CVE-2004-0461: DHCPD contains C Includes that sometimes defines vsnprintf() as vsprintf()
  • 30 May 2013
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CVE-2004-0461: DHCPD contains C Includes that sometimes defines vsnprintf() as vsprintf()

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Article Summary

DHCPD, when compiled in environments that do not provide the vsnprintf function, uses C include files that define vsnprintf to use the less safe vsprintf function

CVE: 

CVE-2004-0461    VU#654390

Posting date: 

22 Jun 2004

Program Impacted: 

DHCP

Versions affected: 

3.0.1rc12, 3.0.1rc13

Severity: 

Medium

Exploitable: 

Remotely

Description:

                ISC DHCP makes use of the vsnprintf() function 

for writing various log file strings. For systems that do not support vsnprintf(), a C include file was created that defines the vsnprintf() function to vsprintf() as such:

#define vsnprintf(buf, size, fmt, list) vsprintf (buf, fmt, list)

vsprintf() is a function that does not check bounds, therefore the size is discarded creating the potential for a buffer overflow when client provided data is supplied. Note that the vsnprintf() statements are defined after the vulnerable code that is discussed in VU#317350. This means that VU#317350 would be triggered prior to these potential buffer overflows, unless a client could specify content to a vsnprintf() statement not associated with logging. It is believed that there aren't any other vsnprintf() statements vulnerable to this type of exploitation.

Workarounds:

None.

Active exploits:

None known at this time.

Solution:  

Upgrade to a released version of ISC DHCPD.

Related Documents:

If you'd like more information on our Forum or product support please visit www.isc.org/support.

Do you still have questions?   Questions regarding this advisory should go to security-officer@isc.org

Note: ISC patches only currently supported versions. When possible we indicate EOL versions affected.

ISC Security Vulnerability Disclosure Policy:   Details of our current security advisory policy and practice can be found here: https://www.isc.org/security-vulnerability-disclosure-policy

This Knowledge Base article https://kb.isc.org/article/AA-00960 is the complete and official security advisory document.

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