headers()函数空指针引用拒绝服务漏洞

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：
--------------------------------------------------------------------------------
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 （zeuspenguin@gmail.com）
 
  链接：https://bugzilla.redhat.com/show_bug.cgi?format=multiple&id=539565
        ?bug=552035
       
*>

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！

?bug=552035

建议：
--------------------------------------------------------------------------------
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：

补丁下载：

Source archives:

Size/MD5 checksum:   436610 d385a1e7a23020d421531818d5606b5b
+etch3.dsc
Size/MD5 checksum:      611 c4e1baf967a3dbb19a28bf2da8c32fdb
+etch3.diff.gz
Size/MD5 checksum:     6822 794447a883501912bf6f448b9a561293

alpha architecture (DEC Alpha)

+etch3_alpha.deb
Size/MD5 checksum:   211432 14edf103968d05ed6b3f0149e790881c

amd64 architecture (AMD x86_64 (AMD64))

+etch3_amd64.deb
Size/MD5 checksum:   196040 70ac342b4cf946ad70d9914c5bc54d38

arm architecture (ARM)

+etch3_arm.deb
Size/MD5 checksum:   187230 0caef4e2898e11690a49eb45a539ad37

hppa architecture (HP PA RISC)

+etch3_hppa.deb
Size/MD5 checksum:   205304 05e92ede05223ee00832a7fa22f8712f

i386 architecture (Intel ia32)

+etch3_i386.deb
Size/MD5 checksum:   184404 764b3c087859dcf45d888fe6c7f55176

ia64 architecture (Intel ia64)

+etch3_ia64.deb
Size/MD5 checksum:   278594 4ae16a2fe0a790a1eb567aa2a2c909ea

mips architecture (MIPS (Big Endian))

+etch3_mips.deb
Size/MD5 checksum:   208380 a7408a0c1f14f235aec3c9f3a12d5694

mipsel architecture (MIPS (Little Endian))

+etch3_mipsel.deb
Size/MD5 checksum:   207790 67255cb5b5848c714921d0a44abd449d

powerpc architecture (PowerPC)

+etch3_powerpc.deb
Size/MD5 checksum:   186666 a0a0505d498f51d2a63e615e8e3e8fe7

s390 architecture (IBM S/390)

+etch3_s390.deb
Size/MD5 checksum:   199838 b0d4f3cc9878b0280a8e56a0bd29bd53

sparc architecture (Sun SPARC/UltraSPARC)

+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: