安全研究
安全漏洞
lighttpd文件描述符数组远程拒绝服务漏洞
发布日期：2008-02-13
更新日期：2008-02-25
受影响系统：
LightTPD LightTPD 1.4.18描述：
BUGTRAQ ID: 27943
CVE(CAN) ID: CVE-2008-0983
Lighttpd是一款轻型的开放源码Web Server软件包。
Lighttpd在分配全局文件描述符数组时存在计算错误，远程攻击者可能利用此漏洞导致服务不可用。
创建文件描述符数组的方式如下：
fdevent.c：
15 fdevents *fdevent_init(size_t maxfds, fdevent_handler_t type) {
19 ev->fdarray = calloc(maxfds, sizeof(*ev->fdarray));
server.c：
1076 if (NULL == (srv->ev = fdevent_init(srv->max_fds + 1, srv->event_handler))) {
在同一文件中的之前部分：
679 if (0 != getrlimit(RLIMIT_NOFILE, &rlim)) {
680 log_error_write(srv, __FILE__, __LINE__,
681 "ss", "couldn't get 'max filedescriptors'",
682 strerror(errno));
683 return -1;
684 }
685
686 if (use_rlimit && srv->srvconf.max_fds) {
687 /* set rlimits */
688
689 rlim.rlim_cur = srv->srvconf.max_fds;
690 rlim.rlim_max = srv->srvconf.max_fds;
691
692 if (0 != setrlimit(RLIMIT_NOFILE, &rlim)) {
693 log_error_write(srv, __FILE__, __LINE__,
694 "ss", "couldn't set 'max filedescriptors'",
695 strerror(errno));
696 return -1;
697 }
698 }
700 /* #372: solaris need some fds extra for devpoll */
701 if (rlim.rlim_cur > 10) rlim.rlim_cur -= 10;
827 srv->max_fds = rlim.rlim_cur;
进程获取当前所配置的rlimit并保存到rlim中。如果配置设置了max_fds，就会覆盖当前任务所配置的。然后，max_fds以10递减，使用max_fds大小分配文件描述符数组。最终，系统可能给出多于max_fds个文件描述符，出现分段错误，导致崩溃。
<*来源：fdeletang
链接：http://secunia.com/advisories/29066/
http://trac.lighttpd.net/trac/ticket/1562
http://www.debian.org/security/2008/dsa-1609
*>
建议：
临时解决方法：
* 如果没有运行solaris的话，标注server.c的701行
* 在fdevent.c文件的19行用maxfds + 10替换maxfds
厂商补丁：
Debian
------
Debian已经为此发布了一个安全公告（DSA-1609-1）以及相应补丁:
DSA-1609-1：New lighttpd packages fix multiple DOS issues
链接：http://www.debian.org/security/2008/dsa-1609
补丁下载：
Source archives:
http://security.debian.org/pool/updates/main/l/lighttpd/lighttpd_1.4.13-4etch9.dsc
Size/MD5 checksum: 1106 b9e468fa16bb1874ceef9596827a0aee
http://security.debian.org/pool/updates/main/l/lighttpd/lighttpd_1.4.13.orig.tar.gz
Size/MD5 checksum: 793309 3a64323b8482b0e8a6246dbfdb4c39dc
http://security.debian.org/pool/updates/main/l/lighttpd/lighttpd_1.4.13-4etch9.diff.gz
Size/MD5 checksum: 37524 b935ac31122e596b50393b32412c4634
Architecture independent packages:
http://security.debian.org/pool/updates/main/l/lighttpd/lighttpd-doc_1.4.13-4etch9_all.deb
Size/MD5 checksum: 99444 f4da891e3055833d72cedb093ebe961b
alpha architecture (DEC Alpha)
http://security.debian.org/pool/updates/main/l/lighttpd/lighttpd-mod-cml_1.4.13-4etch9_alpha.deb
Size/MD5 checksum: 65236 07a7c10a1a9e8e5be6591eafdcb2af70
http://security.debian.org/pool/updates/main/l/lighttpd/lighttpd_1.4.13-4etch9_alpha.deb
Size/MD5 checksum: 319704 347221cd0521559c703e77a638101378
http://security.debian.org/pool/updates/main/l/lighttpd/lighttpd-mod-mysql-vhost_1.4.13-4etch9_alpha.deb
Size/MD5 checksum: 59970 cd8eebac5cafbfc86a94b7bdec622cdc
