Jwt Attack
CVE-2022-24884
HIGH
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Lifecycle Timeline
1DescriptionNVD
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.
AnalysisAI
ecdsautils is a tiny collection of programs used for ECDSA (keygen, sign, verify). Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity.
Technical ContextAI
This vulnerability is classified under CWE-347. 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. Affected products include: Ecdsautils Project Ecdsautils, Fedoraproject Fedora, Debian Debian Linux.
RemediationAI
A vendor patch is available. Apply the latest security update as soon as possible. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.
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External POC / Exploit Code
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