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Vulnerability · Published Mar 3, 2023 · Assigned by GitHub_M

CVE-2023-26483gosaml2 vulnerable to Denial of Service via deflate decompression bomb

Medium 5.3

In plain English

A medium-severity security flaw in gosaml2 from russellhaering. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.0% (higher than 62% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)1.0%top 38.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Gogithub.com/russellhaering/gosaml20.9.0GHSA-6gc3-crp7-25w5
Gogithub.com/russellhaering/gosaml20.9.0GO-2023-1602

Affected products (as reported)

VendorProductVersions
russellhaering gosaml2 < 0.9.0

Weakness: CWE-409 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

References