http://security.debian.org/pool/updates/main/l/lighttpd/lighttpd-mod-webdav_1.4.13-4etch9_alpha.deb
Size/MD5 checksum: 71720 2243711e9b479e7201bd075375341570
http://security.debian.org/pool/updates/main/l/lighttpd/lighttpd-mod-trigger-b4-dl_1.4.13-4etch9_alpha.deb
Size/MD5 checksum: 61748 e082eba9bed47e7d41b97b8c3faf2ab4
http://security.debian.org/pool/updates/main/l/lighttpd/lighttpd-mod-magnet_1.4.13-4etch9_alpha.deb
Size/MD5 checksum: 64804 2300124052e6cd3d16b5d912771a43d2
amd64 architecture (AMD x86_64 (AMD64))
http://security.debian.org/pool/updates/main/l/lighttpd/lighttpd-mod-webdav_1.4.13-4etch9_amd64.deb
Size/MD5 checksum: 70042 f216ba125297f9617e9b93ae5e9c1528
http://security.debian.org/pool/updates/main/l/lighttpd/lighttpd-mod-trigger-b4-dl_1.4.13-4etch9_amd64.deb
Size/MD5 checksum: 60890 0cf8ebc595c92cf0e5133cfb0fdb45f1
http://security.debian.org/pool/updates/main/l/lighttpd/lighttpd-mod-cml_1.4.13-4etch9_amd64.deb
Size/MD5 checksum: 64028 22bef6211d9afd320292721a796671fb
http://security.debian.org/pool/updates/main/l/lighttpd/lighttpd-mod-magnet_1.4.13-4etch9_amd64.deb
Size/MD5 checksum: 63726 1908fe9c6b35d03ac8cb8ca25bc119a8
http://security.debian.org/pool/updates/main/l/lighttpd/lighttpd-mod-mysql-vhost_1.4.13-4etch9_amd64.deb
Size/MD5 checksum: 59294 a0bc743d9720b97db28764c6c1e0f79c
http://security.debian.org/pool/updates/main/l/lighttpd/lighttpd_1.4.13-4etch9_amd64.deb
Size/MD5 checksum: 297536 0de34b9f4ef546ae5f38991f4676143a
arm architecture (ARM)
http://security.debian.org/pool/updates/main/l/lighttpd/lighttpd-mod-cml_1.4.13-4etch9_arm.deb
Size/MD5 checksum: 63132 28b693dd3dc65d743e84af5249e6867e
http://security.debian.org/pool/updates/main/l/lighttpd/lighttpd-mod-webdav_1.4.13-4etch9_arm.deb
Size/MD5 checksum: 69696 7c49c8c4dc0ae30526d0ccd02cec9376
http://security.debian.org/pool/updates/main/l/lighttpd/lighttpd-mod-trigger-b4-dl_1.4.13-4etch9_arm.deb
Size/MD5 checksum: 60870 bb8fa82a14b51ddf0c4de1e869755459
http://security.debian.org/pool/updates/main/l/lighttpd/lighttpd-mod-magnet_1.4.13-4etch9_arm.deb
Size/MD5 checksum: 62936 e831e83489ced32abeeae5c4a9b26e01
http://security.debian.org/pool/updates/main/l/lighttpd/lighttpd_1.4.13-4etch9_arm.deb
Size/MD5 checksum: 286636 77d3c387d79492d0655bf45930ed774a
http://security.debian.org/pool/updates/main/l/lighttpd/lighttpd-mod-mysql-vhost_1.4.13-4etch9_arm.deb
Size/MD5 checksum: 58744 7fe590b4b243a5d33f9328d23c25f037
hppa architecture (HP PA RISC)
http://security.debian.org/pool/updates/main/l/lighttpd/lighttpd-mod-cml_1.4.13-4etch9_hppa.deb
Size/MD5 checksum: 65586 fc9bc390e05808b64c7f3323465f3860
http://security.debian.org/pool/updates/main/l/lighttpd/lighttpd-mod-mysql-vhost_1.4.13-4etch9_hppa.deb
Size/MD5 checksum: 59958 3ba195a79e46a6e896482ffd79121daf
http://security.debian.org/pool/updates/main/l/lighttpd/lighttpd-mod-magnet_1.4.13-4etch9_hppa.deb
