#inputvalidation — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #inputvalidation, aggregated by home.social.
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Web Security Series #14 — Blind Command Injection Exploitation
This article discusses a Blind Command Injection (BCI) vulnerability in an unnamed web application. The root cause was the lack of input validation for the search field, which accepted user-supplied URLs without filtering malicious parameters such as '; command=ls'. This blind command injection allowed attackers to execute operating system commands by sending specially crafted payloads through the compromised search functionality. The researcher used a combination of Burp Suite's Intruder and Repeater tools to identify and exploit this vulnerability. The mechanism behind the flaw was the application interpreting these malicious commands as separate requests, returning error messages that could be interpreted by the attacker. The impact included potential unauthorized access and information disclosure (e.g., listing files using 'ls' command). The bounty amount or program response were not mentioned in the article. To remediate this issue, proper input validation must be implemented for user-supplied URLs, and servers should not execute external commands based on user input. Key lesson: Input validation is crucial for preventing Blind Command Injection attacks #BugBounty #WebSecurity #CommandInjection #InputValidation #Infosec -
Web Security Series #14 — Blind Command Injection Exploitation
This article discusses a Blind Command Injection (BCI) vulnerability in an unnamed web application. The root cause was the lack of input validation for the search field, which accepted user-supplied URLs without filtering malicious parameters such as '; command=ls'. This blind command injection allowed attackers to execute operating system commands by sending specially crafted payloads through the compromised search functionality. The researcher used a combination of Burp Suite's Intruder and Repeater tools to identify and exploit this vulnerability. The mechanism behind the flaw was the application interpreting these malicious commands as separate requests, returning error messages that could be interpreted by the attacker. The impact included potential unauthorized access and information disclosure (e.g., listing files using 'ls' command). The bounty amount or program response were not mentioned in the article. To remediate this issue, proper input validation must be implemented for user-supplied URLs, and servers should not execute external commands based on user input. Key lesson: Input validation is crucial for preventing Blind Command Injection attacks #BugBounty #WebSecurity #CommandInjection #InputValidation #Infosec -
How I Found a Critical IDOR Leading to Account Takeover in Two EdTech Platforms
The vulnerability was an Insecure Direct Object Reference (IDOR) in two EdTech platforms, allowing account takeover through user profile manipulation. The flaw resulted from improper input validation, leading to user profiles being accessible via URL parameters. By constructing carefully crafted URLs containing other users' IDs, the researcher accessed their profiles without proper authentication. The attack vector involved using Burp Suite's Intruder tool to automate IDOR requests, sending payloads with incremental user IDs. The mechanism revolved around the application trusting the provided IDs without verifying their ownership or performing proper authorization checks. This IDOR flaw enabled the researcher to impersonate other users, potentially causing serious account takeovers. The researcher did not disclose specific bounty amounts or program responses. Proper mitigation requires implementing strict input validation and enforcing proper access control checks. Key lesson: Always validate user inputs and enforce proper access control to prevent unauthorized data access. #BugBounty #Cybersecurity #WebSecurity #IDOR #AccountTakeover #InputValidation -
How I Found a Critical IDOR Leading to Account Takeover in Two EdTech Platforms
The vulnerability was an Insecure Direct Object Reference (IDOR) in two EdTech platforms, allowing account takeover through user profile manipulation. The flaw resulted from improper input validation, leading to user profiles being accessible via URL parameters. By constructing carefully crafted URLs containing other users' IDs, the researcher accessed their profiles without proper authentication. The attack vector involved using Burp Suite's Intruder tool to automate IDOR requests, sending payloads with incremental user IDs. The mechanism revolved around the application trusting the provided IDs without verifying their ownership or performing proper authorization checks. This IDOR flaw enabled the researcher to impersonate other users, potentially causing serious account takeovers. The researcher did not disclose specific bounty amounts or program responses. Proper mitigation requires implementing strict input validation and enforcing proper access control checks. Key lesson: Always validate user inputs and enforce proper access control to prevent unauthorized data access. #BugBounty #Cybersecurity #WebSecurity #IDOR #AccountTakeover #InputValidation -
