3d98ef2b14a8e48a8f8c44ced776b62
<a href=http://security.debian.org/pool/updates/main/libx/libxml2/libxml2-utils_2.6.27.dfsg-3_ia64.deb target=_blank>http://security.debian.org/pool/updates/main/libx/libxml2/libxml2-utils_2.6.27.dfsg-3_ia64.deb</a>
Size/MD5 checksum: 48492 629a7c71342c5b380fc3e72c7bb8ad16
mipsel architecture (MIPS (Little Endian))
<a href=http://security.debian.org/pool/updates/main/libx/libxml2/python-libxml2_2.6.27.dfsg-3_mipsel.deb target=_blank>http://security.debian.org/pool/updates/main/libx/libxml2/python-libxml2_2.6.27.dfsg-3_mipsel.deb</a>
Size/MD5 checksum: 168694 adce98b5257168bdb17c8a7aa0e60131
<a href=http://security.debian.org/pool/updates/main/libx/libxml2/libxml2-dev_2.6.27.dfsg-3_mipsel.deb target=_blank>http://security.debian.org/pool/updates/main/libx/libxml2/libxml2-dev_2.6.27.dfsg-3_mipsel.deb</a>
Size/MD5 checksum: 832722 cea7eaeb7952fa2c204803f004a23c79
<a href=http://security.debian.org/pool/updates/main/libx/libxml2/libxml2_2.6.27.dfsg-3_mipsel.deb target=_blank>http://security.debian.org/pool/updates/main/libx/libxml2/libxml2_2.6.27.dfsg-3_mipsel.deb</a>
Size/MD5 checksum: 768330 94bb5ac441e8ed3b8f14ca21fdcf7b5a
<a href=http://security.debian.org/pool/updates/main/libx/libxml2/libxml2-dbg_2.6.27.dfsg-3_mipsel.deb target=_blank>http://security.debian.org/pool/updates/main/libx/libxml2/libxml2-dbg_2.6.27.dfsg-3_mipsel.deb</a>
Size/MD5 checksum: 897532 ffeec2f653021b3423f9d94610ca522f
<a href=http://security.debian.org/pool/updates/main/libx/libxml2/libxml2-utils_2.6.27.dfsg-3_mipsel.deb target=_blank>http://security.debian.org/pool/updates/main/libx/libxml2/libxml2-utils_2.6.27.dfsg-3_mipsel.deb</a>
Size/MD5 checksum: 34404 3b43ed7f884ba01176d6dc9ee8c0ca54
powerpc architecture (PowerPC)
<a href=http://security.debian.org/pool/updates/main/libx/libxml2/libxml2-dbg_2.6.27.dfsg-3_powerpc.deb target=_blank>http://security.debian.org/pool/updates/main/libx/libxml2/libxml2-dbg_2.6.27.dfsg-3_powerpc.deb</a>
Size/MD5 checksum: 897856 b5eacbc0ea09978b887707ed9b23fabb
<a href=http://security.debian.org/pool/updates/main/libx/libxml2/libxml2_2.6.27.dfsg-3_powerpc.deb target=_blank>http://security.debian.org/pool/updates/main/libx/libxml2/libxml2_2.6.27.dfsg-3_powerpc.deb</a>
Size/MD5 checksum: 779568 55f1f4ed3bdb39bc8bc59d74992b91e6
<a href=http://security.debian.org/pool/updates/main/libx/libxml2/libxml2-utils_2.6.27.dfsg-3_powerpc.deb target=_blank>http://security.debian.org/pool/updates/main/libx/libxml2/libxml2-utils_2.6.27.dfsg-3_powerpc.deb</a>
Size/MD5 checksum: 37658 0920a98fef39eabeffc2e6f4083ad6d5
<a href=http://security.debian.org/pool/updates/main/libx/libxml2/libxml2-dev_2.6.27.dfsg-3_powerpc.deb target=_blank>http://security.debian.org/pool/updates/main/libx/libxml2/libxml2-dev_2.6.27.dfsg-3_powerpc.deb</a>
Size/MD5 checksum: 770592 196fb7a7f7636cb5e350a97c4e06c020
<a href=http://security.debian.org/pool/updates/main/libx/libxml2/python-libxml2_2.6.27.dfsg-3_powerpc.deb target=_blank>http://security.debian.org/pool/updates/main/libx/libxml2/python-libxml2_2.6.27.dfsg-3_powerpc.deb</a>
Size/MD5 checksum: 172722 64c1948d58bbf8b9094234715fca2509
s390 architecture (IBM S/390)
