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Cisco Bug: CSCus70693 - ASA 9.3.2 SSL doesn't work with error: %ASA-4-402123: CRYPTO:

Last Modified

Nov 08, 2016

Products (1)

  • Cisco ASA 5500-X Series Firewalls

Known Affected Releases

9.3(2)

Description (partial)

After upgrade to 9.3.2 SSL VPNs stop working.

Symptom:
SSL (either Web or AnyConnect cannot be establish) with the error from AnyConnect:
"Could not connect to server. Please verify Internet connectivity and server address."

In the DART:
Type        : Error
Source      : acvpnui

Description : Function: ConnectMgr::run
File: .\ConnectMgr.cpp
Line: 674
Invoked Function: ConnectMgr::initiateConnect
Return Code: -29622263 (0xFE3C0009)
Description: CONNECTMGR_ERROR_UNEXPECTED

This errors are seen:

"%ASA-4-402123: CRYPTO: The ASA hardware accelerator encountered an error (Invalid PKCS Type, Pad, or Length, code= 0x1B) while executing the command PKCS1 v1.5 RSA Decrypt with CRT (> 1024 bits) (0x202)."

These errors are seen while debugs enabled:
RC4-SHA / RC4-MD5
error:1415FFA5:SSL routines:SSL_accept:pkp error@ssl_engine.c:2838<mailto:error@ssl_engine.c:2838>

AES256-SHA / AES128-SHA / DES-CBC3-SHA
error:1415FFA5:SSL routines:SSL_accept:pkp error@ssl_engine.c:2639<mailto:error@ssl_engine.c:2639>

Tests:
+ AnyConnect 3.1.05160 uses TLS 1.0 - fails
+ AnyConnect 4.0.00057 uses TLS 1.2 - fails
+ with IE TLS 1.0 - fails
+ with IE TLS 1.1/1.2 - fails
+ with Mozilla Firefox TLS 1.0 - fails
but
+ Mozilla Firefox TLS 1.1/1.2 - work ok
+ Chrome also uses TLS 1.2 - works ok.

Conditions:
ASA running 9.3.2 (the issue is not seen on the 9.3.1)

Certificate with:
- RSA keys size: 2048 bits
- Signature Algorithm: sha256RSA
- Signature Hash Algorithm: sha256

It is not happening for all certificates, it has to be something specific in the certificate which hasn't been identified yet.
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