Emacs是一个可扩展的实时显示编辑器。

Emacs在处理畸形GIF图形时存在漏洞，远程攻击者可能利用此漏洞导致用户Emacs崩溃。

Emacs没有正确地计算某些GIF图形的大小，如果用户受骗打开了恶意的GIF图形的话，就会导致Emacs出现分段错误而崩溃。

GNU Emacs
Debian

Debian已经为此发布了一个安全公告（DSA-1316-1）以及相应补丁:
DSA-1316-1：New emacs21 packages fix denial of service
链接：<a href=“http://www.debian.org/security/2007/dsa-1316” target=“_blank”>http://www.debian.org/security/2007/dsa-1316</a>

补丁下载：

Source archives:

<a href=“http://security.debian.org/pool/updates/main/e/emacs21/emacs21_21.4a+1.orig.tar.gz” target=“_blank”>http://security.debian.org/pool/updates/main/e/emacs21/emacs21_21.4a+1.orig.tar.gz</a>
Size/MD5 checksum: 15188829 2614ad1ce5c547e682e76049717a704d
<a href=“http://security.debian.org/pool/updates/main/e/emacs21/emacs21_21.4a+1-3etch1.diff.gz” target=“_blank”>http://security.debian.org/pool/updates/main/e/emacs21/emacs21_21.4a+1-3etch1.diff.gz</a>
Size/MD5 checksum: 189123 efad0ca53f0dbddb93b2cbef0edb350d
<a href=“http://security.debian.org/pool/updates/main/e/emacs21/emacs21_21.4a+1-3etch1.dsc” target=“_blank”>http://security.debian.org/pool/updates/main/e/emacs21/emacs21_21.4a+1-3etch1.dsc</a>
Size/MD5 checksum: 893 01f93796b7e4cbfb0c07fc211b49ebfa

Architecture independent packages:

<a href=“http://security.debian.org/pool/updates/main/e/emacs21/emacs21-common_21.4a+1-3etch1_all.deb” target=“_blank”>http://security.debian.org/pool/updates/main/e/emacs21/emacs21-common_21.4a+1-3etch1_all.deb</a>
Size/MD5 checksum: 9450540 eb73296f7683a65384cd41905f6dc39c
<a href=“http://security.debian.org/pool/updates/main/e/emacs21/emacs21-el_21.4a+1-3etch1_all.deb” target=“_blank”>http://security.debian.org/pool/updates/main/e/emacs21/emacs21-el_21.4a+1-3etch1_all.deb</a>
Size/MD5 checksum: 7218194 cac7a6629afe81db77af34e344194852
<a href=“http://security.debian.org/pool/updates/main/e/emacs21/emacs_21.4a+1-3etch1_all.deb” target=“_blank”>http://security.debian.org/pool/updates/main/e/emacs21/emacs_21.4a+1-3etch1_all.deb</a>
Size/MD5 checksum: 23846 b8675a67384a58f59befec0577eca744

alpha architecture (DEC Alpha)

<a href=“http://security.debian.org/pool/updates/main/e/emacs21/emacs21_21.4a+1-3etch1_alpha.deb” target=“_blank”>http://security.debian.org/pool/updates/main/e/emacs21/emacs21_21.4a+1-3etch1_alpha.deb</a>
Size/MD5 checksum: 2329172 9468d7d11509518ec4d6e97caf26cc86
<a href=“http://security.debian.org/pool/updates/main/e/emacs21/emacs21-nox_21.4a+1-3etch1_alpha.deb” target=“_blank”>http://security.debian.org/pool/updates/main/e/emacs21/emacs21-nox_21.4a+1-3etch1_alpha.deb</a>
Size/MD5 checksum: 2085080 6576dd8ef28a1055cb1017ffcc9aad74
<a href=“http://security.debian.org/pool/updates/main/e/emacs21/emacs21-bin-common_21.4a+1-3etch1_alpha.deb” target=“_blank”>http://security.debian.org/pool/updates/main/e/emacs21/emacs21-bin-common_21.4a+1-3etch1_alpha.deb</a>
Size/MD5 checksum: 182974 565e5a66ab03c426078faa70c3305349

amd64 architecture (AMD x86_64 (AMD64))

<a href=“http://security.debian.org/pool/updates/main/e/emacs21/emacs21-nox_21.4a+1-3etch1_amd64.deb” target=“_blank”>http://security.debian.org/pool/updates/main/e/emacs21/emacs21-nox_21.4a+1-3etch1_amd64.deb</a>
Size/MD5 checksum: 1969826 691f4641f9c3e3fd37b149ae5478d65d
<a href=“http://security.debian.org/pool/updates/main/e/emacs21/emacs21_21.4a+1-3etch1_amd64.deb” target=“_blank”>http://security.debian.org/pool/updates/main/e/emacs21/emacs21_21.4a+1-3etch1_amd64.deb</a>
Size/MD5 checksum: 2187854 9fcfd83efc6ce06c675e68fa43b8fded
<a href=“http://security.debian.org/pool/updates/main/e/emacs21/emacs21-bin-common_21.4a+1-3etch1_amd64.deb” target=“_blank”>http://security.debian.org/pool/updates/main/e/emacs21/emacs21-bin-common_21.4a+1-3etch1_amd64.deb</a>
Size/MD5 checksum: 162136 1973e185e0c221c03dbf77df2e460df7

arm architecture (ARM)

<a href=“http://security.debian.org/pool/updates/main/e/emacs21/emacs21-nox_21.4a+1-3etch1_arm.deb” target=“_blank”>http://security.debian.org/pool/updates/main/e/emacs21/emacs21-nox_21.4a+1-3etch1_arm.deb</a>
Size/MD5 checksum: 1828924 f6bce578f44fb1f1a1ab31217f926708
<a href=“http://security.debian.org/pool/updates/main/e/emacs21/emacs21_21.4a+1-3etch1_arm.deb” target=“_blank”>http://security.debian.org/pool/updates/main/e/emacs21/emacs21_21.4a+1-3etch1_arm.deb</a>
Size/MD5 checksum: 2030164 e3991619fdb58d75d95ab480fb191c79
<a href=“http://security.debian.org/pool/updates/main/e/emacs21/emacs21-bin-common_21.4a+1-3etch1_arm.deb” target=“_blank”>http://security.debian.org/pool/updates/main/e/emacs21/emacs21-bin-common_21.4a+1-3etch1_arm.deb</a>
Size/MD5 checksum: 147964 84453604acd1f52971da2bdd785fad17

hppa architecture (HP PA RISC)

<a href=“http://security.debian.org/pool/updates/main/e/emacs21/emacs21-nox_21.4a+1-3etch1_hppa.deb” target=“_blank”>http://security.debian.org/pool/updates/main/e/emacs21/emacs21-nox_21.4a+1-3etch1_hppa.deb</a>
Size/MD5 checksum: 1961192 f169821c8a1f27c44c3a2f41ca2f3651
<a href=“http://security.debian.org/pool/updates/main/e/emacs21/emacs21_21.4a+1-3etch1_hppa.deb” target=“_blank”>http://security.debian.org/pool/updates/main/e/emacs21/emacs21_21.4a+1-3etch1_hppa.deb</a>
Size/MD5 checksum: 2187120 37e9cc501a0ed894506700f3979a9cc0
<a href=“http://security.debian.org/pool/updates/main/e/emacs21/emacs21-bin-common_21.4a+1-3etch1_hppa.deb” target=“_blank”>http://security.debian.org/pool/updates/main/e/emacs21/emacs21-bin-common_21.4a+1-3etch1_hppa.deb</a>
Size/MD5 checksum: 162908 be7bc21995279915d27c5755904373d5

i386 architecture (Intel ia32)

