Hi Marcin,
On 04.10.24 13:52, Marcin Owsiany wrote:
Indeed, on host B the following appears at the same time the print
dialog hangs in evince ("piec" is host A):
E [04/Oct/2024:13:29:44 +0200] HP_Smart_Tank_710_720_series_piec:
Printer returned invalid data: \"media-supported\": Bad keyword value
\"\" - invalid character (RFC 8011 section 5.1.4).
yes, this message belongs to the new validation of attributes that was
part of the latest patches.
Unfortunately this printer does not behave correct, so I think this is
rather a feature than a bug.
FWIW, I did "sudo grep -R media-supported /etc 2>/dev/null" and that
came back with nothing. So I guess it's a bug in the printer's
firmware? Can I work this around somehow on the cups side?
yes, this is a bug in the printer's firmware. cups asks the printer
about some properties and one of the answers contains a non RFC-conform
character. Other such characters resulted in an RCE, so this check is
somewhat important. If there is no other firmware available, I am afraid
you have to build your own cups package.
The culprit is in 0024-CVE-2024-47175-and-further-hardening.patch for
scheduler/ipp.c
Thorsten
