Vulnerabilities > CVE-2017-11142 - Resource Exhaustion vulnerability in PHP
Attack vector
NETWORK Attack complexity
LOW Privileges required
NONE Confidentiality impact
NONE Integrity impact
NONE Availability impact
HIGH Summary
In PHP before 5.6.31, 7.x before 7.0.17, and 7.1.x before 7.1.3, remote attackers could cause a CPU consumption denial of service attack by injecting long form variables, related to main/php_variables.c.
Vulnerable Configurations
Common Weakness Enumeration (CWE)
Common Attack Pattern Enumeration and Classification (CAPEC)
- XML Ping of the Death An attacker initiates a resource depletion attack where a large number of small XML messages are delivered at a sufficiently rapid rate to cause a denial of service or crash of the target. Transactions such as repetitive SOAP transactions can deplete resources faster than a simple flooding attack because of the additional resources used by the SOAP protocol and the resources necessary to process SOAP messages. The transactions used are immaterial as long as they cause resource utilization on the target. In other words, this is a normal flooding attack augmented by using messages that will require extra processing on the target.
- XML Entity Expansion An attacker submits an XML document to a target application where the XML document uses nested entity expansion to produce an excessively large output XML. XML allows the definition of macro-like structures that can be used to simplify the creation of complex structures. However, this capability can be abused to create excessive demands on a processor's CPU and memory. A small number of nested expansions can result in an exponential growth in demands on memory.
- Inducing Account Lockout An attacker leverages the security functionality of the system aimed at thwarting potential attacks to launch a denial of service attack against a legitimate system user. Many systems, for instance, implement a password throttling mechanism that locks an account after a certain number of incorrect log in attempts. An attacker can leverage this throttling mechanism to lock a legitimate user out of their own account. The weakness that is being leveraged by an attacker is the very security feature that has been put in place to counteract attacks.
- Violating Implicit Assumptions Regarding XML Content (aka XML Denial of Service (XDoS)) XML Denial of Service (XDoS) can be applied to any technology that utilizes XML data. This is, of course, most distributed systems technology including Java, .Net, databases, and so on. XDoS is most closely associated with web services, SOAP, and Rest, because remote service requesters can post malicious XML payloads to the service provider designed to exhaust the service provider's memory, CPU, and/or disk space. The main weakness in XDoS is that the service provider generally must inspect, parse, and validate the XML messages to determine routing, workflow, security considerations, and so on. It is exactly these inspection, parsing, and validation routines that XDoS targets. There are three primary attack vectors that XDoS can navigate Target CPU through recursion: attacker creates a recursive payload and sends to service provider Target memory through jumbo payloads: service provider uses DOM to parse XML. DOM creates in memory representation of XML document, but when document is very large (for example, north of 1 Gb) service provider host may exhaust memory trying to build memory objects. XML Ping of death: attack service provider with numerous small files that clog the system. All of the above attacks exploit the loosely coupled nature of web services, where the service provider has little to no control over the service requester and any messages the service requester sends.
Nessus
NASL family CGI abuses NASL id PHP_5_6_31.NASL description According to its banner, the version of PHP running on the remote web server is 5.6.x prior to 5.6.31. It is, therefore, affected by the following vulnerabilities : - An out-of-bounds read error exists in the PCRE library in the compile_bracket_matchingpath() function within file pcre_jit_compile.c. An unauthenticated, remote attacker can exploit this, via a specially crafted regular expression, to crash a process linked to the library, resulting in a denial of service condition. (CVE-2017-6004) - An out-of-bounds read error exists in the GD Graphics Library (LibGD) in the gdImageCreateFromGifCtx() function within file gd_gif_in.c when handling a specially crafted GIF file. An unauthenticated, remote attacker can exploit this to disclose sensitive memory contents or crash a process linked to the library. (CVE-2017-7890) - An