CVE-2023-49290

Public Exploit
Malicious parameters can cause a denial of service in lestrrat-go/jwx

Description

lestrrat-go/jwx is a Go module implementing various JWx (JWA/JWE/JWK/JWS/JWT, otherwise known as JOSE) technologies. A p2c parameter set too high in JWE's algorithm PBES2-* could lead to a denial of service. The JWE key management algorithms based on PBKDF2 require a JOSE Header Parameter called p2c (PBES2 Count). This parameter dictates the number of PBKDF2 iterations needed to derive a CEK wrapping key. Its primary purpose is to intentionally slow down the key derivation function, making password brute-force and dictionary attacks more resource- intensive. Therefore, if an attacker sets the p2c parameter in JWE to a very large number, it can cause a lot of computational consumption, resulting in a denial of service. This vulnerability has been addressed in commit `64f2a229b` which has been included in release version 1.2.27 and 2.0.18. Users are advised to upgrade. There are no known workarounds for this vulnerability.

Category

5.3
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.13%
Vendor Advisory github.com
Affected: lestrrat-go jwx
Published at:
Updated at:

References

Link Tags
https://github.com/lestrrat-go/jwx/security/advisories/GHSA-7f9x-gw85-8grf exploit vendor advisory
https://github.com/lestrrat-go/jwx/commit/64f2a229b8e18605f47361d292b526bdc4aee01c patch

Frequently Asked Questions

What is the severity of CVE-2023-49290?
CVE-2023-49290 has been scored as a medium severity vulnerability.
How to fix CVE-2023-49290?
To fix CVE-2023-49290, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2023-49290 being actively exploited in the wild?
It is possible that CVE-2023-49290 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2023-49290?
CVE-2023-49290 affects lestrrat-go jwx.
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