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fix for CVE-2008-3281 Daniel

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* include/libxml/parser.h include/libxml/entities.h entities.c
  parserInternals.c parser.c: fix for CVE-2008-3281
Daniel

svn path=/trunk/; revision=3772
This commit is contained in:
Daniel Veillard 2008-08-20 17:04:30 +00:00
parent 117baa074d
commit 4bf899bf1b
6 changed files with 46 additions and 9 deletions
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5
ChangeLog
View File

@ -1,3 +1,8 @@
Wed Aug 20 19:02:01 CEST 2008 Daniel Veillard <daniel@veillard.com>
* include/libxml/parser.h include/libxml/entities.h entities.c
parserInternals.c parser.c: fix for CVE-2008-3281
Sun Aug 10 17:06:13 CEST 2008 Rob Richards <rrichards@ctindustries.net>
* dict.c: fix non GNUC builds.

10
entities.c
View File

@ -31,35 +31,35 @@ static xmlEntity xmlEntityLt = {
NULL, NULL, NULL, NULL, NULL, NULL,
BAD_CAST "<", BAD_CAST "<", 1,
XML_INTERNAL_PREDEFINED_ENTITY,
NULL, NULL, NULL, NULL, 0, 1
NULL, NULL, NULL, NULL, 0, 1, 0
};
static xmlEntity xmlEntityGt = {
NULL, XML_ENTITY_DECL, BAD_CAST "gt",
NULL, NULL, NULL, NULL, NULL, NULL,
BAD_CAST ">", BAD_CAST ">", 1,
XML_INTERNAL_PREDEFINED_ENTITY,
NULL, NULL, NULL, NULL, 0, 1
NULL, NULL, NULL, NULL, 0, 1, 0
};
static xmlEntity xmlEntityAmp = {
NULL, XML_ENTITY_DECL, BAD_CAST "amp",
NULL, NULL, NULL, NULL, NULL, NULL,
BAD_CAST "&", BAD_CAST "&", 1,
XML_INTERNAL_PREDEFINED_ENTITY,
NULL, NULL, NULL, NULL, 0, 1
NULL, NULL, NULL, NULL, 0, 1, 0
};
static xmlEntity xmlEntityQuot = {
NULL, XML_ENTITY_DECL, BAD_CAST "quot",
NULL, NULL, NULL, NULL, NULL, NULL,
BAD_CAST "\"", BAD_CAST "\"", 1,
XML_INTERNAL_PREDEFINED_ENTITY,
NULL, NULL, NULL, NULL, 0, 1
NULL, NULL, NULL, NULL, 0, 1, 0
};
static xmlEntity xmlEntityApos = {
NULL, XML_ENTITY_DECL, BAD_CAST "apos",
NULL, NULL, NULL, NULL, NULL, NULL,
BAD_CAST "'", BAD_CAST "'", 1,
XML_INTERNAL_PREDEFINED_ENTITY,
NULL, NULL, NULL, NULL, 0, 1
NULL, NULL, NULL, NULL, 0, 1, 0
};
/**

1
include/libxml/entities.h
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@ -57,6 +57,7 @@ struct _xmlEntity {
const xmlChar *URI; /* the full URI as computed */
int owner; /* does the entity own the childrens */
int checked; /* was the entity content checked */
unsigned long nbentities; /* the number of entities references */
};
/*

1
include/libxml/parser.h
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@ -297,6 +297,7 @@ struct _xmlParserCtxt {
*/
xmlError lastError;
xmlParserMode parseMode; /* the parser mode */
unsigned long nbentities; /* number of entities references */
};
/**