out-of-bounds read error exists in Oniguruma in the match_at() function within file regexec.c. An unauthenticated, remote attacker can exploit this to disclose sensitive memory contents or crash a process linked to the library. (CVE-2017-9224) - An out-of-bounds write error exists in Oniguruma in the next_state_val() function during regular expression compilation. An unauthenticated, remote attacker can exploit this to execute arbitrary code. (CVE-2017-9226) - An out-of-bounds read error exists in Oniguruma in the mbc_enc_len() function within file utf8.c. An unauthenticated, remote attacker can exploit this to disclose memory contents or crash a process linked to the library. (CVE-2017-9227) - An out-of-bounds write error exists in Oniguruma in the bitset_set_range() function during regular expression compilation. An unauthenticated, remote attacker can exploit this to execute arbitrary code. (CVE-2017-9228) - An invalid pointer deference flaw exists in Oniguruma in the left_adjust_char_head() function within file regexec.c during regular expression compilation. An unauthenticated, remote attacker can exploit this to crash a process linked to the library, resulting in a denial of service condition. (CVE-2017-9229) - A denial of service condition exists in PHP when handling overlarge POST requests. An unauthenticated, remote attacker can exploit this to exhaust available CPU resources. (CVE-2017-11142) - An extended invalid free error exists in PHP in the php_wddx_push_element() function within file ext/wddx/wddx.c when parsing empty boolean tags. An unauthenticated, remote attacker can exploit this to cause a denial of service condition. (CVE-2017-11143) - A flaw exists in OpenSSL in the EVP_SealInit() function within file crypto/evp/p_seal.c due to returning an undocumented value of last seen 2020-06-01 modified 2020-06-02 plugin id 101525 published 2017-07-13 reporter This script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/101525 title PHP 5.6.x < 5.6.31 Multiple Vulnerabilities code # # (C) Tenable Network Security, Inc. # include("compat.inc"); if (description) { script_id(101525); script_version("1.14"); script_cvs_date("Date: 2019/03/04 18:17:59"); script_cve_id( "CVE-2017-6004", "CVE-2017-7890", "CVE-2017-9224", "CVE-2017-9226", "CVE-2017-9227", "CVE-2017-9228", "CVE-2017-9229", "CVE-2017-11142", "CVE-2017-11143", "CVE-2017-11144", "CVE-2017-11145", "CVE-2017-11628", "CVE-2017-12933" ); script_bugtraq_id( 96295, 99489, 99490, 99492, 99501, 99550, 99553, 99601, 99605, 100320, 100538, 101244 ); script_name(english:"PHP 5.6.x < 5.6.31 Multiple Vulnerabilities"); script_summary(english:"Checks the version of PHP."); script_set_attribute(attribute:"synopsis", value: "The version of PHP running on the remote web server is affected by multiple vulnerabilities."); script_set_attribute(attribute:"description", value: "According to its banner, the version of PHP running on the remote web server is 5.6.x prior to 5.6.31. It is, therefore, affected by the following vulnerabilities : - An out-of-bounds read error exists in the PCRE library in the compile_bracket_matchingpath() function within file pcre_jit_compile.c. An unauthenticated, remote attacker can exploit this, via a specially crafted regular expression, to crash a process linked to the library, resulting in a denial of service condition. (CVE-2017-6004) - An out-of-bounds read error exists in the GD Graphics Library (LibGD) in the gdImageCreateFromGifCtx() function within file gd_gif_in.c when handling a specially crafted GIF file. An unauthenticated, remote attacker can exploit this to disclose sensitive memory contents or crash a process linked to the library. (CVE-2017-7890) - An out-of-bounds read error exists in Oniguruma in the match_at() function within file regexec.c. An unauthenticated, remote attacker can exploit this to disclose sensitive memory contents or crash a process linked to the library. (CVE-2017-9224) - An out-of-bounds write error exists in Oniguruma in the next_state_val() function during regular expression compilation. An unauthenticated, remote attacker can exploit this to execute arbitrary code. (CVE-2017-9226) - An out-of-bounds read error exists in Oniguruma in the mbc_enc_len() function within file utf8.c. An unauthenticated, remote attacker can exploit this to disclose memory contents or crash a process linked to the library. (CVE-2017-9227) - An out-of-bounds write error exists in Oniguruma in the bitset_set_range() function during regular expression compilation. An unauthenticated, remote attacker can exploit this to execute arbitrary code. (CVE-2017-9228) - An invalid pointer