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πŸ›‘οΈ Sentinel: [CRITICAL] Fix weak regex in readline to prevent DoS #149

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πŸ›‘οΈ Sentinel: [CRITICAL] Fix weak regex in readline to prevent DoS #149

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5 changes: 5 additions & 0 deletions .jules/sentinel.md
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Original file line number Diff line number Diff line change
Expand Up @@ -2,3 +2,8 @@
**Vulnerability:** Unvalidated inputs passed to `if()` statements can cause process crashes (`condition has length > 1`) or unexpected coercion vulnerabilities.
**Learning:** In R, optional boolean parameters that default to `NULL` should be validated using explicit runtime type validation (e.g., `if (!is.null(flag) && (!is.logical(flag) || length(flag) != 1 || is.na(flag)))`).
**Prevention:** Always implement explicit runtime type validation for optional boolean parameters.

## 2024-07-18 - [Weak regex check in `readline()` inputs causes Denial of Service]
**Vulnerability:** The code used weak regex like `^[0-9]+$` for boolean-like choices via `readline()`, which allowed users to enter huge strings or numbers that evaluate out-of-bounds in R, resulting in an unhandled exception or integer coercion failure.
**Learning:** `readline()` inputs in automated/interactive scripts require strict length/value matching rather than open-ended string matching. `^[0-9]+$` on a prompt that only accepts '1' or '2' is too permissive.
**Prevention:** Use strictly bounded matching like `^[12]$` when only specific inputs are acceptable.
6 changes: 3 additions & 3 deletions R/aFIPC.R
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Expand Up @@ -141,7 +141,7 @@ autoFIPC <-
}
for (attempt in seq_len(3)) {
n <- readline(prompt = "Is it correct? (1: Yes 2: No) : ")
if (grepl("^[0-9]+$", n)) {
if (grepl("^[12]$", n)) {
return(as.integer(n))
}
}
Expand Down Expand Up @@ -171,7 +171,7 @@ autoFIPC <-
readline(
prompt = "Do you want to use default BILOG-MG priors for oldform Data? (1: Yes 2: No) : "
)
if (grepl("^[0-9]+$", n)) {
if (grepl("^[12]$", n)) {
return(as.integer(n))
}
}
Expand Down Expand Up @@ -390,7 +390,7 @@ autoFIPC <-
readline(
prompt = "Do you want to use default BILOG-MG priors for newform Data? (1: Yes 2: No) : "
)
if (grepl("^[0-9]+$", n)) {
if (grepl("^[12]$", n)) {
return(as.integer(n))
}
}
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