RSA PKCS#1 decryption vulnerability with prepending zeros in jsrsasign
### Impact Jsrsasign supports RSA PKCS#1 v1.5 (i.e. RSAES-PKCS1-v1_5) and RSA-OAEP encryption and decryption. Its encrypted message is represented as BigInteger. When there is a valid encrypted message, a crafted message with prepending zeros can be decrypted by this vulnerability. - If you don't use RSA PKCS1-v1_5 or RSA-OAEP decryption, this vulnerability is not affected. - Risk to forge contents of encrypted message is very low. - Risk to raise memory corruption is low since jsrsasign uses BigInteger class. ### Patches Users using RSA PKCS1-v1_5 or RSA-OAEP decryption should upgrade to 8.0.18. ### Workarounds Reject RSA PKCS1-v1_5 or RSA-OAEP encrypted message with unnecessary prepending zeros. ### References https://nvd.nist.gov/vuln/detail/CVE-2020-14967 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-14967 https://vuldb.com/?id.157124 https://kjur.github.io/jsrsasign/api/symbols/KJUR.crypto.Cipher.html#.decrypt https://github.com/kjur/jsrsasign/issues/439
beschreibt (1)
Zugehörige CVEs.
| ID | Schweregrad | ausnutzbar | ||
|---|---|---|---|---|
| CVE-2020-14967US | critical9.8 | — | ||
An issue was discovered in the jsrsasign package before 8.0.18 for Node.js. Its RSA PKCS1 v1.5 decryption implementation does not detect ciphertext modification by prepending '\0'… | ||||
Referenzen
Externe Belege — Patches, Meldungen, Analysen.
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-14967WEB
- https://github.com/kjur/jsrsasignPACKAGE
- https://github.com/kjur/jsrsasign/issues/439WEB
- https://github.com/kjur/jsrsasign/releases/tag/8.0.17WEB
- https://github.com/kjur/jsrsasign/releases/tag/8.0.18WEB
- https://github.com/kjur/jsrsasign/security/advisories/GHSA-xxxq-chmp-67g4WEB
- https://kjur.github.io/jsrsasignWEB
- https://kjur.github.io/jsrsasign/api/symbols/KJUR.crypto.Cipher.html#.decryptWEB
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