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Vulnerability CVE-2018-16253
Published: 2018-11-07
| Description: |
In sig_verify() in x509.c in axTLS version 2.1.3 and before, the PKCS#1 v1.5 signature verification does not properly verify the ASN.1 metadata. Consequently, a remote attacker can forge signatures when small public exponents are being used, which could lead to impersonation through fake X.509 certificates. This is an even more permissive variant of CVE-2006-4790 and CVE-2014-1568. |
Type:
CWE-347 (Improper Verification of Cryptographic Signature)
CVSS2 => (AV:N/AC:M/Au:N/C:N/I:P/A:N)
| CVSS Base Score |
Impact Subscore |
Exploitability Subscore |
4.3/10 |
2.9/10 |
8.6/10 |
| Exploit range |
Attack complexity |
Authentication |
Remote |
Medium |
No required |
| Confidentiality impact |
Integrity impact |
Availability impact |
None |
Partial |
None |
References: |
https://github.com/igrr/axtls-8266/commit/5efe2947ab45e81d84b5f707c51d1c64be52f36c
https://sourceforge.net/p/axtls/mailman/message/36459928/
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