ID CVE-2018-20768
Summary An issue was discovered on Xerox WorkCentre 3655, 3655i, 58XX, 58XXi, 59XX, 59XXi, 6655, 6655i, 72XX, 72XXi, 78XX, 78XXi, 7970, 7970i, EC7836, and EC7856 devices before R18-05 073.xxx.0487.15000. An attacker can execute PHP code by leveraging a writable file.
References
Vulnerable Configurations
  • cpe:2.3:h:xerox:workcentre_3655i
    cpe:2.3:h:xerox:workcentre_3655i
  • cpe:2.3:h:xerox:workcentre_3655
    cpe:2.3:h:xerox:workcentre_3655
  • cpe:2.3:h:xerox:workcentre_5890i
    cpe:2.3:h:xerox:workcentre_5890i
  • cpe:2.3:h:xerox:workcentre_5865i
    cpe:2.3:h:xerox:workcentre_5865i
  • cpe:2.3:h:xerox:workcentre_5875i
    cpe:2.3:h:xerox:workcentre_5875i
  • cpe:2.3:h:xerox:workcentre_5845
    cpe:2.3:h:xerox:workcentre_5845
  • cpe:2.3:h:xerox:workcentre_5865
    cpe:2.3:h:xerox:workcentre_5865
  • cpe:2.3:h:xerox:workcentre_5875
    cpe:2.3:h:xerox:workcentre_5875
  • cpe:2.3:h:xerox:workcentre_5890
    cpe:2.3:h:xerox:workcentre_5890
  • cpe:2.3:h:xerox:workcentre_5900
    cpe:2.3:h:xerox:workcentre_5900
  • cpe:2.3:h:xerox:workcentre_5900i
    cpe:2.3:h:xerox:workcentre_5900i
  • cpe:2.3:h:xerox:workcentre_6655
    cpe:2.3:h:xerox:workcentre_6655
  • cpe:2.3:h:xerox:workcentre_6655i
    cpe:2.3:h:xerox:workcentre_6655i
  • cpe:2.3:h:xerox:workcentre_7855
    cpe:2.3:h:xerox:workcentre_7855
  • Xerox WorkCentre 7225
    cpe:2.3:h:xerox:workcentre_7225
  • cpe:2.3:h:xerox:workcentre_7220
    cpe:2.3:h:xerox:workcentre_7220
  • cpe:2.3:h:xerox:workcentre_7220i
    cpe:2.3:h:xerox:workcentre_7220i
  • cpe:2.3:h:xerox:workcentre_7225i
    cpe:2.3:h:xerox:workcentre_7225i
  • cpe:2.3:h:xerox:workcentre_7855i
    cpe:2.3:h:xerox:workcentre_7855i
  • cpe:2.3:h:xerox:workcentre_7845i
    cpe:2.3:h:xerox:workcentre_7845i
  • cpe:2.3:h:xerox:workcentre_7835i
    cpe:2.3:h:xerox:workcentre_7835i
  • cpe:2.3:h:xerox:workcentre_7830i
    cpe:2.3:h:xerox:workcentre_7830i
  • cpe:2.3:h:xerox:workcentre_7830
    cpe:2.3:h:xerox:workcentre_7830
  • cpe:2.3:h:xerox:workcentre_7835
    cpe:2.3:h:xerox:workcentre_7835
  • cpe:2.3:h:xerox:workcentre_7845
    cpe:2.3:h:xerox:workcentre_7845
  • cpe:2.3:h:xerox:workcentre_7970
    cpe:2.3:h:xerox:workcentre_7970
  • cpe:2.3:h:xerox:workcentre_7970i
    cpe:2.3:h:xerox:workcentre_7970i
  • cpe:2.3:h:xerox:workcentre_ec7836
    cpe:2.3:h:xerox:workcentre_ec7836
  • cpe:2.3:h:xerox:workcentre_ec7856
    cpe:2.3:h:xerox:workcentre_ec7856
CVSS
Base: 7.5
Impact:
Exploitability:
CWE CWE-94
CAPEC
  • Leverage Executable Code in Non-Executable Files
    An attack of this type exploits a system's trust in configuration and resource files, when the executable loads the resource (such as an image file or configuration file) the attacker has modified the file to either execute malicious code directly or manipulate the target process (e.g. application server) to execute based on the malicious configuration parameters. Since systems are increasingly interrelated mashing up resources from local and remote sources the possibility of this attack occurring is high. The attack can be directed at a client system, such as causing buffer overrun through loading seemingly benign image files, as in Microsoft Security Bulletin MS04-028 where specially crafted JPEG files could cause a buffer overrun once loaded into the browser. Another example targets clients reading pdf files. In this case the attacker simply appends javascript to the end of a legitimate url for a pdf (http://www.gnucitizen.org/blog/danger-danger-danger/) http://path/to/pdf/file.pdf#whatever_name_you_want=javascript:your_code_here The client assumes that they are reading a pdf, but the attacker has modified the resource and loaded executable javascript into the client's browser process. The attack can also target server processes. The attacker edits the resource or configuration file, for example a web.xml file used to configure security permissions for a J2EE app server, adding role name "public" grants all users with the public role the ability to use the administration functionality. The server trusts its configuration file to be correct, but when they are manipulated, the attacker gains full control.
  • Manipulating User-Controlled Variables
    This attack targets user controlled variables (DEBUG=1, PHP Globals, and So Forth). An attacker can override environment variables leveraging user-supplied, untrusted query variables directly used on the application server without any data sanitization. In extreme cases, the attacker can change variables controlling the business logic of the application. For instance, in languages like PHP, a number of poorly set default configurations may allow the user to override variables.
refmap via4
confirm https://securitydocs.business.xerox.com/wp-content/uploads/2018/07/cert_Security_Mini_Bulletin_XRX18Y_for_ConnectKey_EC78xx_v1.0.pdf
Last major update 10-02-2019 - 12:29
Published 10-02-2019 - 12:29
Last modified 13-02-2019 - 09:16
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