<a href=http://security.debian.org/pool/updates/main/libx/libxml2/libxml2-dev_2.6.27.dfsg-3_s390.deb target=_blank>http://security.debian.org/pool/updates/main/libx/libxml2/libxml2-dev_2.6.27.dfsg-3_s390.deb</a>
Size/MD5 checksum: 749806 20d00f95a218a47daae2a86342e3222e
<a href=http://security.debian.org/pool/updates/main/libx/libxml2/libxml2-dbg_2.6.27.dfsg-3_s390.deb target=_blank>http://security.debian.org/pool/updates/main/libx/libxml2/libxml2-dbg_2.6.27.dfsg-3_s390.deb</a>
Size/MD5 checksum: 885108 5ca88f61170d06854c9c1d9a86f3798d
<a href=http://security.debian.org/pool/updates/main/libx/libxml2/python-libxml2_2.6.27.dfsg-3_s390.deb target=_blank>http://security.debian.org/pool/updates/main/libx/libxml2/python-libxml2_2.6.27.dfsg-3_s390.deb</a>
Size/MD5 checksum: 185726 bdfda7d18d0d0cc5d992e8548ed637f1
<a href=http://security.debian.org/pool/updates/main/libx/libxml2/libxml2-utils_2.6.27.dfsg-3_s390.deb target=_blank>http://security.debian.org/pool/updates/main/libx/libxml2/libxml2-utils_2.6.27.dfsg-3_s390.deb</a>
Size/MD5 checksum: 36364 9c3b2e9ac8e781bc990616d752752861
<a href=http://security.debian.org/pool/updates/main/libx/libxml2/libxml2_2.6.27.dfsg-3_s390.deb target=_blank>http://security.debian.org/pool/updates/main/libx/libxml2/libxml2_2.6.27.dfsg-3_s390.deb</a>
Size/MD5 checksum: 805446 f11839b2b45fc83a7972b867094773b2
sparc architecture (Sun SPARC/UltraSPARC)
<a href=http://security.debian.org/pool/updates/main/libx/libxml2/libxml2-dbg_2.6.27.dfsg-3_sparc.deb target=_blank>http://security.debian.org/pool/updates/main/libx/libxml2/libxml2-dbg_2.6.27.dfsg-3_sparc.deb</a>
Size/MD5 checksum: 781288 3326281769c76631f973ff41682ab4ad
<a href=http://security.debian.org/pool/updates/main/libx/libxml2/python-libxml2_2.6.27.dfsg-3_sparc.deb target=_blank>http://security.debian.org/pool/updates/main/libx/libxml2/python-libxml2_2.6.27.dfsg-3_sparc.deb</a>
Size/MD5 checksum: 176878 60eba89a0a740429b8a8726ebcd175f1
<a href=http://security.debian.org/pool/updates/main/libx/libxml2/libxml2-utils_2.6.27.dfsg-3_sparc.deb target=_blank>http://security.debian.org/pool/updates/main/libx/libxml2/libxml2-utils_2.6.27.dfsg-3_sparc.deb</a>
Size/MD5 checksum: 34578 34b4efd5a8b68a33b85ada99757f824a
<a href=http://security.debian.org/pool/updates/main/libx/libxml2/libxml2_2.6.27.dfsg-3_sparc.deb target=_blank>http://security.debian.org/pool/updates/main/libx/libxml2/libxml2_2.6.27.dfsg-3_sparc.deb</a>
Size/MD5 checksum: 759292 a8e8ea8c000c365ecd2c6a04f0f748d3
<a href=http://security.debian.org/pool/updates/main/libx/libxml2/libxml2-dev_2.6.27.dfsg-3_sparc.deb target=_blank>http://security.debian.org/pool/updates/main/libx/libxml2/libxml2-dev_2.6.27.dfsg-3_sparc.deb</a>
Size/MD5 checksum: 712758 921af536cdc8ddd105768c4061aa2f3e
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
RedHat
------
RedHat已经为此发布了一个安全公告（RHSA-2008:0836-02）以及相应补丁:
RHSA-2008:0836-02：Moderate: libxml2 security update
链接：<a href=https://www.redhat.com/support/errata/RHSA-2008-0836.html target=_blank>https://www.redhat.com/support/errata/RHSA-2008-0836.html</a>
XMLSoft
-------
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：
<a href=http://svn.gnome.org/viewvc/libxml2?view=revision&revision=3772 target=_blank>http://svn.gnome.org/viewvc/libxml2?view=revision&revision=3772</a>