Earle F. Philhower, III

3 exploits Active since Nov 2018
CVE-2018-16149 WRITEUP MEDIUM WRITEUP
axtls < 2.1.3 - Denial of Service via PKCS#1 v1.5 Signature Verification
In sig_verify() in x509.c in axTLS version 2.1.3 and before, the PKCS#1 v1.5 signature verification blindly trusts the declared lengths in the ASN.1 structure. Consequently, when small public exponents are being used, a remote attacker can generate purposefully crafted signatures (and put them on X.509 certificates) to induce illegal memory access and crash the verifier.
CVSS 5.9
CVE-2018-16150 WRITEUP MEDIUM WRITEUP
axtls < 2.1.3 - Cryptographic Signature Verification Bypass via PKCS#1 v1.5 Excess Data
In sig_verify() in x509.c in axTLS version 2.1.3 and before, the PKCS#1 v1.5 signature verification does not reject excess data after the hash value. 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 a variant of CVE-2006-4340.
CVSS 5.9
CVE-2018-16253 WRITEUP MEDIUM WRITEUP
axtls < 2.1.3 - Cryptographic Signature Verification Bypass via ASN.1 Metadata
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.
CVSS 5.9