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From e03553605b45c88f0b4b2980adfbbb8f6fca2fd6 Mon Sep 17 00:00:00 2001
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From: Nick Wellnhofer <wellnhofer@aevum.de>
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Date: Sun, 24 Mar 2019 09:51:39 +0100
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Subject: [PATCH] Fix security framework bypass
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xsltCheckRead and xsltCheckWrite return -1 in case of error but callers
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don't check for this condition and allow access. With a specially
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crafted URL, xsltCheckRead could be tricked into returning an error
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because of a supposedly invalid URL that would still be loaded
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succesfully later on.
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Fixes #12.
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Thanks to Felix Wilhelm for the report.
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---
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libxslt/documents.c | 18 ++++++++++--------
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libxslt/imports.c | 9 +++++----
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libxslt/transform.c | 9 +++++----
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libxslt/xslt.c | 9 +++++----
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4 files changed, 25 insertions(+), 20 deletions(-)
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diff --git a/libxslt/documents.c b/libxslt/documents.c
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index 3f3a7312..4aad11bb 100644
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--- a/libxslt/documents.c
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+++ b/libxslt/documents.c
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@@ -296,10 +296,11 @@ xsltLoadDocument(xsltTransformContextPtr ctxt, const xmlChar *URI) {
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int res;
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res = xsltCheckRead(ctxt->sec, ctxt, URI);
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- if (res == 0) {
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- xsltTransformError(ctxt, NULL, NULL,
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- "xsltLoadDocument: read rights for %s denied\n",
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- URI);
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+ if (res <= 0) {
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+ if (res == 0)
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+ xsltTransformError(ctxt, NULL, NULL,
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+ "xsltLoadDocument: read rights for %s denied\n",
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+ URI);
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return(NULL);
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}
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}
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@@ -372,10 +373,11 @@ xsltLoadStyleDocument(xsltStylesheetPtr style, const xmlChar *URI) {
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int res;
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res = xsltCheckRead(sec, NULL, URI);
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- if (res == 0) {
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- xsltTransformError(NULL, NULL, NULL,
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- "xsltLoadStyleDocument: read rights for %s denied\n",
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- URI);
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+ if (res <= 0) {
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+ if (res == 0)
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+ xsltTransformError(NULL, NULL, NULL,
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+ "xsltLoadStyleDocument: read rights for %s denied\n",
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+ URI);
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return(NULL);
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}
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}
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diff --git a/libxslt/imports.c b/libxslt/imports.c
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index 874870cc..3783b247 100644
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--- a/libxslt/imports.c
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+++ b/libxslt/imports.c
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@@ -130,10 +130,11 @@ xsltParseStylesheetImport(xsltStylesheetPtr style, xmlNodePtr cur) {
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int secres;
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secres = xsltCheckRead(sec, NULL, URI);
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- if (secres == 0) {
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- xsltTransformError(NULL, NULL, NULL,
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- "xsl:import: read rights for %s denied\n",
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- URI);
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+ if (secres <= 0) {
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+ if (secres == 0)
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+ xsltTransformError(NULL, NULL, NULL,
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+ "xsl:import: read rights for %s denied\n",
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+ URI);
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goto error;
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}
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}
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diff --git a/libxslt/transform.c b/libxslt/transform.c
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index 13793914..0636dbd0 100644
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--- a/libxslt/transform.c
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+++ b/libxslt/transform.c
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@@ -3493,10 +3493,11 @@ xsltDocumentElem(xsltTransformContextPtr ctxt, xmlNodePtr node,
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*/
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if (ctxt->sec != NULL) {
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ret = xsltCheckWrite(ctxt->sec, ctxt, filename);
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- if (ret == 0) {
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- xsltTransformError(ctxt, NULL, inst,
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- "xsltDocumentElem: write rights for %s denied\n",
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- filename);
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+ if (ret <= 0) {
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+ if (ret == 0)
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+ xsltTransformError(ctxt, NULL, inst,
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+ "xsltDocumentElem: write rights for %s denied\n",
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+ filename);
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xmlFree(URL);
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xmlFree(filename);
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return;
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diff --git a/libxslt/xslt.c b/libxslt/xslt.c
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index 780a5ad7..a234eb79 100644
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--- a/libxslt/xslt.c
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+++ b/libxslt/xslt.c
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@@ -6763,10 +6763,11 @@ xsltParseStylesheetFile(const xmlChar* filename) {
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int res;
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res = xsltCheckRead(sec, NULL, filename);
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- if (res == 0) {
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- xsltTransformError(NULL, NULL, NULL,
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- "xsltParseStylesheetFile: read rights for %s denied\n",
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- filename);
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+ if (res <= 0) {
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+ if (res == 0)
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+ xsltTransformError(NULL, NULL, NULL,
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+ "xsltParseStylesheetFile: read rights for %s denied\n",
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+ filename);
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return(NULL);
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}
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}
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--
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2.24.1
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