发布日期：2000-06-22
更新日期：2000-06-22

受影响系统：

Washington University wu-ftpd 2.4.2academ[BETA-18]
    - RedHat Linux 5.2
Washington University wu-ftpd 2.4.2academ[BETA1-15]
    - Caldera OpenLinux Standard 1.2
Washington University wu-ftpd 2.5.0
    - RedHat Linux 6.1
Washington University wu-ftpd 2.6.0
    - RedHat Linux 6.1

描述：

---

BUGTRAQ  ID: 1387
CVE(CAN) ID: CVE-2000-0573

Washington University FTP Server是一个非常流行的Unix系统下的FTP服务器。很多Unix和Linux的发行版本都把它作为默认安装的FTP服务器。

Wu-ftpd在SITE EXEC实现上存在格式化串溢出漏洞，远程攻击者可能利用此漏洞通过溢出攻击以root用户的权限执行任意指令。

Wu-ftpd的SITE EXEC将用户输入的数据错误的作为格式字符串传送给vsnprintf()函数，攻击者可以构造一个特殊的格式字符串，例如<retloc>%.f%.f%.f %.<ret>d%n来覆盖堆栈中的某些重要数据，返回地址或者保存的uid等等，攻击者可以远程执行系统命令。这种攻击并不等同于通常的缓冲区溢出攻击，主要是错误的使用vsnprintf()以及缺乏对用户输入数据的检查引起的。


<*来源：tf8 （tf8@zolo.freelsd.net）
  
  链接：http://www.linuxsecurity.com/advisories/advisory_documents/other_advisory-499.html
        ftp://patches.sgi.com/support/free/security/advisories/20000701-01-I
        http://www.cert.org/advisories/CA-2000-13.html
        http://www.caldera.com/support/security/advisories/CSSA-2000-020.0.txt
        http://www.debian.org/security/2000/debian-
        ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-00:29.[需要添加].asc
        http://online.securityfocus.com/advisories/2404
        http://www.ciac.org/ciac/bulletins/k-054.shtml
        ftp://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2000-010.txt.asc
        https://www.redhat.com/support/errata/RHSA-2000-039.html
        http://www.suse.com/de/support/security/_[需要添加]_txt.txt
        http://www.turbolinux.com/pipermail/tl-security-announce/2000-July/000390.html
*>

建议：

---

临时解决方法：

如果您不能立刻安装补丁或者升级，NSFOCUS建议您采取以下措施以降低威胁：

* 可以使用这个临时的补丁程序， 重新编译wuftp2.6.0

diff -ur wu-ftpd-orig/src/ftpcmd.y wu-ftpd-2.6.0/src/ftpcmd.y
--- wu-ftpd-orig/src/ftpcmd.y    Wed Oct 13 08:15:28 1999
+++ wu-ftpd-2.6.0/src/ftpcmd.y    Thu Jun 22 22:44:41 2000
@@ -1926,13 +1926,13 @@
     }
     if (!maxfound)
         maxlines = defmaxlines;
-    lreply(200, cmd);
+    lreply(200, "%s", cmd);
     while (fgets(buf, sizeof buf, cmdf)) {
         size_t len = strlen(buf);

         if (len > 0 && buf[len - 1] == '\n')
         buf[--len] = '\0';
-        lreply(200, buf);
+        lreply(200, "%s", buf);
         if (maxlines <= 0)
         ++lines;
         else if (++lines >= maxlines) {
diff -ur wu-ftpd-orig/src/ftpd.c wu-ftpd-2.6.0/src/ftpd.c
--- wu-ftpd-orig/src/ftpd.c    Thu Jun 22 22:23:40 2000
+++ wu-ftpd-2.6.0/src/ftpd.c    Thu Jun 22 22:45:23 2000
@@ -3157,7 +3157,7 @@
     reply(230, "User %s logged in.%s", pw->pw_name, guest ?
           "  Access restrictions apply." : "");
     sprintf(proctitle, "%s: %s", remotehost, pw->pw_name);
-    setproctitle(proctitle);
+    setproctitle("%s", proctitle);
     if (logging)
         syslog(LOG_INFO, "FTP LOGIN FROM %s, %s", remoteident, pw->pw_name);
/* H* mod: if non-anonymous user, copy it to "authuser" so everyone can
@@ -5912,7 +5912,7 @@

     remotehost[sizeof(remotehost) - 1] = '\0';
     sprintf(proctitle, "%s: connected", remotehost);
-    setproctitle(proctitle);
+    setproctitle("%s", proctitle);

     wu_authenticate();
/* Create a composite source identification string, to improve the logging

厂商补丁：

Caldera
-------
Caldera已经为此发布了一个安全公告（CSSA-2000-020.0）以及相应补丁:
CSSA-2000-020.0：wu-ftpd vulnerability
链接：http://www.caldera.com/support/security/advisories/CSSA-2000-020.0.txt

补丁下载：

OpenLinux Desktop 2.3

Location of Fixed Packages

The upgrade packages can be found on Caldera's FTP site at:
ftp://ftp.calderasystems.com/pub/updates/OpenLinux/2.3/current/RPMS/