deference flaw exists in Oniguruma in the left_adjust_char_head() function within file regexec.c during regular expression compilation. An unauthenticated, remote attacker can exploit this to crash a process linked to the library, resulting in a denial of service condition. (CVE-2017-9229) - A denial of service condition exists in PHP when handling overlarge POST requests. An unauthenticated, remote attacker can exploit this to exhaust available CPU resources. (CVE-2017-11142) - An extended invalid free error exists in PHP in the php_wddx_push_element() function within file ext/wddx/wddx.c when parsing empty boolean tags. An unauthenticated, remote attacker can exploit this to cause a denial of service condition. (CVE-2017-11143) - A flaw exists in OpenSSL in the EVP_SealInit() function within file crypto/evp/p_seal.c due to returning an undocumented value of '-1'. An unauthenticated, remote attacker can exploit this to cause an unspecified impact. (CVE-2017-11144) - An out-of-bounds read error exists in PHP in the php_parse_date() function within file ext/date/lib/parse_date.c. An unauthenticated, remote attacker can exploit this to disclose memory contents or cause a denial of service condition. (CVE-2017-11145) - An out-of-bounds read error exists in PHP in the finish_nested_data() function within file ext/standard/var_unserializer.re. An unauthenticated, remote attacker can exploit this to disclose memory contents or cause a denial of service condition. - An off-by-one overflow condition exists in PHP in the INI parsing API, specifically in the zend_ini_do_op() function within file Zend/zend_ini_parser.y, due to improper validation of user-supplied input. An unauthenticated, remote attacker can exploit this to cause a denial of service condition or the execution of arbitrary code. - A Heap buffer overread flaw in finish_nested_data while unserializing untrusted data could lead to an unspecified impact on the integrity of PHP. (CVE-2017-12933) - A stack-based buffer overflow in the zend_ini_do_op() function in Zend/zend_ini_parser.c could cause a denial of service or potentially allow executing code. (CVE-2017-11628) Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number." ); script_set_attribute(attribute:"see_also", value:"http://www.php.net/ChangeLog-5.php#5.6.31"); script_set_attribute(attribute:"solution", value: "Upgrade to PHP version 5.6.31 or later."); script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P"); script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C"); script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"); script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C"); script_set_attribute(attribute:"cvss_score_source", value:"CVE-2017-9224"); script_set_attribute(attribute:"exploitability_ease", value:"No exploit is required"); script_set_attribute(attribute:"exploit_available", value:"false"); script_set_attribute(attribute:"vuln_publication_date", value:"2016/12/23"); script_set_attribute(attribute:"patch_publication_date", value:"2017/07/06"); script_set_attribute(attribute:"plugin_publication_date", value:"2017/07/13"); script_set_attribute(attribute:"plugin_type", value:"remote"); script_set_attribute(attribute:"cpe", value:"cpe:/a:php:php"); script_end_attributes(); script_category(ACT_GATHER_INFO); script_family(english:"CGI abuses"); script_copyright(english:"This script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof."); script_dependencies("php_version.nasl"); script_require_keys("www/PHP"); script_require_ports("Services/www", 80); exit(0); } include("audit.inc"); include("global_settings.inc"); include("misc_func.inc"); include("http.inc"); include("webapp_func.inc"); port = get_http_port(default:80, php:TRUE); php = get_php_from_kb( port : port, exit_on_fail : TRUE ); version = php["ver"]; source = php["src"]; backported = get_kb_item('www/php/'+port+'/'+version+'/backported'); if (report_paranoia < 2 && backported) audit(AUDIT_BACKPORT_SERVICE, port, "PHP "+version+" install"); # Check that it is the correct version of PHP if (version =~ "^5(\.6)?$") audit(AUDIT_VER_NOT_GRANULAR, "PHP", port, version); if (version !~ "^5\.6\.") audit(AUDIT_NOT_DETECT, "PHP version 5.6.x", port); fix = "5.6.31"; if (ver_compare(ver:version, fix:fix, strict:FALSE) < 0) { report = '\n Version source : ' + source + '\n Installed version : ' + version + '\n Fixed version : ' + fix + '\n'; security_report_v4(port:port, extra:report, severity:SECURITY_HOLE); } else audit(AUDIT_LISTEN_NOT_VULN, "PHP", port, version);
