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VAULT-32330: fix sanitize path function to account for backslashes #28878

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merged 8 commits into from
Nov 13, 2024
Merged

VAULT-32330: fix sanitize path function to account for backslashes #28878

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ff68b56
expand the leading prefix check to check for double forward and back …
aslamovamir Nov 11, 2024
2a78b54
improve the logic to be more concise
aslamovamir Nov 12, 2024
917f890
add unit tests
aslamovamir Nov 12, 2024
5db03a3
Merge branch 'main' into aslamovamir-vault-32330
aslamovamir Nov 12, 2024
0aa5c4f
add a changelog
aslamovamir Nov 12, 2024
05f38a0
make it a bug type
aslamovamir Nov 12, 2024
5dc2205
feedback: reconstruct the check to explicitly check for backslash as …
aslamovamir Nov 12, 2024
9805350
Merge branch 'main' into aslamovamir-vault-32330
aslamovamir Nov 13, 2024
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improve the logic to be more concise
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@aslamovamir
aslamovamir committed Nov 12, 2024
commit 2a78b5433956364da9548ad90323eb90048cdc3c
12 changes: 2 additions & 10 deletions vault/logical_system.go
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Original file line number Diff line number Diff line change
Expand Up @@ -6168,16 +6168,8 @@ func sanitizePath(path string) string {
path += "/"
}

// Remove any leading slashes, double slashes, or slash-backslash combinations
for len(path) > 0 && (strings.HasPrefix(path, "/") || strings.HasPrefix(path, "//") || strings.HasPrefix(path, "/\\")) {
if strings.HasPrefix(path, "//") {
path = path[2:]
} else if strings.HasPrefix(path, "/\\") {
path = path[2:]
} else {
path = path[1:]
}
}
// Remove all leading forward slashes and backslashes
path = strings.TrimLeft(path, "/\\")
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This might not be the correct based on my reading of the finding, i.e.
has a leading slash, but not that it does not have '/' or '\' in its second position.

For example, I think this would modify \string to string, but that it shouldn't. Based on my reading, I think this should only trim /, //, or /\.

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I might be misunderstanding - the way I understood this was that we not only have to check for a leading "/" but also a "//" and "/". Is this what you're saying as well Violet?

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My reading is that it needs to check for /, //, and /\ -- it shouldn't modify a path that starts with \

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@aslamovamir aslamovamir Nov 12, 2024 •
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This is the exact error from the security check: A redirect check that checks for a leading slash but not two leading slashes or a leading slash followed by a backslash is incomplete.

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@divyaac divyaac Nov 12, 2024 •
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Violet's comment is the way I understand it too. But since it's trimming the leading slash after it checks it, it looks there is some modification that needs to be done?

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Right, so we don't want to modify strings that start with a backslash -- which TrimLeft will do

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For clarity here, the behavior we want is:

//my_string ==> my_string
/my_string ==> my_string
/\my_string ==> my_string
/my_string ==> /my_string
\\//my_string ==> \\//my_string

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Pushed a commit to address the concerns, please do let me know if it looks better now, many thanks!


return path
}
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