Size/MD5 checksum: 65072 7f750a4b25c1449c76216a4006bed3ef
http://security.debian.org/pool/updates/main/l/lighttpd/lighttpd-mod-trigger-b4-dl_1.4.13-4etch9_hppa.deb
Size/MD5 checksum: 61960 98543c413da83a34f1a066ea6701b4b8
http://security.debian.org/pool/updates/main/l/lighttpd/lighttpd-mod-webdav_1.4.13-4etch9_hppa.deb
Size/MD5 checksum: 73006 d49b3f59f4014f2982157b383667d6f4
http://security.debian.org/pool/updates/main/l/lighttpd/lighttpd_1.4.13-4etch9_hppa.deb
Size/MD5 checksum: 324090 bb1800b50a874f7286bd8d2a6bd69806
i386 architecture (Intel ia32)
http://security.debian.org/pool/updates/main/l/lighttpd/lighttpd_1.4.13-4etch9_i386.deb
Size/MD5 checksum: 289054 9d101f135f459437d125ea443d0f3652
http://security.debian.org/pool/updates/main/l/lighttpd/lighttpd-mod-webdav_1.4.13-4etch9_i386.deb
Size/MD5 checksum: 71210 9a6962f56b581b73320e0e8d75166aa3
http://security.debian.org/pool/updates/main/l/lighttpd/lighttpd-mod-magnet_1.4.13-4etch9_i386.deb
Size/MD5 checksum: 64018 864494c387986f427f3fa35a3eb8e688
http://security.debian.org/pool/updates/main/l/lighttpd/lighttpd-mod-trigger-b4-dl_1.4.13-4etch9_i386.deb
Size/MD5 checksum: 61270 45f87772bf860aa3463927599555948e
http://security.debian.org/pool/updates/main/l/lighttpd/lighttpd-mod-cml_1.4.13-4etch9_i386.deb
Size/MD5 checksum: 64260 7084c5bb2d0145dab2ce6902d4b3f251
http://security.debian.org/pool/updates/main/l/lighttpd/lighttpd-mod-mysql-vhost_1.4.13-4etch9_i386.deb
Size/MD5 checksum: 59494 eb4ce22389b5eacbe7f279731f89dad7
mips architecture (MIPS (Big Endian))
http://security.debian.org/pool/updates/main/l/lighttpd/lighttpd-mod-mysql-vhost_1.4.13-4etch9_mips.deb
Size/MD5 checksum: 58634 2dead181d2874aba311da3c28ae5ce00
http://security.debian.org/pool/updates/main/l/lighttpd/lighttpd_1.4.13-4etch9_mips.deb
Size/MD5 checksum: 296406 64a97a2fcd2d78a4e3a9e1c57253c5ad
http://security.debian.org/pool/updates/main/l/lighttpd/lighttpd-mod-trigger-b4-dl_1.4.13-4etch9_mips.deb
Size/MD5 checksum: 60026 bccc394d18921f666d9cda04f6c50e6e
http://security.debian.org/pool/updates/main/l/lighttpd/lighttpd-mod-webdav_1.4.13-4etch9_mips.deb
Size/MD5 checksum: 69302 003ca7f181dead692e8070206ec555f8
http://security.debian.org/pool/updates/main/l/lighttpd/lighttpd-mod-magnet_1.4.13-4etch9_mips.deb
Size/MD5 checksum: 62598 027b727988bc41f1f61bf208dbffd03e
http://security.debian.org/pool/updates/main/l/lighttpd/lighttpd-mod-cml_1.4.13-4etch9_mips.deb
Size/MD5 checksum: 62724 16f4243a6d66a7e0cfea2a2c5430eed4
powerpc architecture (PowerPC)
http://security.debian.org/pool/updates/main/l/lighttpd/lighttpd_1.4.13-4etch9_powerpc.deb
Size/MD5 checksum: 324104 ff3b010a174d956f4b2e1d4907883290
http://security.debian.org/pool/updates/main/l/lighttpd/lighttpd-mod-magnet_1.4.13-4etch9_powerpc.deb
Size/MD5 checksum: 65190 ed5a4ddac8ea7fa260b3ffed37b03b84