<a href=“http://security.debian.org/pool/updates/main/e/emacs21/emacs21-bin-common_21.4a+1-3etch1_i386.deb” target=“_blank”>http://security.debian.org/pool/updates/main/e/emacs21/emacs21-bin-common_21.4a+1-3etch1_i386.deb</a>
Size/MD5 checksum: 146884 f295798eef85bf559ca830f0a87de5c1
<a href=“http://security.debian.org/pool/updates/main/e/emacs21/emacs21_21.4a+1-3etch1_i386.deb” target=“_blank”>http://security.debian.org/pool/updates/main/e/emacs21/emacs21_21.4a+1-3etch1_i386.deb</a>
Size/MD5 checksum: 2029074 0ad01edbae57f38fd98b7e166363c15d
<a href=“http://security.debian.org/pool/updates/main/e/emacs21/emacs21-nox_21.4a+1-3etch1_i386.deb” target=“_blank”>http://security.debian.org/pool/updates/main/e/emacs21/emacs21-nox_21.4a+1-3etch1_i386.deb</a>
Size/MD5 checksum: 1837132 3228c6d0f29ef3367c962893e6ea7325

ia64 architecture (Intel ia64)

<a href=“http://security.debian.org/pool/updates/main/e/emacs21/emacs21-bin-common_21.4a+1-3etch1_ia64.deb” target=“_blank”>http://security.debian.org/pool/updates/main/e/emacs21/emacs21-bin-common_21.4a+1-3etch1_ia64.deb</a>
Size/MD5 checksum: 215278 adc3e9e2590f28ddaa4a415e6e07d57e
<a href=“http://security.debian.org/pool/updates/main/e/emacs21/emacs21-nox_21.4a+1-3etch1_ia64.deb” target=“_blank”>http://security.debian.org/pool/updates/main/e/emacs21/emacs21-nox_21.4a+1-3etch1_ia64.deb</a>
Size/MD5 checksum: 2351410 8b0192deacf060b17623a2a3274b179b
<a href=“http://security.debian.org/pool/updates/main/e/emacs21/emacs21_21.4a+1-3etch1_ia64.deb” target=“_blank”>http://security.debian.org/pool/updates/main/e/emacs21/emacs21_21.4a+1-3etch1_ia64.deb</a>
Size/MD5 checksum: 2707896 a13cc5a1192c910f17b9b8d56ae2af35

mips architecture (MIPS (Big Endian))

<a href=“http://security.debian.org/pool/updates/main/e/emacs21/emacs21_21.4a+1-3etch1_mips.deb” target=“_blank”>http://security.debian.org/pool/updates/main/e/emacs21/emacs21_21.4a+1-3etch1_mips.deb</a>
Size/MD5 checksum: 2264302 f15a5884dde71bb4be70030b84accdf9
<a href=“http://security.debian.org/pool/updates/main/e/emacs21/emacs21-nox_21.4a+1-3etch1_mips.deb” target=“_blank”>http://security.debian.org/pool/updates/main/e/emacs21/emacs21-nox_21.4a+1-3etch1_mips.deb</a>
Size/MD5 checksum: 2026274 65936d472970fccab319540e5508ce57
<a href=“http://security.debian.org/pool/updates/main/e/emacs21/emacs21-bin-common_21.4a+1-3etch1_mips.deb” target=“_blank”>http://security.debian.org/pool/updates/main/e/emacs21/emacs21-bin-common_21.4a+1-3etch1_mips.deb</a>
Size/MD5 checksum: 165656 9c9483290fd960b049e1a63cb1295165

mipsel architecture (MIPS (Little Endian))

<a href=“http://security.debian.org/pool/updates/main/e/emacs21/emacs21-nox_21.4a+1-3etch1_mipsel.deb” target=“_blank”>http://security.debian.org/pool/updates/main/e/emacs21/emacs21-nox_21.4a+1-3etch1_mipsel.deb</a>
Size/MD5 checksum: 1978868 9822056f7ef84d0f5691585ee3d524a0
<a href=“http://security.debian.org/pool/updates/main/e/emacs21/emacs21-bin-common_21.4a+1-3etch1_mipsel.deb” target=“_blank”>http://security.debian.org/pool/updates/main/e/emacs21/emacs21-bin-common_21.4a+1-3etch1_mipsel.deb</a>
Size/MD5 checksum: 165668 431c39dd0dd50d17ca2958f90ee7df33
<a href=“http://security.debian.org/pool/updates/main/e/emacs21/emacs21_21.4a+1-3etch1_mipsel.deb” target=“_blank”>http://security.debian.org/pool/updates/main/e/emacs21/emacs21_21.4a+1-3etch1_mipsel.deb</a>
Size/MD5 checksum: 2216624 66e1c85453ae9c7a49c9a2fb9d4a8480

powerpc architecture (PowerPC)

