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changes based on review

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This commit is contained in:
Erik Krogh Kristensen
2020-02-17 14:44:10 +01:00
parent a6d644bac0
commit 2885d48ad0
4 changed files with 60 additions and 19 deletions
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2
javascript/ql/src/semmle/javascript/security/dataflow/TaintedPath.qll
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@@ -36,7 +36,7 @@ module TaintedPath {
guard instanceof StartsWithDirSanitizer or
guard instanceof IsAbsoluteSanitizer or
guard instanceof ContainsDotDotSanitizer or
guard instanceof RelativePathContainsDotDotGuard
guard instanceof RelativePathStartsWithDotDotSanitizer
}
override predicate isAdditionalFlowStep(

31
javascript/ql/src/semmle/javascript/security/dataflow/TaintedPathCustomizations.qll
View File

@@ -353,20 +353,22 @@ module TaintedPath {
/**
* A sanitizer that recognizes the following pattern:
* var relative = path.relative(webroot, pathname);
* if(relative.startsWith(".." + path.sep) || relative == "..") {
* // pathname is unsafe
* } else {
* // pathname is safe
* }
* ```
* var relative = path.relative(webroot, pathname);
* if(relative.startsWith(".." + path.sep) || relative == "..") {
* // pathname is unsafe
* } else {
* // pathname is safe
* }
* ```
*/
class RelativePathContainsDotDotGuard extends DataFlow::BarrierGuardNode {
class RelativePathStartsWithDotDotSanitizer extends DataFlow::BarrierGuardNode {
StringOps::StartsWith startsWith;
DataFlow::CallNode relativeCall;
RelativePathContainsDotDotGuard() {
RelativePathStartsWithDotDotSanitizer() {
this = startsWith and
relativeCall = DataFlow::moduleImport("path").getAMemberCall("relative") and
relativeCall = NodeJSLib::Path::moduleMember("relative").getACall() and
(
startsWith.getBaseString().getALocalSource() = relativeCall
or
@@ -377,18 +379,11 @@ module TaintedPath {
.getInput()
.getALocalSource() = relativeCall
) and
exists(DataFlow::Node subString, string prefix |
subString = startsWith.getSubstring() and
(prefix = ".." or prefix = "../")
|
subString.mayHaveStringValue(prefix)
or
subString.(StringOps::ConcatenationRoot).getFirstLeaf().mayHaveStringValue(prefix)
)
isDotDotSlashPrefix(startsWith.getSubstring())
}
override predicate blocks(boolean outcome, Expr e) {
e = relativeCall.getArgument(1).asExpr() and outcome = false
e = relativeCall.getArgument(1).asExpr() and outcome = startsWith.getPolarity().booleanNot()
}
}