NASL family SuSE Local Security Checks NASL id SUSE_SU-2017-2303-1.NASL description This update for php7 fixes the following issues : - CVE-2016-10397: parse_url() can be bypassed to return fake host. (bsc#1047454) - CVE-2017-11142: Remoteattackers could cause a CPU consumption denial of service attack by injectinglong form variables, related to main/php_variables. (bsc#1048100) - CVE-2017-11144: The opensslextension PEM sealing code did not check the return value of the OpenSSL sealingfunction, which could lead to a crash. (bsc#1048096) - CVE-2017-11145: Lack of bounds checks in timelib_meridian coud lead to information leak. (bsc#1048112) - CVE-2017-11146: Lack of bounds checks in timelib_meridian parse code could lead to information leak. (bsc#1048111) - CVE-2017-11147: The PHAR archive handler could beused by attackers supplying malicious archive files to crash the PHP interpreteror potentially disclose information. (bsc#1048094) - CVE-2017-11628: Stack-base dbuffer overflow in zend_ini_do_op() could lead to denial of service (bsc#1050726) - CVE-2017-7890: Buffer over-read from unitialized data in gdImageCreateFromGifCtx function could lead to denial of service (bsc#1050241) - CVE-2016-5766: Integer Overflow in _gd2GetHeader() resulting in heap overflow could lead to denial of service or code execution (bsc#986386) Other fixes : - Soap Request with References (bsc#1053645) - php7-pear should explicitly require php7-pear-Archive_Tar otherwise this dependency must be declared in every php7-pear-* package explicitly. [bnc#1052389] Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. last seen 2020-03-24 modified 2019-01-02 plugin id 120003 published 2019-01-02 reporter This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/120003 title SUSE SLES12 Security Update : php7 (SUSE-SU-2017:2303-1) NASL family SuSE Local Security Checks NASL id OPENSUSE-2017-994.NASL description This update for php7 fixes the following issues : - CVE-2016-10397: parse_url() can be bypassed to return fake host. (bsc#1047454) - CVE-2017-11142: Remoteattackers could cause a CPU consumption denial of service attack by injectinglong form variables, related to main/php_variables. (bsc#1048100) - CVE-2017-11144: The opensslextension PEM sealing code did not check the return value of the OpenSSL sealingfunction, which could lead to a crash. (bsc#1048096) - CVE-2017-11145: Lack of bounds checks in timelib_meridian coud lead to information leak. (bsc#1048112) - CVE-2017-11146: Lack of bounds checks in timelib_meridian parse code could lead to information leak. (bsc#1048111) - CVE-2017-11147: The PHAR archive handler could beused by attackers supplying malicious archive files to crash the PHP interpreteror potentially disclose information. (bsc#1048094) - CVE-2017-11628: Stack-base dbuffer overflow in zend_ini_do_op() could lead to denial of service (bsc#1050726) - CVE-2017-7890: Buffer over-read from uninitialized data in gdImageCreateFromGifCtx function could lead to denial of service (bsc#1050241) - CVE-2016-5766: Integer Overflow in _gd2GetHeader() resulting in heap overflow could lead to denial of service or code execution (bsc#986386) Other fixes : - Soap Request with References (bsc#1053645) - php7-pear should explicitly require php7-pear-Archive_Tar otherwise this dependency must be declared in every php7-pear-* package explicitly. [bnc#1052389] This update was imported from the SUSE:SLE-12:Update update project. last seen 2020-06-05 modified 2017-09-05 plugin id 102947 published 2017-09-05 reporter This script is Copyright (C) 2017-2020 Tenable Network Security, Inc. source https://www.tenable.com/plugins/nessus/102947 title openSUSE Security Update : php7 (openSUSE-2017-994) NASL family Debian Local Security Checks NASL id DEBIAN_DSA-4081.NASL description Several vulnerabilities were found in PHP, a widely-used open source general purpose scripting language : - CVE-2017-11142 Denial of service via overly long form variables - CVE-2017-11143 Invalid free() in wddx_deserialize() - CVE-2017-11144 Denial of service in openssl extension due to incorrect return value check of OpenSSL sealing function. - CVE-2017-11145 Out-of-bounds read in wddx_deserialize() - CVE-2017-11628 Buffer overflow in PHP INI parsing API - CVE-2017-12933 Buffer overread in finish_nested_data() - CVE-2017-16642 Out-of-bounds read in timelib_meridian() last seen 2020-06-01 modified 2020-06-02 plugin id 105664 published 2018-01-09 reporter This script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/105664 title Debian DSA-4081-1 : php5 - security update NASL family CGI abuses NASL id PHP_7_0_17.NASL description According to its banner, the version of PHP running on the remote web server is 7.0.x prior to 7.0.17. It is, therefore, affected by a denial of