CVE-2023-28119 crewjam/saml vulnerable to Denial Of Service Via Deflate Decompression Bomb

What is CVE-2023-28119?

CVE-2023-28119 is a high-severity denial of service vulnerability in crewjam saml, published on 22 Mar 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

The crewjam/saml go library contains a partial implementation of the SAML standard in golang. Prior to version 0.4.13, the package's use of `flate.NewReader` does not limit the size of the input. The user can pass more than 1 MB of data in the HTTP request to the processing functions, which will be decompressed server-side using the Deflate algorithm. Therefore, after repeating the same request multiple times, it is possible to achieve a reliable crash since the operating system kills the process. This issue is patched in version 0.4.13.

Weakness: CWE-770

Which versions are affected by CVE-2023-28119?

3 open source packages ship an affected version, including github.com/crewjam/saml. It affects 1 product.

Products include Saml Project Saml.

How do I fix CVE-2023-28119?

Upgrade github.com/crewjam/saml to 0.4.13 or later.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2023-28119 being exploited?

There is no known exploitation of CVE-2023-28119 in the wild and no public exploit code.

Other vulnerabilities in crewjam saml

• CVE-2022-41912 crewjam/saml go library is vulnerable to signature bypass via multiple Assertion elements Critical 9.1
• CVE-2023-45683 Cross site scripting via missing binding syntax validation In ACS location in github.com/crewjam/saml High 7.1

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-5mqj-xc49-246p, GO-2023-1664, UBUNTU-CVE-2023-28119.