Last Modified: Apr 28, 2025
Affected Product(s):
BIG-IP LTM
Known Affected Versions:
12.0.0, 12.0.0 HF1, 12.0.0 HF2, 12.0.0 HF3, 12.0.0 HF4, 12.1.0, 12.1.0 HF1, 12.1.0 HF2, 12.1.1, 12.1.1 HF1, 12.1.1 HF2, 12.1.2, 12.1.2 HF1, 12.1.2 HF2, 12.1.3, 12.1.3.1, 12.1.3.2, 12.1.3.3, 12.1.3.4, 12.1.3.5, 12.1.3.6, 12.1.3.7, 12.1.4, 12.1.4.1, 12.1.5, 12.1.5.1, 12.1.5.2, 12.1.5.3, 12.1.6
Fixed In:
13.0.0
Opened: Aug 30, 2016 Severity: 3-Major Related Article:
K18133264
For PKCS#1, the SHA256 header should be: 30 31 30 0d 06 09 60 86 48 01 65 03 04 02 01 05 00 04 20. However, there might also be this alternate header: 30 2f 30 0b 06 09 60 86 48 01 65 03 04 02 01 04 20, Some implementation use the alternate. According to PKCS#1, the first one is used when producing signature, but both should be accepted when verifying signatures. In BIG-IP, SSL uses the 1st header: 30 31 30 0d 06 09 60 86 48 01 65 03 04 02 01 05 00 04 20, whereas crypto uses the 2nd header format for some cert verification: 30 2f 30 0b 06 09 60 86 48 01 65 03 04 02 01 04 20, which causes the inconsistent and signature verification fail.
SSL handshake fails because of certificate verification failure.
For some particular certificates, crypto uses alternative SHA prefix for verification.
None.
Added crypto codec support for PKCS 1 RSA padding that adds hash DER encoding.