Logic Flaw in Meta Account Center: The Case of the Silent Patched Disavow Flow
This vulnerability is an Input Validation issue that enabled Sensitive Data Disclosure through the Meta Account Center. The root cause stems from a lack of input validation on the 'disavow' feature, which accepts URLs without proper filtering or validation. The researcher discovered this by submitting a crafted URL containing a base64-encoded payload (base64:php%20info()) to the disavow form. The payload was decoded on the server-side, leading to remote code execution and server information disclosure. The attacker could have gained access to sensitive data such as user session tokens, account credentials, or internal server data. After reporting the issue, Meta patched the vulnerability silently without a public disclosure or bounty payout. Proper remediation involves implementing input validation and sanitization for user-supplied URLs and sensitive data. Key lesson: Always validate and sanitize user inputs to prevent sensitive data disclosure or unauthorized access. #BugBounty #Cybersecurity #InputValidation #DataDisclosure #WebSecurity -
Logic Flaw in Meta Account Center: The Case of the Silent Patched Disavow Flow
This vulnerability is an Input Validation issue that enabled Sensitive Data Disclosure through the Meta Account Center. The root cause stems from a lack of input validation on the 'disavow' feature, which accepts URLs without proper filtering or validation. The researcher discovered this by submitting a crafted URL containing a base64-encoded payload (base64:php%20info()) to the disavow form. The payload was decoded on the server-side, leading to remote code execution and server information disclosure. The attacker could have gained access to sensitive data such as user session tokens, account credentials, or internal server data. After reporting the issue, Meta patched the vulnerability silently without a public disclosure or bounty payout. Proper remediation involves implementing input validation and sanitization for user-supplied URLs and sensitive data. Key lesson: Always validate and sanitize user inputs to prevent sensitive data disclosure or unauthorized access. #BugBounty #Cybersecurity #InputValidation #DataDisclosure #WebSecurity -
IDOR Mastery: From Basic ID Changes to Advanced Techniques That Pay $10K+ Bounties
This article details Insecure Direct Object Reference (IDOR) exploitation techniques, some resulting in $10,000+ bug bounty payouts. The root cause of these vulnerabilities lies in developers not validating user-controlled inputs when accessing other users' data, leading to unauthorized access and data disclosure. The researcher demonstrated various IDOR techniques using simple ID swapping and advanced methods like time-based and content-based blind IDOR, as well as chaining IDOR with other vulnerabilities. These techniques allow attackers to manipulate and access data they should not have access to. The payout amounts ranged from $1,000 to $15,000, with programs responding quickly and taking the vulnerabilities seriously. Remediation includes input validation, access control, and authorization checks. Key lesson: Always validate user-controlled inputs when accessing other users' data to prevent IDOR vulnerabilities. #BugBounty #WebSecurity #IDOR #Cybersecurity #InputValidation -
IDOR Mastery: From Basic ID Changes to Advanced Techniques That Pay $10K+ Bounties
This article details Insecure Direct Object Reference (IDOR) exploitation techniques, some resulting in $10,000+ bug bounty payouts. The root cause of these vulnerabilities lies in developers not validating user-controlled inputs when accessing other users' data, leading to unauthorized access and data disclosure. The researcher demonstrated various IDOR techniques using simple ID swapping and advanced methods like time-based and content-based blind IDOR, as well as chaining IDOR with other vulnerabilities. These techniques allow attackers to manipulate and access data they should not have access to. The payout amounts ranged from $1,000 to $15,000, with programs responding quickly and taking the vulnerabilities seriously. Remediation includes input validation, access control, and authorization checks. Key lesson: Always validate user-controlled inputs when accessing other users' data to prevent IDOR vulnerabilities. #BugBounty #WebSecurity #IDOR #Cybersecurity #InputValidation