GHSA-3pgj-pg6c-r5p7

Dashboard / Vulnerabilities / GHSA-3pgj-pg6c-r5p7

GHSA-3pgj-pg6c-r5p7

Summary: OAuthLib vulnerable to DoS when attacker provides malicious IPV6 URI

Details: ### Impact - Attacker providing malicious redirect uri can cause DoS to oauthlib's web application. - Attacker can also leverage usage of `uri_validate` functions depending where it is used. _What kind of vulnerability is it? Who is impacted?_ Oauthlib applications using OAuth2.0 provider support or use directly `uri_validate` function. ### Patches _Has the problem been patched? What versions should users upgrade to?_ Issue fixed in 3.2.2 release. ### Workarounds _Is there a way for users to fix or remediate the vulnerability without upgrading?_ The `redirect_uri` can be verified in web toolkit (i.e `bottle-oauthlib`, `django-oauth-toolkit`, ...) before oauthlib is called. A sample check if `:` is present to reject the request can prevent the DoS, assuming no port or IPv6 is fundamentally required. ### References Attack Vector: - Attacker providing malicious redirect uri: https://github.com/oauthlib/oauthlib/blob/d4bafd9f1d0eba3766e933b1ac598cbbf37b8914/oauthlib/oauth2/rfc6749/grant_types/base.py#L232 - Vulnerable `uri_validate` functions: https://github.com/oauthlib/oauthlib/blob/2b8a44855a51ad5a5b0c348a08c2564a2e197ea2/oauthlib/uri_validate.py ### PoC ```python is_absolute_uri("http://[:::::::::::::::::::::::::::::::::::::::]/path") ``` ### Acknowledgement Special thanks to Sebastian Chnelik - PyUp.io

References: https://github.com/oauthlib/oauthlib/security/advisories/GHSA-3pgj-pg6c-r5p7, https://nvd.nist.gov/vuln/detail/CVE-2022-36087, https://github.com/oauthlib/oauthlib/commit/2e40b412c844ecc4673c3fa3f72181f228bdbacd, https://github.com/oauthlib/oauthlib, https://github.com/oauthlib/oauthlib/blob/2b8a44855a51ad5a5b0c348a08c2564a2e197ea2/oauthlib/uri_validate.py, https://github.com/oauthlib/oauthlib/blob/d4bafd9f1d0eba3766e933b1ac598cbbf37b8914/oauthlib/oauth2/rfc6749/grant_types/base.py#L232, https://github.com/oauthlib/oauthlib/releases/tag/v3.2.1, https://github.com/pypa/advisory-database/tree/main/vulns/oauthlib/PYSEC-2022-269.yaml, https://lists.fedoraproject.org/archives/list/[email protected]/message/LXOPIA6M57CFQPUT6HHSNXCTV6QA3UDI, https://lists.fedoraproject.org/archives/list/[email protected]/message/NBCQJR3ZF7FVNTJYRVPVSQEQRAYZIUHU, https://lists.fedoraproject.org/archives/list/[email protected]/message/QRYLYHE5HWF6R2CRLJFUK4PILR47WXOE, https://lists.fedoraproject.org/archives/list/[email protected]/message/X2CQZM5CKOUM4GW2GTAPQEQFPITQ6F7S