Bug 2082425 (CVE-2022-24884)

Summary: CVE-2022-24884 ecdsautils: Improper Verification of ECDSA Signatures
Product: [Other] Security Response Reporter: Avinash Hanwate <ahanwate>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Severity: urgent Docs Contact:
Priority: urgent    
Version: unspecifiedCC: felix
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Fixed In Version: ecdsautils 0.4.1 Doc Type: If docs needed, set a value
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Story Points: ---
Clone Of: Environment:
Last Closed: 2022-05-06 10:45:12 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Bug Depends On: 2082426, 2082427    
Bug Blocks:    

Description Avinash Hanwate 2022-05-06 06:41:15 UTC
ecdsautils is a tiny collection of programs used for ECDSA (keygen, sign, verify). `ecdsa_verify_[prepare_]legacy()` does not check whether the signature values `r` and `s` are non-zero. A signature consisting only of zeroes is always considered valid, making it trivial to forge signatures. Requiring multiple signatures from different public keys does not mitigate the issue: `ecdsa_verify_list_legacy()` will accept an arbitrary number of such forged signatures. Both the `ecdsautil verify` CLI command and the libecdsautil library are affected. The issue has been fixed in ecdsautils 0.4.1. All older versions of ecdsautils (including versions before the split into a library and a CLI utility) are vulnerable.


Comment 1 Avinash Hanwate 2022-05-06 06:41:36 UTC
Created ecdsautils tracking bugs for this issue:

Affects: epel-all [bug 2082426]
Affects: fedora-all [bug 2082427]

Comment 2 Product Security DevOps Team 2022-05-06 10:45:10 UTC
This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.