DO NOT REPLY [Bug 35081] New: - buffer overrun in ssl_callback_SSLVerify_CRL( ) (ssl_engine_kernel.c)

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http://issues.apache.org/bugzilla/show_bug.cgi?id=35081

           Summary: buffer overrun in ssl_callback_SSLVerify_CRL( )
                    (ssl_engine_kernel.c)
           Product: Apache httpd-2.0
           Version: 2.0.54
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: critical
          Priority: P1
         Component: mod_ssl
        AssignedTo: bugs@httpd.apache.org
        ReportedBy: mstern@csc.com


I found a buffer overrun in ssl_callback_SSLVerify_CRL( ) - ssl_engine_kernel.c:
 
char buff[512]; /* should be plenty */
[...]
n = BIO_read(bio, buff, sizeof(buff));
buff[n] = '\0';
 
If there are more than 512 bytes, n=512, thus we write in buff[512].
We should use
    n = BIO_read(bio, buff, sizeof(buff) - 1);

This could lead to a system crash.

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