<a href=“http://security.debian.org/pool/updates/main/e/emacs21/emacs21_21.4a+1-3etch1_powerpc.deb” target=“_blank”>http://security.debian.org/pool/updates/main/e/emacs21/emacs21_21.4a+1-3etch1_powerpc.deb</a>
Size/MD5 checksum: 2118924 c39baa8043ded1bb0bed737e9c117dba
<a href=“http://security.debian.org/pool/updates/main/e/emacs21/emacs21-nox_21.4a+1-3etch1_powerpc.deb” target=“_blank”>http://security.debian.org/pool/updates/main/e/emacs21/emacs21-nox_21.4a+1-3etch1_powerpc.deb</a>
Size/MD5 checksum: 1905208 4d1d6f37948fc7c22787365a449fd2b7
<a href=“http://security.debian.org/pool/updates/main/e/emacs21/emacs21-bin-common_21.4a+1-3etch1_powerpc.deb” target=“_blank”>http://security.debian.org/pool/updates/main/e/emacs21/emacs21-bin-common_21.4a+1-3etch1_powerpc.deb</a>
Size/MD5 checksum: 155700 e9cd7d62d7897ead5daaafe6c4baf83e

s390 architecture (IBM S/390)

<a href=“http://security.debian.org/pool/updates/main/e/emacs21/emacs21-nox_21.4a+1-3etch1_s390.deb” target=“_blank”>http://security.debian.org/pool/updates/main/e/emacs21/emacs21-nox_21.4a+1-3etch1_s390.deb</a>
Size/MD5 checksum: 1931752 2c9d6527bfc7bb263e342815f658804b
<a href=“http://security.debian.org/pool/updates/main/e/emacs21/emacs21_21.4a+1-3etch1_s390.deb” target=“_blank”>http://security.debian.org/pool/updates/main/e/emacs21/emacs21_21.4a+1-3etch1_s390.deb</a>
Size/MD5 checksum: 2146028 8fdce62a7aa6800bf6cdfe5560402886
<a href=“http://security.debian.org/pool/updates/main/e/emacs21/emacs21-bin-common_21.4a+1-3etch1_s390.deb” target=“_blank”>http://security.debian.org/pool/updates/main/e/emacs21/emacs21-bin-common_21.4a+1-3etch1_s390.deb</a>
Size/MD5 checksum: 157108 7e3c170c7b558bd49bb04a150c2fa05d

sparc architecture (Sun SPARC/UltraSPARC)

<a href=“http://security.debian.org/pool/updates/main/e/emacs21/emacs21_21.4a+1-3etch1_sparc.deb” target=“_blank”>http://security.debian.org/pool/updates/main/e/emacs21/emacs21_21.4a+1-3etch1_sparc.deb</a>
Size/MD5 checksum: 2114942 2739d3fbe7ccdb9376018324921f3250
<a href=“http://security.debian.org/pool/updates/main/e/emacs21/emacs21-bin-common_21.4a+1-3etch1_sparc.deb” target=“_blank”>http://security.debian.org/pool/updates/main/e/emacs21/emacs21-bin-common_21.4a+1-3etch1_sparc.deb</a>
Size/MD5 checksum: 148146 3f31d435a2477804cd2a1bf6c2c93a77
<a href=“http://security.debian.org/pool/updates/main/e/emacs21/emacs21-nox_21.4a+1-3etch1_sparc.deb” target=“_blank”>http://security.debian.org/pool/updates/main/e/emacs21/emacs21-nox_21.4a+1-3etch1_sparc.deb</a>
Size/MD5 checksum: 1913248 5746adae76a13ffabbf243f254d531e7

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