nginx ngx_http_process_request_headers()函数空指针引用拒绝服
houjinkai 2009-11-28
发布日期：2009-10-27
更新日期：2009-11-25
受影响系统：
Igor Sysoev nginx 0.8.x
Igor Sysoev nginx 0.7.x
Igor Sysoev nginx 0.6.x
Igor Sysoev nginx 0.5.x
Igor Sysoev nginx 0.4.x
不受影响系统：
Igor Sysoev nginx 0.8.14
Igor Sysoev nginx 0.7.62
Igor Sysoev nginx 0.6.39
Igor Sysoev nginx 0.5.38
描述：
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BUGTRAQ ID: 36839
CVE(CAN) ID: CVE-2009-3896
nginx是多平台的HTTP服务器和邮件代理服务器。
nginx服务器的src/http/ngx_http_parse.c文件的ngx_http_process_request_headers()函数中存在空指针引用错误，远程攻击者可以通过超长的URI来触发这个漏洞，导致worker进程崩溃。
<*来源：Jasson Bell （[email protected]）
链接：https://bugzilla.redhat.com/show_bug.cgi?format=multiple&id=539565
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=552035
http://www.debian.org/security/2009/dsa-1920
*>
测试方法：
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警 告
以下程序(方法)可能带有攻击性，仅供安全研究与教学之用。使用者风险自负！
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=552035
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-1920-1）以及相应补丁:
DSA-1920-1：New nginx packages fix denial of service
链接：http://www.debian.org/security/2009/dsa-1920
补丁下载：
Source archives:
http://security.debian.org/pool/updates/main/n/nginx/nginx_0.4.13.orig.tar.gz
Size/MD5 checksum: 436610 d385a1e7a23020d421531818d5606b5b
http://security.debian.org/pool/updates/main/n/nginx/nginx_0.4.13-2+etch3.dsc
Size/MD5 checksum: 611 c4e1baf967a3dbb19a28bf2da8c32fdb
http://security.debian.org/pool/updates/main/n/nginx/nginx_0.4.13-2+etch3.diff.gz
Size/MD5 checksum: 6822 794447a883501912bf6f448b9a561293
alpha architecture (DEC Alpha)
http://security.debian.org/pool/updates/main/n/nginx/nginx_0.4.13-2+etch3_alpha.deb
Size/MD5 checksum: 211432 14edf103968d05ed6b3f0149e790881c
amd64 architecture (AMD x86_64 (AMD64))
http://security.debian.org/pool/updates/main/n/nginx/nginx_0.4.13-2+etch3_amd64.deb
Size/MD5 checksum: 196040 70ac342b4cf946ad70d9914c5bc54d38
arm architecture (ARM)
http://security.debian.org/pool/updates/main/n/nginx/nginx_0.4.13-2+etch3_arm.deb
Size/MD5 checksum: 187230 0caef4e2898e11690a49eb45a539ad37
hppa architecture (HP PA RISC)
http://security.debian.org/pool/updates/main/n/nginx/nginx_0.4.13-2+etch3_hppa.deb
Size/MD5 checksum: 205304 05e92ede05223ee00832a7fa22f8712f
i386 architecture (Intel ia32)
http://security.debian.org/pool/updates/main/n/nginx/nginx_0.4.13-2+etch3_i386.deb
Size/MD5 checksum: 184404 764b3c087859dcf45d888fe6c7f55176
ia64 architecture (Intel ia64)
http://security.debian.org/pool/updates/main/n/nginx/nginx_0.4.13-2+etch3_ia64.deb
Size/MD5 checksum: 278594 4ae16a2fe0a790a1eb567aa2a2c909ea
mips architecture (MIPS (Big Endian))
http://security.debian.org/pool/updates/main/n/nginx/nginx_0.4.13-2+etch3_mips.deb
Size/MD5 checksum: 208380 a7408a0c1f14f235aec3c9f3a12d5694
mipsel architecture (MIPS (Little Endian))
http://security.debian.org/pool/updates/main/n/nginx/nginx_0.4.13-2+etch3_mipsel.deb
Size/MD5 checksum: 207790 67255cb5b5848c714921d0a44abd449d
powerpc architecture (PowerPC)
http://security.debian.org/pool/updates/main/n/nginx/nginx_0.4.13-2+etch3_powerpc.deb
Size/MD5 checksum: 186666 a0a0505d498f51d2a63e615e8e3e8fe7
s390 architecture (IBM S/390)
http://security.debian.org/pool/updates/main/n/nginx/nginx_0.4.13-2+etch3_s390.deb
Size/MD5 checksum: 199838 b0d4f3cc9878b0280a8e56a0bd29bd53
sparc architecture (Sun SPARC/UltraSPARC)
http://security.debian.org/pool/updates/main/n/nginx/nginx_0.4.13-2+etch3_sparc.deb
Size/MD5 checksum: 185332 9fdd4b7725b4060a311d7f35f9266cfb
Debian GNU/Linux 5.0 alias lenny
- --------------------------------
Stable updates are available for alpha, amd64, arm, armel, hppa, i386, ia64,
mips, mipsel, powerpc, s390 and sparc.
