IBM Support

IJ47941: STRICT ENFORCEMENT OF RFC 5246 - TLS 1.2 SECTION 7.4.1.4.1. SIGNATURE ALGORITHMS

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APAR status

  • Closed as program error.

Error description

  • Error Message: N/A
.
Stack Trace: N/A
.
All certificates in the server's certificate chain are not
validated to ensure compliance with the client's signature
extension

Local fix

  • 



Problem summary


    

  • Many implementations do not follow a strict enforcement of RFC
5246 - TLS 1.2 Section 7.4.1.4.1. Signature Algorithms. Oracle's
implementation and therefore, IBM's implementation do not
validate that the entire server's certificate and its chain are
in compliance with the signature extension that the client sent.
Due to the incompatibility nature of such a change and the
breakage which can ensue, a system property will be added, where
the user can enable if they want strict compliance. Otherwise,
the behavior will be unchanged.
com.ibm.jsse2.strictServerSigCheck = true <PIPE> false
   default - false - do not verify that server's certificate
chain matches client's signature constraint
   true - validate that server's certificate chain is in
compliance with client's signature algorithm extension

    



Problem conclusion


    

  • Binary affected - ibmjsseprovider2.jar
GIT Issue - #281
RTC - 149627
Build - 8.0 build_20230815--93
Build - FIPS140-3 Tech Preview - 8.0 build_20230815--96
JVM to be delivered in - JDK 8 SR8FP15
.
This APAR will be fixed in the following Releases:
.
IBM SDK, Java Technology Edition
   8    SR8 FP15  (8.0.8.15)
.
Contact your IBM Product's Service Team for these Service
Refreshes and Fix Packs.
For those running stand-alone, information about the available
maintenance can be found at:
           https://www.ibm.com/support/pages/java-sdk

    



Temporary fix


    

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IJ47941
    • 

  • Reported component name
    SECURITY
    • 

  • Reported component ID
    620700125
    • 

  • Reported release
    270
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt / Xsystem
    • 

  • Submitted date
    2023-08-19
    • 

  • Closed date
    2023-08-23
    • 

  • Last modified date
    2023-08-23
    • 





    

  • APAR is sysrouted FROM one or more of the following:
    

    • 

  • APAR is sysrouted TO one or more of the following:
    

    • 



Fix information


    

  • Fixed component name
    SECURITY
    • 

  • Fixed component ID
    620700125
    • 



Applicable component levels


    








      
              
                            

              

              [{"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SSNVBF","label":"Runtimes for Java Technology"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"270","Line of Business":{"code":"LOB36","label":"IBM Automation"}}]
              

                          

          
 
        

      

    

      

        

          

            
Document Information


            

            


                        

            Modified date:
            

            24 August 2023
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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