GHSA-6gc3-crp7-25w5

gosaml2 vulnerable to Denial Of Service Via Deflate Decompression Bomb

Source: GitHub Advisory Database (reviewed) Moderate CVE-2023-26483

Packages

Ecosystem	Package	Affected	Fixed in
Go	github.com/russellhaering/gosaml2	< 0.9.0	0.9.0

Details

As written in the advisory (Markdown source, shown as plain text).

### 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

References

External links from the advisory. They lead to third-party sites.