---
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
canonical: "kb.isc.org/aa-00946"
stale: true
---

> ## 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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