Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| NLNETLABS / Net::DNS | affected 0 through 1.55 |
CWE
CWE-95
References
- https://www.net-dns.org/blog/#release-candidate-for-netdns-1.56
- https://rt.cpan.org/Ticket/Display.html?id=179945
- https://metacpan.org/release/NLNETLABS/Net-DNS-1.55_01/changes
ADP enrichment
No English description supplied.
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No references supplied.