|
|
@ -1,120 +0,0 @@ |
|
|
|
From e03553605b45c88f0b4b2980adfbbb8f6fca2fd6 Mon Sep 17 00:00:00 2001 |
|
|
|
From: Nick Wellnhofer <wellnhofer@aevum.de> |
|
|
|
Date: Sun, 24 Mar 2019 09:51:39 +0100 |
|
|
|
Subject: [PATCH] Fix security framework bypass |
|
|
|
|
|
|
|
xsltCheckRead and xsltCheckWrite return -1 in case of error but callers |
|
|
|
don't check for this condition and allow access. With a specially |
|
|
|
crafted URL, xsltCheckRead could be tricked into returning an error |
|
|
|
because of a supposedly invalid URL that would still be loaded |
|
|
|
succesfully later on. |
|
|
|
|
|
|
|
Fixes #12. |
|
|
|
|
|
|
|
Thanks to Felix Wilhelm for the report. |
|
|
|
---
|
|
|
|
libxslt/documents.c | 18 ++++++++++-------- |
|
|
|
libxslt/imports.c | 9 +++++---- |
|
|
|
libxslt/transform.c | 9 +++++---- |
|
|
|
libxslt/xslt.c | 9 +++++---- |
|
|
|
4 files changed, 25 insertions(+), 20 deletions(-) |
|
|
|
|
|
|
|
diff --git a/libxslt/documents.c b/libxslt/documents.c
|
|
|
|
index 3f3a7312..4aad11bb 100644
|
|
|
|
--- a/libxslt/documents.c
|
|
|
|
+++ b/libxslt/documents.c
|
|
|
|
@@ -296,10 +296,11 @@ xsltLoadDocument(xsltTransformContextPtr ctxt, const xmlChar *URI) {
|
|
|
|
int res; |
|
|
|
|
|
|
|
res = xsltCheckRead(ctxt->sec, ctxt, URI); |
|
|
|
- if (res == 0) {
|
|
|
|
- xsltTransformError(ctxt, NULL, NULL,
|
|
|
|
- "xsltLoadDocument: read rights for %s denied\n",
|
|
|
|
- URI);
|
|
|
|
+ if (res <= 0) {
|
|
|
|
+ if (res == 0)
|
|
|
|
+ xsltTransformError(ctxt, NULL, NULL,
|
|
|
|
+ "xsltLoadDocument: read rights for %s denied\n",
|
|
|
|
+ URI);
|
|
|
|
return(NULL); |
|
|
|
} |
|
|
|
} |
|
|
|
@@ -372,10 +373,11 @@ xsltLoadStyleDocument(xsltStylesheetPtr style, const xmlChar *URI) {
|
|
|
|
int res; |
|
|
|
|
|
|
|
res = xsltCheckRead(sec, NULL, URI); |
|
|
|
- if (res == 0) {
|
|
|
|
- xsltTransformError(NULL, NULL, NULL,
|
|
|
|
- "xsltLoadStyleDocument: read rights for %s denied\n",
|
|
|
|
- URI);
|
|
|
|
+ if (res <= 0) {
|
|
|
|
+ if (res == 0)
|
|
|
|
+ xsltTransformError(NULL, NULL, NULL,
|
|
|
|
+ "xsltLoadStyleDocument: read rights for %s denied\n",
|
|
|
|
+ URI);
|
|
|
|
return(NULL); |
|
|
|
} |
|
|
|
} |
|
|
|
diff --git a/libxslt/imports.c b/libxslt/imports.c
|
|
|
|
index 874870cc..3783b247 100644
|
|
|
|
--- a/libxslt/imports.c
|
|
|
|
+++ b/libxslt/imports.c
|
|
|
|
@@ -130,10 +130,11 @@ xsltParseStylesheetImport(xsltStylesheetPtr style, xmlNodePtr cur) {
|
|
|
|
int secres; |
|
|
|
|
|
|
|
secres = xsltCheckRead(sec, NULL, URI); |
|
|
|
- if (secres == 0) {
|
|
|
|
- xsltTransformError(NULL, NULL, NULL,
|
|
|
|
- "xsl:import: read rights for %s denied\n",
|
|
|
|
- URI);
|
|
|
|
+ if (secres <= 0) {
|
|
|
|
+ if (secres == 0)
|
|
|
|
+ xsltTransformError(NULL, NULL, NULL,
|
|
|
|
+ "xsl:import: read rights for %s denied\n",
|
|
|
|
+ URI);
|
|
|
|
goto error; |
|
|
|
} |
|
|
|
} |
|
|
|
diff --git a/libxslt/transform.c b/libxslt/transform.c
|
|
|
|
index 13793914..0636dbd0 100644
|
|
|
|
--- a/libxslt/transform.c
|
|
|
|
+++ b/libxslt/transform.c
|
|
|
|
@@ -3493,10 +3493,11 @@ xsltDocumentElem(xsltTransformContextPtr ctxt, xmlNodePtr node,
|
|
|
|
*/ |
|
|
|
if (ctxt->sec != NULL) { |
|
|
|
ret = xsltCheckWrite(ctxt->sec, ctxt, filename); |
|
|
|
- if (ret == 0) {
|
|
|
|
- xsltTransformError(ctxt, NULL, inst,
|
|
|
|
- "xsltDocumentElem: write rights for %s denied\n",
|
|
|
|
- filename);
|
|
|
|
+ if (ret <= 0) {
|
|
|
|
+ if (ret == 0)
|
|
|
|
+ xsltTransformError(ctxt, NULL, inst,
|
|
|
|
+ "xsltDocumentElem: write rights for %s denied\n",
|
|
|
|
+ filename);
|
|
|
|
xmlFree(URL); |
|
|
|
xmlFree(filename); |
|
|
|
return; |
|
|
|
diff --git a/libxslt/xslt.c b/libxslt/xslt.c
|
|
|
|
index 780a5ad7..a234eb79 100644
|
|
|
|
--- a/libxslt/xslt.c
|
|
|
|
+++ b/libxslt/xslt.c
|
|
|
|
@@ -6763,10 +6763,11 @@ xsltParseStylesheetFile(const xmlChar* filename) {
|
|
|
|
int res; |
|
|
|
|
|
|
|
res = xsltCheckRead(sec, NULL, filename); |
|
|
|
- if (res == 0) {
|
|
|
|
- xsltTransformError(NULL, NULL, NULL,
|
|
|
|
- "xsltParseStylesheetFile: read rights for %s denied\n",
|
|
|
|
- filename);
|
|
|
|
+ if (res <= 0) {
|
|
|
|
+ if (res == 0)
|
|
|
|
+ xsltTransformError(NULL, NULL, NULL,
|
|
|
|
+ "xsltParseStylesheetFile: read rights for %s denied\n",
|
|
|
|
+ filename);
|
|
|
|
return(NULL); |
|
|
|
} |
|
|
|
} |
|
|
|
--
|
|
|
|
2.18.1 |
|
|
|
|