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Merge pull request #20048 from Napalys/js/xml_bomb_sinks

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JS: Exclude patched libraries from `xml-bomb` sink
This commit is contained in:
Napalys Klicius
2025-08-29 08:10:55 +02:00
committed by GitHub
parent 0cc9ff8320 ea93b392f7
commit bafe22c50c
11 changed files with 23 additions and 39 deletions
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4
javascript/ql/lib/change-notes/2025-07-15-xml-bomb-sinks.md Normal file
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@@ -0,0 +1,4 @@
---
category: minorAnalysis
---
* Removed `libxmljs` as an XML bomb sink. The underlying libxml2 library now includes [entity reference loop detection](https://github.com/GNOME/libxml2/blob/0c948334a8f5c66d50e9f8992e62998017dc4fc6/NEWS#L905-L908) that prevents XML bomb attacks.

14
javascript/ql/lib/semmle/javascript/frameworks/XmlParsers.qll
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@@ -49,9 +49,7 @@ module XML {
override JS::Expr getSourceArgument() { result = this.getArgument(0) }
override predicate resolvesEntities(EntityKind kind) {
// internal entities are always resolved
kind = InternalEntity()
or
not kind = InternalEntity() and
// other entities are only resolved if the configuration option `noent` is set to `true`
exists(JS::Expr noent |
this.hasOptionArgument(1, "noent", noent) and
@@ -126,8 +124,9 @@ module XML {
override JS::Expr getSourceArgument() { result = this.getArgument(0) }
override predicate resolvesEntities(EntityKind kind) {
// entities are resolved by default
any()
// SAX parsers in libxmljs also inherit libxml2's protection against XML bombs
kind = ExternalEntity(_) or
kind = ParameterEntity(true)
}
override DataFlow::Node getAResult() {
@@ -149,8 +148,9 @@ module XML {
override JS::Expr getSourceArgument() { result = this.getArgument(0) }
override predicate resolvesEntities(EntityKind kind) {
// entities are resolved by default
any()
// SAX push parsers in libxmljs also inherit libxml2's protection against XML bombs
kind = ExternalEntity(_) or
kind = ParameterEntity(true)
}
override DataFlow::Node getAResult() {

8
javascript/ql/test/query-tests/Security/CWE-776/XmlBomb.expected
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@@ -5,10 +5,6 @@
| domparser.js:11:57:11:59 | src | domparser.js:2:13:2:36 | documen ... .search | domparser.js:11:57:11:59 | src | XML parsing depends on a $@ without guarding against uncontrolled entity expansion. | domparser.js:2:13:2:36 | documen ... .search | user-provided value |
| expat.js:6:16:6:36 | req.par ... e-xml") | expat.js:6:16:6:36 | req.par ... e-xml") | expat.js:6:16:6:36 | req.par ... e-xml") | XML parsing depends on a $@ without guarding against uncontrolled entity expansion. | expat.js:6:16:6:36 | req.par ... e-xml") | user-provided value |
| jquery.js:4:14:4:16 | src | jquery.js:2:13:2:36 | documen ... .search | jquery.js:4:14:4:16 | src | XML parsing depends on a $@ without guarding against uncontrolled entity expansion. | jquery.js:2:13:2:36 | documen ... .search | user-provided value |
| libxml.js:5:21:5:41 | req.par ... e-xml") | libxml.js:5:21:5:41 | req.par ... e-xml") | libxml.js:5:21:5:41 | req.par ... e-xml") | XML parsing depends on a $@ without guarding against uncontrolled entity expansion. | libxml.js:5:21:5:41 | req.par ... e-xml") | user-provided value |
| libxml.noent.js:5:21:5:41 | req.par ... e-xml") | libxml.noent.js:5:21:5:41 | req.par ... e-xml") | libxml.noent.js:5:21:5:41 | req.par ... e-xml") | XML parsing depends on a $@ without guarding against uncontrolled entity expansion. | libxml.noent.js:5:21:5:41 | req.par ... e-xml") | user-provided value |
| libxml.sax.js:6:22:6:42 | req.par ... e-xml") | libxml.sax.js:6:22:6:42 | req.par ... e-xml") | libxml.sax.js:6:22:6:42 | req.par ... e-xml") | XML parsing depends on a $@ without guarding against uncontrolled entity expansion. | libxml.sax.js:6:22:6:42 | req.par ... e-xml") | user-provided value |
| libxml.saxpush.js:6:15:6:35 | req.par ... e-xml") | libxml.saxpush.js:6:15:6:35 | req.par ... e-xml") | libxml.saxpush.js:6:15:6:35 | req.par ... e-xml") | XML parsing depends on a $@ without guarding against uncontrolled entity expansion. | libxml.saxpush.js:6:15:6:35 | req.par ... e-xml") | user-provided value |
edges
| closure.js:2:7:2:36 | src | closure.js:3:24:3:26 | src | provenance | |
| closure.js:2:13:2:36 | documen ... .search | closure.js:2:7:2:36 | src | provenance | |
@@ -31,8 +27,4 @@ nodes
| jquery.js:2:7:2:36 | src | semmle.label | src |
| jquery.js:2:13:2:36 | documen ... .search | semmle.label | documen ... .search |
| jquery.js:4:14:4:16 | src | semmle.label | src |
| libxml.js:5:21:5:41 | req.par ... e-xml") | semmle.label | req.par ... e-xml") |
| libxml.noent.js:5:21:5:41 | req.par ... e-xml") | semmle.label | req.par ... e-xml") |
| libxml.sax.js:6:22:6:42 | req.par ... e-xml") | semmle.label | req.par ... e-xml") |
| libxml.saxpush.js:6:15:6:35 | req.par ... e-xml") | semmle.label | req.par ... e-xml") |
subpaths

2
javascript/ql/test/query-tests/Security/CWE-776/libxml.js
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@@ -2,5 +2,5 @@ const express = require('express');
const libxmljs = require('libxmljs');
express().get('/some/path', function(req) {
libxmljs.parseXml(req.param("some-xml")); // $ Alert - libxml expands internal general entities by default
libxmljs.parseXml(req.param("some-xml"));
});

2
javascript/ql/test/query-tests/Security/CWE-776/libxml.noent.js
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@@ -2,5 +2,5 @@ const express = require('express');
const libxmljs = require('libxmljs');
express().get('/some/path', function(req) {
libxmljs.parseXml(req.param("some-xml"), { noent: true }); // $ Alert - unguarded entity expansion
libxmljs.parseXml(req.param("some-xml"), { noent: true });
});

2
javascript/ql/test/query-tests/Security/CWE-776/libxml.sax.js
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@@ -3,5 +3,5 @@ const libxmljs = require('libxmljs');
express().get('/some/path', function(req) {
const parser = new libxmljs.SaxParser();
parser.parseString(req.param("some-xml")); // $ Alert - the SAX parser expands external entities by default
parser.parseString(req.param("some-xml"));
});

2
javascript/ql/test/query-tests/Security/CWE-776/libxml.saxpush.js
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@@ -3,5 +3,5 @@ const libxmljs = require('libxmljs');
express().get('/some/path', function(req) {
const parser = new libxmljs.SaxPushParser();
parser.push(req.param("some-xml")); // $ Alert - the SAX parser expands external entities by default
parser.push(req.param("some-xml"));
});