Vulnerability CVE-2023-26483
Published: 2023-03-03   Modified: 2023-03-04

Description:
gosaml2 is a Pure Go implementation of SAML 2.0. SAML Service Providers using this library for SAML authentication support are likely susceptible to Denial of Service attacks. A bug in this library enables attackers to craft a `deflate`-compressed request which will consume significantly more memory during processing than the size of the original request. This may eventually lead to memory exhaustion and the process being killed. The maximum compression ratio achievable with `deflate` is 1032:1, so by limiting the size of bodies passed to gosaml2, limiting the rate and concurrency of calls, and ensuring that lots of memory is available to the process it _may_ be possible to help Go's garbage collector "keep up". Implementors are encouraged not to rely on this. This issue is fixed in version 0.9.0.

Type:

CWE-409

 (Improper Handling of Highly Compressed Data (Data Amplification))

 References:
https://github.com/russellhaering/gosaml2/commit/f9d66040241093e8702649baff50cc70d2c683c0
https://github.com/russellhaering/gosaml2/security/advisories/GHSA-6gc3-crp7-25w5
https://github.com/russellhaering/gosaml2/releases/tag/v0.9.0
https://pkg.go.dev/vuln/GO-2023-1602
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