Source archives:
http://security.debian.org/pool/updates/main/n/nginx/nginx_0.6.32.orig.tar.gz
Size/MD5 checksum: 522183 c09a2ace3c91f45dabbb608b11e48ed1
http://security.debian.org/pool/updates/main/n/nginx/nginx_0.6.32-3+lenny3.dsc
Size/MD5 checksum: 1231 0acea5f6912c80de2c6b54b16c7f008b
http://security.debian.org/pool/updates/main/n/nginx/nginx_0.6.32-3+lenny3.diff.gz
Size/MD5 checksum: 10814 a5c652551a6457c8ead36578a5ba59bb
alpha architecture (DEC Alpha)
http://security.debian.org/pool/updates/main/n/nginx/nginx_0.6.32-3+lenny3_alpha.deb
Size/MD5 checksum: 297934 72777a5e04e324eef3f97d93623a4559
amd64 architecture (AMD x86_64 (AMD64))
http://security.debian.org/pool/updates/main/n/nginx/nginx_0.6.32-3+lenny3_amd64.deb
Size/MD5 checksum: 268654 8ba00b9fa72c1b6d92ba1f4af5b95e2d
arm architecture (ARM)
http://security.debian.org/pool/updates/main/n/nginx/nginx_0.6.32-3+lenny3_arm.deb
Size/MD5 checksum: 252062 7de60e3654a0aff273d3340dd46e2cda
armel architecture (ARM EABI)
http://security.debian.org/pool/updates/main/n/nginx/nginx_0.6.32-3+lenny3_armel.deb
Size/MD5 checksum: 252764 f0ba676c131f1fc992e27cf1c50440d7
hppa architecture (HP PA RISC)
http://security.debian.org/pool/updates/main/n/nginx/nginx_0.6.32-3+lenny3_hppa.deb
Size/MD5 checksum: 282454 7d9299fcc9ca9201905790eea2357527
i386 architecture (Intel ia32)
http://security.debian.org/pool/updates/main/n/nginx/nginx_0.6.32-3+lenny3_i386.deb
Size/MD5 checksum: 255294 c7e061bcc8d9272abd91c522e01e05dd
ia64 architecture (Intel ia64)
http://security.debian.org/pool/updates/main/n/nginx/nginx_0.6.32-3+lenny3_ia64.deb
Size/MD5 checksum: 420106 3356229c7f62e64c19dd3c3853cb7a87
mips architecture (MIPS (Big Endian))
http://security.debian.org/pool/updates/main/n/nginx/nginx_0.6.32-3+lenny3_mips.deb
Size/MD5 checksum: 283362 9c97f75512a4665c60e20f8fcfff6556
mipsel architecture (MIPS (Little Endian))
http://security.debian.org/pool/updates/main/n/nginx/nginx_0.6.32-3+lenny3_mipsel.deb
Size/MD5 checksum: 283598 2ebafc8e613da6d28f09d91e1287055c
powerpc architecture (PowerPC)
http://security.debian.org/pool/updates/main/n/nginx/nginx_0.6.32-3+lenny3_powerpc.deb
Size/MD5 checksum: 276188 9c4e725628b775d77aa3a5ccce16063a
s390 architecture (IBM S/390)
http://security.debian.org/pool/updates/main/n/nginx/nginx_0.6.32-3+lenny3_s390.deb
Size/MD5 checksum: 274074 1bbc736cc9651bfd041042b29096bdfa
sparc architecture (Sun SPARC/UltraSPARC)
http://security.debian.org/pool/updates/main/n/nginx/nginx_0.6.32-3+lenny3_sparc.deb
Size/MD5 checksum: 256738 eca03da76437d58f898a60c9cb5930d7
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��，使用下面的命令安装更新软件包：
# apt-get upgrade
