gosaml2 vulnerable to Denial Of Service Via Deflate Decompression Bomb
### Impact 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. ### Mitigation 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. ### Patches This issue is addressed in v0.9.0
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2023-26483US | medium5.3 | — | ||
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 bu… | ||||
references
External citations — patches, advisories, analysis.
- https://github.com/russellhaering/gosaml2PACKAGE
- https://github.com/russellhaering/gosaml2/commit/f9d66040241093e8702649baff50cc70d2c683c0WEB
- https://github.com/russellhaering/gosaml2/releases/tag/v0.9.0WEB
- https://github.com/russellhaering/gosaml2/security/advisories/GHSA-6gc3-crp7-25w5WEB
- https://nvd.nist.gov/vuln/detail/CVE-2023-26483ADVISORY
- https://pkg.go.dev/vuln/GO-2023-1602WEB
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