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CVE-2001-0010: tsig bug
Author: Cathy Almond Reference Number: AA-00946 Views: 1852 Created: 2013-05-29 13:57 Last Updated: 2014-10-28 13:53 0 Rating/ Voters

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

CVE: 
CVE-2001-0010
CERT
VU#196945
Posting date: 
29 Jan 2001
Program Impacted: 
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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