The corresponding source code package can be found at:
ftp://ftp.calderasystems.com/pub/updates/OpenLinux/2.3/current/SRPMS

Verification

ddc86702f33d6a5edddab258ddd72195 RPMS/wu-ftpd-2.5.0-7.i386.rpm
8090110ecef8d1efd2fe4c279f209e29 SRPMS/wu-ftpd-2.5.0-7.src.rpm


OpenLinux eServer 2.3 and OpenLinux eBuilder for ECential 3.0

Location of Fixed Packages

The upgrade packages can be found on Caldera's FTP site at:
ftp://ftp.calderasystems.com/pub/updates/eServer/2.3/current/RPMS/

The corresponding source code package can be found at:
ftp://ftp.calderasystems.com/pub/updates/eServer/2.3/current/SRPMS

Verification

f909e8b47ec6780109c2437cdfdc2497 RPMS/wu-ftpd-2.5.0-7.i386.rpm
8354edf2f90e59aa96d8baf1d77e28a0 SRPMS/wu-ftpd-2.5.0-7.src.rpm

. OpenLinux eDesktop 2.4

Location of Fixed Packages

The upgrade packages can be found on Caldera's FTP site at:
ftp://ftp.calderasystems.com/pub/updates/eDesktop/2.4/current/RPMS/

The corresponding source code package can be found at:
ftp://ftp.calderasystems.com/pub/updates/eDesktop/2.4/current/SRPMS

Verification

d2df4fb386d65387039f33538571d907 RPMS/wu-ftpd-2.5.0-7.i386.rpm
13313d25d6d93dd98dd94e62d48c711c SRPMS/wu-ftpd-2.5.0-7.src.rpm

Conectiva
---------
Conectiva已经为此发布了一个安全公告（2000-06-23）以及相应补丁:
2000-06-23：Remote root compromise
链接：

补丁下载：

DIRECT DOWNLOAD LINKS TO UPDATED PACKAGES

ftp://ftp.conectiva.com.br/pub/conectiva/atualizacoes/4.0/i386/wu-ftpd-2.6.0-11cl.i386.rpm
ftp://ftp.conectiva.com.br/pub/conectiva/atualizacoes/4.0es/i386/wu-ftpd-2.6.0-11cl.i386.rpm
ftp://ftp.conectiva.com.br/pub/conectiva/atualizacoes/4.1/i386/wu-ftpd-2.6.0-11cl.i386.rpm
ftp://ftp.conectiva.com.br/pub/conectiva/atualizacoes/4.2/i386/wu-ftpd-2.6.0-11cl.i386.rpm
ftp://ftp.conectiva.com.br/pub/conectiva/atualizacoes/5.0/i386/wu-ftpd-2.6.0-11cl.i386.rpm
ftp://ftp.conectiva.com.br/pub/conectiva/atualizacoes/servidor-1.0/i386/wu-ftpd-2.6.0-11cl.i386.rpm


DIRECT LINK TO THE SOURCE PACKAGES
ftp://ftp.conectiva.com.br/pub/conectiva/atualizacoes/4.0/SRPMS/wu-ftpd-2.6.0-11cl.i386.rpm
ftp://ftp.conectiva.com.br/pub/conectiva/atualizacoes/4.0es/SRPMS/wu-ftpd-2.6.0-11cl.i386.rpm
ftp://ftp.conectiva.com.br/pub/conectiva/atualizacoes/4.1/SRPMS/wu-ftpd-2.6.0-11cl.i386.rpm
ftp://ftp.conectiva.com.br/pub/conectiva/atualizacoes/4.2/SRPMS/wu-ftpd-2.6.0-11cl.i386.rpm
ftp://ftp.conectiva.com.br/pub/conectiva/atualizacoes/5.0/SRPMS/wu-ftpd-2.6.0-11cl.i386.rpm
ftp://ftp.conectiva.com.br/pub/conectiva/atualizacoes/servidor-1.0/SRPMS/wu-ftpd-2.6.0-11cl.i386.rpm

Debian
------
Debian已经为此发布了一个安全公告（Debian-00-010）以及相应补丁:
Debian-00-010：New Debian wu-ftpd packages released
链接：http://www.debian.org/security/2000/debian-

补丁下载：

Source archives:
http://security.debian.org/dists/slink/updates/source/wu-ftpd-academ_2.4.2.16-13.1.diff.gz
http://security.debian.org/dists/slink/updates/source/wu-ftpd-academ_2.4.2.16-13.1.dsc
http://security.debian.org/dists/slink/updates/source/wu-ftpd-academ_2.4.2.16.orig.tar.gz

Intel ia32 architecture:
http://security.debian.org/dists/slink/updates/binary-i386/wu-ftpd-academ_2.4.2.16-13.1_i386.deb

Sun Sparc architecture:
http://security.debian.org/dists/slink/updates/binary-sparc/wu-ftpd-academ_2.4.2.16-13.1_sparc.deb

