Fix garbled screen when HTTP Age is not a non-negative int (branch 3.2)#2887
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Fix garbled screen when HTTP Age is not a non-negative int (branch 3.2)#2887
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As suggested in #2885 parsing of the server determined HTTP age var wasn't strict enough, this is a backport for 3.2. https://www.rfc-editor.org/rfc/rfc7234#section-1.2.1 requires the variable to be a non-negative integer but testssl.sh assumed it was like that but did't check whether that really was the case. This was labled as a (potential) security problem. Potential as it didn't look exploitable after review -- the header as a whole was already sanitized. This PR fixes the typs confusion and the garbled screen by checking the variable early in run_http_header() and reset it to NaN. That will be used later in run_http_date() to raise a low severity finding. Kudos to @Tristanhx for catching this and for the suggested PR. Also, only when running in debug mode, this PR fixes that during service_detection() parts of the not-yet-sanitized header ended up on the screen. The fix just calls sanitze_http_header() for the temporary variable $TMPFILE. For 3.2 sanitze_http_header() had to be modified to accept an argument and the callers needed to be changed.
... which was catched in unit tests t/{baseline_ipv4_http.t,23_client_simulation}
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Hey thanks for fixing this and the mention! I'm glad to have helped make testssl.sh even better. |
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As suggested in #2885 parsing of the server determined HTTP age var wasn't strict enough, this is a backport for 3.2.
https://www.rfc-editor.org/rfc/rfc7234#section-1.2.1 requires the variable to be a non-negative integer but testssl.sh assumed it was like that but did't check whether that really was the case. This was labled as a (potential) security problem. Potential as it didn't look exploitable after review -- the header as a whole was already sanitized.
This PR fixes the typs confusion and the garbled screen by checking the variable early in run_http_header() and reset it to NaN. That will be used later in run_http_date() to raise a low severity finding. Kudos to @Tristanhx for catching this and for the suggested PR.
Also, only when running in debug mode, this PR fixes that during service_detection() parts of the not-yet-sanitized header ended up on the screen. The fix just calls sanitze_http_header() for the temporary variable $TMPFILE.
For 3.2 sanitize_http_header() had to be modified to accept an argument and the callers needed to be changed.
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