http://security.debian.org/pool/updates/main/l/lighttpd/lighttpd-mod-cml_1.4.13-4etch9_powerpc.deb
Size/MD5 checksum: 65462 c5777f10ab6a3ee8776d71c53808143c
http://security.debian.org/pool/updates/main/l/lighttpd/lighttpd-mod-mysql-vhost_1.4.13-4etch9_powerpc.deb
Size/MD5 checksum: 60718 c8c9da07c137e73c16fda7e1347a61b4
http://security.debian.org/pool/updates/main/l/lighttpd/lighttpd-mod-trigger-b4-dl_1.4.13-4etch9_powerpc.deb
Size/MD5 checksum: 62528 407cf5d91565f8d22cb54e540e95cec0
http://security.debian.org/pool/updates/main/l/lighttpd/lighttpd-mod-webdav_1.4.13-4etch9_powerpc.deb
Size/MD5 checksum: 71840 2d40c1080b696a949262cf19dafa93b7
s390 architecture (IBM S/390)
http://security.debian.org/pool/updates/main/l/lighttpd/lighttpd-mod-mysql-vhost_1.4.13-4etch9_s390.deb
Size/MD5 checksum: 59730 aa85c7a60138cd531b2693a0f02e7466
http://security.debian.org/pool/updates/main/l/lighttpd/lighttpd-mod-cml_1.4.13-4etch9_s390.deb
Size/MD5 checksum: 64778 351ff20233c9ac9c897489b04129976f
http://security.debian.org/pool/updates/main/l/lighttpd/lighttpd_1.4.13-4etch9_s390.deb
Size/MD5 checksum: 307340 b84df276716669831f54ca5926158ba0
http://security.debian.org/pool/updates/main/l/lighttpd/lighttpd-mod-webdav_1.4.13-4etch9_s390.deb
Size/MD5 checksum: 71520 960bbc9184cda5625fec9e5c8f721751
http://security.debian.org/pool/updates/main/l/lighttpd/lighttpd-mod-trigger-b4-dl_1.4.13-4etch9_s390.deb
Size/MD5 checksum: 61230 c5bc149d49c8c8c0eadb53098c5802b8
http://security.debian.org/pool/updates/main/l/lighttpd/lighttpd-mod-magnet_1.4.13-4etch9_s390.deb
Size/MD5 checksum: 64392 4505fe625ce17c305a79c74226150150
sparc architecture (Sun SPARC/UltraSPARC)
http://security.debian.org/pool/updates/main/l/lighttpd/lighttpd_1.4.13-4etch9_sparc.deb
Size/MD5 checksum: 284464 660005588988330ef2742e208e18b1ed
http://security.debian.org/pool/updates/main/l/lighttpd/lighttpd-mod-mysql-vhost_1.4.13-4etch9_sparc.deb
Size/MD5 checksum: 58928 739d374e9412b1c33ffcc4d84e06ff4c
http://security.debian.org/pool/updates/main/l/lighttpd/lighttpd-mod-cml_1.4.13-4etch9_sparc.deb
Size/MD5 checksum: 63490 57c717bbd4a6c7a27c2b3ce664b447c6
http://security.debian.org/pool/updates/main/l/lighttpd/lighttpd-mod-trigger-b4-dl_1.4.13-4etch9_sparc.deb
Size/MD5 checksum: 60574 0fe2a1a268d154fdb6a11ef33a7c9a9f
http://security.debian.org/pool/updates/main/l/lighttpd/lighttpd-mod-magnet_1.4.13-4etch9_sparc.deb
Size/MD5 checksum: 63466 bbb49f9396ba560a5db3d4f30a78ab02
http://security.debian.org/pool/updates/main/l/lighttpd/lighttpd-mod-webdav_1.4.13-4etch9_sparc.deb
Size/MD5 checksum: 69956 cc2a681cb6e423b0d91aca6691628088
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
LightTPD
--------
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://trac.lighttpd.net/trac/attachment/ticket/1562/Fix-372-and-1562.patch
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