Debian 2.2 alias potato

Source archives:
http://security.debian.org/dists/potato/updates/main/source/wu-ftpd_2.6.0-5.1.diff.gz
http://security.debian.org/dists/potato/updates/main/source/wu-ftpd_2.6.0-5.1.dsc
http://security.debian.org/dists/potato/updates/main/source/wu-ftpd_2.6.0.orig.tar.gz

Architecture indendent archives:
http://security.debian.org/dists/potato/updates/main/binary-all/wu-ftpd-academ_2.6.0-5.1_all.deb


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

FreeBSD
-------
FreeBSD已经为此发布了一个安全公告（FreeBSD-SA-00:29）以及相应补丁:
FreeBSD-SA-00:29：wu-ftpd port contains remote root compromise [REVISED]
链接：ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-00:29.[需要添加].asc

补丁下载：

Patches are available for FreeBSD 3, 4 and 5 at:
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-3-stable/ftp/wu-ftpd-2.6.0.tar.gz
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/ftp/wu-ftpd-2.6.0.tar.gz
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-4-stable/ftp/wu-ftpd-2.6.0.tar.gz
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/ftp/wu-ftpd-2.6.0.tar.gz
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-5-current/ftp/wu-ftpd-2.6.0.tar.gz

HP
--
HP已经为此发布了一个安全公告（HPSBUX0007-117）以及相应补丁:
HPSBUX0007-117：Sec. Vulnerability in ftpd **Rev.04**
链接：

补丁下载：

ftp://us-ffs.external.hp.com/hp-ux_patches

HP HP-UX 10.0 1:

HP Patch PHNE_22058


HP HP-UX 10.10:

HP Patch PHNE_22058


HP HP-UX 10.16:

HP Patch PHNE_22703


HP HP-UX 10.20:

HP Patch PHNE_22057


HP HP-UX (VVOS) 10.24:

HP Patch PHNE_22059


HP HP-UX 10.26:

HP Patch PHNE_22124


HP HP-UX 11.0 4:

HP Patch PHNE_22060


HP HP-UX 11.0:

HP Patch PHNE_21936

补丁安装方法：

  1. 在安装补丁之前备份系统。

  2. 以root身份登录。
  
  3. 把patch复制到/tmp目录。
  
  4. 转到/tmp目录unshar补丁程序：
  
      cd /tmp
      sh PHCO_xxxxxx
  
  5a. 对一个单独的系统，运行swinstall来安装补丁：
  
      swinstall -x autoreboot=true -x match_target=true \
          -s /tmp/PHCO_xxxxx.depot
  
  默认情况下会把原来的软件备份到/var/adm/sw/patch/PHCO_xxxxx目录下。如果你不希望保留一个备份，可以创建一个空文件/var/adm/sw/patch/PATCH_NOSAVE，这样系统就不会再保留备份了。
  
  警告：当安装补丁的时候这个文件存在，补丁安装以后就不能卸载了，使用这个功能的时候必须小心。

RedHat
------
RedHat已经为此发布了一个安全公告（RHSA-2000:039-02）以及相应补丁:
RHSA-2000:039-02：remote root exploit (SITE EXEC) fixed
链接：https://www.redhat.com/support/errata/RHSA-2000-039.html

补丁下载：

Red Hat Linux 5.2:

386:
ftp://updates.redhat.com/5.2/i386/wu-ftpd-2.6.0-2.5.x.i386.rpm

alpha:
ftp://updates.redhat.com/5.2/alpha/wu-ftpd-2.6.0-2.5.x.alpha.rpm

sparc:
ftp://updates.redhat.com/5.2/sparc/wu-ftpd-2.6.0-2.5.x.sparc.rpm

sources:
ftp://updates.redhat.com/5.2/SRPMS/wu-ftpd-2.6.0-2.5.x.src.rpm

Red Hat Linux 6.2:

i386:
ftp://updates.redhat.com/6.2/i386/wu-ftpd-2.6.0-14.6x.i386.rpm

alpha:
ftp://updates.redhat.com/6.2/alpha/wu-ftpd-2.6.0-14.6x.alpha.rpm

sparc:
ftp://updates.redhat.com/6.2/sparc/wu-ftpd-2.6.0-14.6x.sparc.rpm

sources:
ftp://updates.redhat.com/6.2/SRPMS/wu-ftpd-2.6.0-14.6x.src.rpm

可使用下列命令安装补丁：

rpm -Fvh [文件名]

TurboLinux
----------
TurboLinux已经为此发布了一个安全公告（TLSA2000014-1）以及相应补丁:
TLSA2000014-1：wu-ftpd-2.6.0 and earlier
链接：

补丁下载：

TurboLinux Turbo Linux 3.5 b2:

TurboLinux RPM wu-ftpd-2.6.1-1.i386.rpm
ftp://ftp.turbolinux.com/pub/updates/4.0/security/wu-ftpd-2.6.1-1.i386.rpm

TurboLinux Turbo Linux 4.0:

TurboLinux RPM wu-ftpd-2.6.1-1.i386.rpm
ftp://ftp.turbolinux.com/pub/updates/4.0/security/wu-ftpd-2.6.1-1.i386.rpm

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