Bug 1219837 (CVE-2023-6681)

Summary: VUL-0: CVE-2023-6681: python-jwcrypto: denial of service Via specifically crafted JWE
Product: [openSUSE] openSUSE Distribution Reporter: SMASH SMASH <smash_bz>
Component: SecurityAssignee: Michael Ströder <michael>
Status: NEW --- QA Contact: Security Team bot <security-team>
Severity: Normal    
Priority: P3 - Medium CC: stoyan.manolov
Version: Leap 15.6   
Target Milestone: ---   
Hardware: Other   
OS: Other   
URL: https://smash.suse.de/issue/393715/
Whiteboard:
Found By: Security Response Team Services Priority:
Business Priority: Blocker: ---
Marketing QA Status: --- IT Deployment: ---

Description SMASH SMASH 2024-02-12 14:14:13 UTC 
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 DOS attack

References:
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2023-6681
https://bugzilla.redhat.com/show_bug.cgi?id=2260843