/ 
Net-DNS-0.49
/ Net::DNS::RR::TKEY
Security Advisories (5)
CVE-2007-6341 (2008-02-08)

Allows remote attackers to cause a denial of service (program "croak") via a crafted DNS response.

CVE-2007-3409 (2007-06-26)

Net::DNS before 0.60, a Perl module, allows remote attackers to cause a denial of service (stack consumption) via a malformed compressed DNS packet with self-referencing pointers, which triggers an infinite loop.

CVE-2007-3377 (2007-06-25)

Header.pm in Net::DNS before 0.60, a Perl module, (1) generates predictable sequence IDs with a fixed increment and (2) can use the same starting ID for all child processes of a forking server, which allows remote attackers to spoof DNS responses, as originally reported for qpsmtp and spamassassin.

CVE-2026-64193 (2026-07-20)

Net::DNS versions through 1.55 for Perl allow remote execution injection via EDNS EXTENDED ERROR. Net::DNS::RR::OPT::EXTENDED_ERROR::_decompose parses the EXTRA-TEXT field of an EDNS EXTENDED-ERROR option (RFC 8914) by tokenising the raw bytes and passing the result to Perl's eval. There is some escaping done for $ and @, but not for backticks. This can be exploited for command execution if $pkt->edns->option('EXTENDED-ERROR') is called in array context, for example with a payload of {0:`"<command>"`} in EXTRA-TEXT.

CVE-2026-64194 (2026-07-20)

Net::DNS versions through 1.55 for Perl allow Denial of Service via deep DNS compression pointer chains. Net::DNS::DomainName::decode follows RFC 1035 compression pointers by recursing into itself with no depth limit. It is possible to construct a name which saturates the call stack (at least with larger TCP responses), leading to a potential Denial of Service. The guard `$link < $offset` prevents forward and circular chains, but still allows arbitrarily long backward chains. The per-offset cache (`$cache`) is populated at the start of each call and short-circuits only re-traverses of the same offset - the initial descent through a fresh chain still recurses at full depth. A crafted packet can chain two-byte compression pointers so that each one points two bytes earlier than the previous, producing a chain length of `offset / 2`. For the 14-bit pointer field (max offset 16383) this gives up to ~8191 recursive frames. For a TCP DNS message the limit is the 16-bit length field (~32767 frames). Perl's default C stack handles only a few thousand frames; beyond that the process receives SIGSEGV or similar, which is a denial-of-service for any application parsing untrusted DNS data. The vulnerability is triggered by `Net::DNS::Packet->new(\$wire)` i.e. any point where the library decodes a DNS message from the network.

NAME

Net::DNS::RR::TKEY - DNS TKEY resource record

SYNOPSIS

use Net::DNS::RR;

DESCRIPTION

Class for DNS TKEY resource records.

METHODS

algorithm

$rr->algorithm($algorithm_name);
print "algorithm = ", $rr->algorithm, "\n";

Gets or sets the domain name that specifies the name of the algorithm. The default algorithm is gss.microsoft.com

inception

$rr->inception(time);
print "inception = ", $rr->inception, "\n";

Gets or sets the inception time as the number of seconds since 1 Jan 1970 00:00:00 UTC.

The default inception time is the current time.

expiration

$rr->expiration(time);
print "expiration = ", $rr->expiration, "\n";

Gets or sets the expiration time as the number of seconds since 1 Jan 1970 00:00:00 UTC.

The default expiration time is the current time plus 1 day.

mode

$rr->mode(3);
print "mode = ", $rr->mode, "\n";

Sets the key mode (see rfc2930). The default is 3 which corresponds to GSSAPI

error

print "error = ", $rr->error, "\n";

Returns the RCODE covering TKEY processing. See RFC 2930 for details.

other_len

print "other len = ", $rr->other_len, "\n";

Returns the length of the Other Data. Should be zero.

other_data

print "other data = ", $rr->other_data, "\n";

Returns the Other Data. This field should be empty.

BUGS

This code has not been extensively tested. Use with caution on production systems. See http://samba.org/ftp/samba/tsig-gss/ for an example usage.

COPYRIGHT

Copyright (c) 2000 Andrew Tridgell. All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

ACKNOWLEDGMENT

The Net::DNS::RR::TKEY module is based on the TSIG module by Michael Fuhr and Chris Turbeville.

SEE ALSO

perl(1), Net::DNS, Net::DNS::Resolver, Net::DNS::Packet, Net::DNS::Header, Net::DNS::Question, Net::DNS::RR, RFC 2845