Unable to download Microsoft CSAF

[Rafiot]

I'm not sure what the issue is, but fetching the CSAF entries from Microsoft fails in a weird way: downloader.log

{"time":"2024-11-19T15:19:47+01:00","level":"INFO","msg":"AdvisoryFileProcessor.Process: \"https://msrc.microsoft.com/csaf/changes.csv\" has an invalid time stamp in line 89: parsing time \"2024-11-12T08:00:00.0000000\" as \"2006-01-02T15:04:05Z07:00\": cannot parse \"\" as \"Z07:00\""}

The call:

csaf_downloader -d csaf_microsoft https://msrc.microsoft.com/csaf/provider-metadata.json

Do you have any idea how to fix it?

[bernhardreiter]

A line from https://msrc.microsoft.com/csaf/changes.csv:

2024/msrc_cve-2024-49060.json,2024-11-15T08:00:00.0000000

Checking the format, this seems to be missing a timezone, so it is an invalid file.

https://docs.oasis-open.org/csaf/csaf/v2.0/os/csaf-v2.0-os.html#7113-requirement-13-changescsv has

lines MUST be sorted by the current_release_date timestamp

https://docs.oasis-open.org/csaf/csaf/v2.0/os/csaf-v2.0-os.html#321122-document-property---tracking---current-release-date

(current_release_date) with value type string with format date-time

And date-time is defined in https://json-schema.org/understanding-json-schema/reference/string as

Dates and times are represented in RFC 3339, section 5.6.

"date-time": Date and time together, for example, 2018-11-13T20:20:39+00:00

https://datatracker.ietf.org/doc/html/rfc3339#section-5.6 then has an ABNF which has

time-offset = "Z" / time-numoffset
full-time = partial-time time-offset

The time-offset is missing in the file. Best would be if the provider could fix this on their end.

[Rafiot]

I'm reporting it to Microsoft, and pointing them to your details, thanks!

[Rafiot]

Update on that: the time issue is fixed, but now I get this error:

{"time":"2024-11-21T22:39:59+01:00","level":"WARN","msg":"Content type is not 'application/json'","url":"https://msrc.microsoft.com/csaf/2024/msrc_cve-2024-49028.json","content_type":"application/json; charset=utf-8"}

Their server returns application/json; charset=utf-8 when you expect application/json, but both should be valid (?).

I couldn't find it in the specs, but I'll drop them another mail if needed.

[tschmidtb51]

Their server returns application/json; charset=utf-8 when you expect application/json, but both should be valid (?).

True. IMHO, both should be valid.
Flagging @bernhardreiter to suggest on how we want to deal with the situation in the checker in general.