service condition in PHP when handling overlarge POST requests. An unauthenticated, remote attacker can exploit this to exhaust available CPU resources. Note that Nessus has not tested for these issues but has instead relied only on the application last seen 2020-06-01 modified 2020-06-02 plugin id 122537 published 2019-03-01 reporter This script is Copyright (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/122537 title PHP 7.0.x < 7.0.17 Denial of Service Vulnerability NASL family CGI abuses NASL id PHP_7_1_3.NASL description According to its banner, the version of PHP running on the remote web server is 7.1.x prior to 7.1.3. It is, therefore, affected by a denial of service condition in PHP when handling overlarge POST requests. An unauthenticated, remote attacker can exploit this to exhaust available CPU resources. Note that Nessus has not tested for these issues but has instead relied only on the application last seen 2020-06-01 modified 2020-06-02 plugin id 122541 published 2019-03-01 reporter This script is Copyright (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/122541 title PHP 7.1.x < 7.1.3 Denial of Service Vulnerability NASL family Misc. NASL id SECURITYCENTER_PHP_5_6_31.NASL description The Tenable SecurityCenter application installed on the remote host is missing a security patch. It is, therefore, affected by multiple vulnerabilities in the bundled version of PHP : - An out-of-bounds read error exists in the PCRE library in the compile_bracket_matchingpath() function within file pcre_jit_compile.c. An unauthenticated, remote attacker can exploit this, via a specially crafted regular expression, to crash a process linked to the library, resulting in a denial of service condition. (CVE-2017-6004) - An out-of-bounds read error exists in the GD Graphics Library (LibGD) in the gdImageCreateFromGifCtx() function within file gd_gif_in.c when handling a specially crafted GIF file. An unauthenticated, remote attacker can exploit this to disclose sensitive memory contents or crash a process linked to the library. (CVE-2017-7890) - An out-of-bounds read error exists in Oniguruma in the match_at() function within file regexec.c. An unauthenticated, remote attacker can exploit this to disclose sensitive memory contents or crash a process linked to the library. (CVE-2017-9224) - An out-of-bounds write error exists in Oniguruma in the next_state_val() function during regular expression compilation. An unauthenticated, remote attacker can exploit this to execute arbitrary code. (CVE-2017-9226) - An out-of-bounds read error exists in Oniguruma in the mbc_enc_len() function within file utf8.c. An unauthenticated, remote attacker can exploit this to disclose memory contents or crash a process linked to the library. (CVE-2017-9227) - An out-of-bounds write error exists in Oniguruma in the bitset_set_range() function during regular expression compilation. An unauthenticated, remote attacker can exploit this to execute arbitrary code. (CVE-2017-9228) - An invalid pointer deference flaw exists in Oniguruma in the left_adjust_char_head() function within file regexec.c during regular expression compilation. An unauthenticated, remote attacker can exploit this to crash a process linked to the library, resulting in a denial of service condition. (CVE-2017-9229) - A denial of service condition exists in PHP when handling overlarge POST requests. An unauthenticated, remote attacker can exploit this to exhaust available CPU resources. (CVE-2017-11142) - An extended invalid free error exists in PHP in the php_wddx_push_element() function within file ext/wddx/wddx.c when parsing empty boolean tags. An unauthenticated, remote attacker can exploit this to cause a denial of service condition. (CVE-2017-11143) - A flaw exists in OpenSSL in the EVP_SealInit() function within file crypto/evp/p_seal.c due to returning an undocumented value of last seen 2020-06-01 modified 2020-06-02 plugin id 103121 published 2017-09-12 reporter This script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/103121 title Tenable SecurityCenter PHP < 5.6.31 Multiple Vulnerabilities (TNS-2017-12
References
- https://github.com/php/php-src/commit/a15bffd105ac28fd0dd9b596632dbf035238fda3
- https://github.com/php/php-src/commit/0f8cf3b8497dc45c010c44ed9e96518e11e19fc3
- https://bugs.php.net/bug.php?id=73807
- http://php.net/ChangeLog-7.php
- http://php.net/ChangeLog-5.php
- http://openwall.com/lists/oss-security/2017/07/10/6
- http://www.securityfocus.com/bid/99601
- https://www.tenable.com/security/tns-2017-12
- https://www.debian.org/security/2018/dsa-4081
- https://security.netapp.com/advisory/ntap-20180112-0001/