---
title: "CVE-2001-0010: tsig bug"
slug: "aa-00946"
description: "It is possible to overflow a buffer handling TSIG signed queries, thereby obtaining access to the system."
updated: 2014-10-28T08:53:00Z
published: 2014-10-28T08:53:00Z
---

> ## Documentation Index
> Fetch the complete documentation index at: https://kb.isc.org/llms.txt
> Use this file to discover all available pages before exploring further.

# CVE-2001-0010: tsig bug

It is possible to overflow a buffer handling TSIG signed queries, thereby obtaining access to the system.         
        




    
            
                      
              CVE: 


                    [CVE-2001-0010](http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2001-0010)        


        






    
            
                      
              CERT: 


                    [VU#196945](http://www.kb.cert.org/vuls/id/196945)        


        






    
            
                      
              Posting date: 


                    29 Jan 2001        


        






    
            
                      
              Program Impacted: 


                    [BIND](https://www.isc.org/software/bind)        


        






    
            
                      
              Versions affected: 


                    8.2 - prerelease versions of 8.2.3        


        






    
            
                      
              Severity: 


                    Critical        


        






    
            
                      
              Exploitable: 


                    Remotely        


        






      Description: 


    
            
                    During the processing of transaction signatures, 
BIND performs a test for signatures that fail to include a valid key. If
 a transaction signature is found in the request, but a valid key is not
 included, BIND skips normal processing of the request and jumps 
directly to code designed to send an error response. Because this code 
fails to initialize variables in the same manner as the normal 
processing, later function calls make invalid assumptions about the size
 of the request buffer. In particular, the code to add a new (valid) 
signature to the response may overflow the request buffer and overwrite 
adjacent memory on the stack or heap. Overwriting this memory can allow 
an intruder (in conjunction with other buffer overflow exploit 
techniques) to gain unauthorized access to the vulnerable system.


        


        






      Workarounds: 


    
            
                    None.


        


        






      Active exploits: 


    
            
                    Exploits for this bug exist.        


        






      Solution: 


    
            
                    Upgrade to BIND 8.2.3 or later.


        


        












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