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Category:   Application (Generic)  >   PowerDNS Vendors:
PowerDNS Label Decompression Bug Lets Remote Users Deny Service
SecurityTracker Alert ID:  1032220
SecurityTracker URL:
CVE Reference:   CVE-2015-1868, CVE-2015-5470   (Links to External Site)
Updated:  Nov 2 2015
Original Entry Date:  May 1 2015
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): Recursor versions 3.5 and after; Authoritative Server versions 3.2 and after
Description:   A vulnerability was reported in PowerDNS. A remote user can cause denial of service conditions on the target system.

A remote user can send specially crafted DNS packets to trigger a flaw in the label decompression code and cause the target service to crash or consume excessive CPU resources.

This can also be triggered by specially crafted responses from a DNS server.

Aki Tuomi and Toshifumi Sakaguchi reported this vulnerability.

Impact:   A remote user can cause the target service to crash or consume excessive CPU resources.
Solution:   The vendor has issued a fix (Recursor versions 3.6.4 and 3.7.3; Authoritative Server versions 3.3.3 and 3.4.5, 3.3.3).

[Editor's note: On June 9, 2015, the vendor issued an updated fix, as the original fix (Recursor versions 3.6.3 and 3.7.2; Authoritative Server versions 3.3.2 and 3.4.4) was incomplete [CVE-2015-5470].]

The vendor's advisory is available at:

Vendor URL: (Links to External Site)
Cause:   State error
Underlying OS:  Linux (Any), UNIX (Any), Windows (Any)

Message History:   None.

 Source Message Contents

[Original Message Not Available for Viewing]

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