Owasp Error Handling
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introduce a variety of security problems for a web site. The most common problem is when detailed internal error messages such as stack traces,
Owasp Improper Error Handling
database dumps, and error codes are displayed to the user (hacker). owasp information leakage and improper error handling These messages reveal implementation details that should never be revealed. Such details can provide hackers important clues on application error message security vulnerability potential flaws in the site and such messages are also disturbing to normal users. Web applications frequently generate error conditions during normal operation. Out of memory, null pointer exceptions, system
Owasp Error Handling Cheat Sheet
call failure, database unavailable, network timeout, and hundreds of other common conditions can cause errors to be generated. These errors must be handled according to a well thought out scheme that will provide a meaningful error message to the user, diagnostic information to the site maintainers, and no useful information to an attacker. Even when error messages don’t provide a
Information Disclosure Owasp
lot of detail, inconsistencies in such messages can still reveal important clues on how a site works, and what information is present under the covers. For example, when a user tries to access a file that does not exist, the error message typically indicates, “file not found”. When accessing a file that the user is not authorized for, it indicates, “access denied”. The user is not supposed to know the file even exists, but such inconsistencies will readily reveal the presence or absence of inaccessible files or the site’s directory structure. One common security problem caused by improper error handling is the fail-open security check. All security mechanisms should deny access until specifically granted, not grant access until denied, which is a common reason why fail open errors occur. Other errors can cause the system to crash or consume significant resources, effectively denying or reducing service to legitimate users. Good error handling mechanisms should be able to handle any feasible set of inputs, while enforcing proper security. Simple error messages should be produced and logged so
Debug errors 6.3 Exception handling 6.4 Functional return values 7 Detailed error messages 7.1 How to determine if you are vulnerable 7.2 How to protect poor error handling server error message ( 10932 ) yourself 8 Logging 8.1 Where to log to? 8.2 Handling 8.3 General Debugging
Error Handling Best Practices
8.4 Forensics evidence 8.5 Attack detection 8.6 Quality of service 8.7 Proof of validity 8.8 Logging types 9 error message on page Noise 9.1 How to protect yourself 10 Cover Tracks 10.1 How to protect yourself 11 False Alarms 11.1 How to protect yourself 11.2 Denial of Service 11.3 How to protect yourself https://www.owasp.org/index.php/Improper_Error_Handling 12 Destruction 12.1 How to protect yourself 13 Audit Trails 13.1 How to determine if you are vulnerable 13.2 How to protect yourself 14 Further Reading 15 Error Handling and Logging Objective Many industries are required by legal and regulatory requirements to be: Auditable – all activities that affect user state or balances are formally tracked Traceable – it’s possible to https://www.owasp.org/index.php/Error_Handling,_Auditing_and_Logging determine where an activity occurs in all tiers of the application High integrity – logs cannot be overwritten or tampered with by local or remote users Well-written applications will dual-purpose logs and activity traces for audit and monitoring, and make it easy to track a transaction without excessive effort or access to the system. They should possess the ability to easily track or identify potential fraud or anomalies end-to-end. Environments Affected All. Relevant COBIT Topics DS11 – Manage Data – All sections should be reviewed, but in particular: DS11.4 Source data error handling DS11.8 Data input error handling Description Error handling, debug messages, auditing and logging are different aspects of the same topic: how to track events within an application: Best practices Fail safe – do not fail open Dual purpose logs Audit logs are legally protected – protect them Reports and search logs using a read-only copy or complete replica Error Handling Error handling takes two forms: structured exception handling and functional error checking. Structured exception handling is always preferred as it is easier to cover 100% of code. On the othe
Error https://www.owasp.org/index.php?title=Improper_Error_Handling&setlang=en HandlingR Return Inside Finally BlockU Unchecked Error Condition Retrieved from "http://www.owasp.org/index.php?title=Category:Error_Handling_Vulnerability&oldid=62770" Category: Vulnerability Navigation menu Personal tools Log inRequest account Namespaces Category error handling Discussion Variants Views Read View source View history Actions Search Navigation Home About OWASP Acknowledgements Advertising AppSec Events Books Brand Resources Chapters Donate to OWASP Downloads Funding Governance owasp error handling Initiatives Mailing Lists Membership Merchandise News Community portal Presentations Press Projects Video Volunteer Reference Activities Attacks Code Snippets Controls Glossary How To... Java Project .NET Project Principles Technologies Threat Agents Vulnerabilities Language English español Tools What links here Related changes Special pages Printable version Permanent link Page information This page was last modified on 27 May 2009, at 13:30. This page has been accessed 34,058 times. Content is available under a Creative Commons 3.0 License unless otherwise noted. Privacy policy About OWASP Disclaimers
introduce a variety of security problems for a web site. The most common problem is when detailed internal error messages such as stack traces, database dumps, and error codes are displayed to the user (hacker). These messages reveal implementation details that should never be revealed. Such details can provide hackers important clues on potential flaws in the site and such messages are also disturbing to normal users. Web applications frequently generate error conditions during normal operation. Out of memory, null pointer exceptions, system call failure, database unavailable, network timeout, and hundreds of other common conditions can cause errors to be generated. These errors must be handled according to a well thought out scheme that will provide a meaningful error message to the user, diagnostic information to the site maintainers, and no useful information to an attacker. Even when error messages don’t provide a lot of detail, inconsistencies in such messages can still reveal important clues on how a site works, and what information is present under the covers. For example, when a user tries to access a file that does not exist, the error message typically indicates, “file not found”. When accessing a file that the user is not authorized for, it indicates, “access denied”. The user is not supposed to know the file even exists, but such inconsistencies will readily reveal the presence or absence of inaccessible files or the site’s directory structure. One common security problem caused by improper error handling is the fail-open security check. All security mechanisms should deny access until specifically granted, not grant access until denied, which is a common reason why fail open errors occur. Other errors can cause the system to crash or consume significant resources, effectively denying or reducing service to legitimate users. Good error handling mechanisms should be able to handle any feasible set of inputs, while enforcing proper security. Simple error messages should be produced and logged so that their cause, whether an error in the site or a hacking attempt, can be reviewed. Error handling should not focus solely on input provided by the user, but should also include any errors that can be generated by internal components such as system calls, database queries, or any other internal functions. Environments Affected All web servers, application servers, and web application environments are susceptible to error handling problems. Examples and References OWASP Tes