37
parser.c
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@ -2379,7 +2379,7 @@ xmlStringLenDecodeEntities(xmlParserCtxtPtr ctxt, const xmlChar *str, int len,
return(NULL);
last = str + len;
if (ctxt->depth > 40) {
if ((ctxt->depth > 40) || (ctxt->nbentities >= 500000)) {
xmlFatalErr(ctxt, XML_ERR_ENTITY_LOOP, NULL);
return(NULL);
}
@ -2417,6 +2417,11 @@ xmlStringLenDecodeEntities(xmlParserCtxtPtr ctxt, const xmlChar *str, int len,
"String decoding Entity Reference: %.30s\n",
str);
ent = xmlParseStringEntityRef(ctxt, &str);
if (ctxt->lastError.code == XML_ERR_ENTITY_LOOP)
goto int_error;
ctxt->nbentities++;
if (ent != NULL)
ctxt->nbentities += ent->nbentities;
if ((ent != NULL) &&
(ent->etype == XML_INTERNAL_PREDEFINED_ENTITY)) {
if (ent->content != NULL) {
@ -2462,6 +2467,11 @@ xmlStringLenDecodeEntities(xmlParserCtxtPtr ctxt, const xmlChar *str, int len,
xmlGenericError(xmlGenericErrorContext,
"String decoding PE Reference: %.30s\n", str);
ent = xmlParseStringPEReference(ctxt, &str);
if (ctxt->lastError.code == XML_ERR_ENTITY_LOOP)
goto int_error;
ctxt->nbentities++;
if (ent != NULL)
ctxt->nbentities += ent->nbentities;
if (ent != NULL) {
if (ent->content == NULL) {
if (xmlLoadEntityContent(ctxt, ent) < 0) {
@ -2501,6 +2511,7 @@ xmlStringLenDecodeEntities(xmlParserCtxtPtr ctxt, const xmlChar *str, int len,
mem_error:
xmlErrMemory(ctxt, NULL);
int_error:
if (rep != NULL)
xmlFree(rep);
if (buffer != NULL)
@ -3542,6 +3553,9 @@ xmlParseAttValueComplex(xmlParserCtxtPtr ctxt, int *attlen, int normalize) {
}
} else {
ent = xmlParseEntityRef(ctxt);
ctxt->nbentities++;
if (ent != NULL)
ctxt->nbentities += ent->nbentities;
if ((ent != NULL) &&
(ent->etype == XML_INTERNAL_PREDEFINED_ENTITY)) {
if (len > buf_size - 10) {
@ -4844,6 +4858,7 @@ xmlParseEntityDecl(xmlParserCtxtPtr ctxt) {
int isParameter = 0;
xmlChar *orig = NULL;
int skipped;
unsigned long oldnbent = ctxt->nbentities;
/* GROW; done in the caller */
if (CMP8(CUR_PTR, '<', '!', 'E', 'N', 'T', 'I', 'T', 'Y')) {
@ -5068,6 +5083,7 @@ xmlParseEntityDecl(xmlParserCtxtPtr ctxt) {
}
}
if (cur != NULL) {
cur->nbentities = ctxt->nbentities - oldnbent;
if (cur->orig != NULL)
xmlFree(orig);
else
@ -6477,6 +6493,11 @@ xmlParseReference(xmlParserCtxtPtr ctxt) {
if (ent == NULL) return;
if (!ctxt->wellFormed)
return;
ctxt->nbentities++;
if (ctxt->nbentities >= 500000) {
xmlFatalErr(ctxt, XML_ERR_ENTITY_LOOP, NULL);
return;
}
was_checked = ent->checked;
if ((ent->name != NULL) &&
(ent->etype != XML_INTERNAL_PREDEFINED_ENTITY)) {
@ -6537,6 +6558,7 @@ xmlParseReference(xmlParserCtxtPtr ctxt) {
xmlFreeNodeList(list);
}
} else {
unsigned long oldnbent = ctxt->nbentities;
/*
* 4.3.2: An internal general parsed entity is well-formed
* if its replacement text matches the production labeled
@ -6559,6 +6581,7 @@ xmlParseReference(xmlParserCtxtPtr ctxt) {
ret = xmlParseBalancedChunkMemoryInternal(ctxt,
value, user_data, &list);
ctxt->depth--;
} else if (ent->etype ==
XML_EXTERNAL_GENERAL_PARSED_ENTITY) {
ctxt->depth++;
@ -6571,6 +6594,7 @@ xmlParseReference(xmlParserCtxtPtr ctxt) {
xmlErrMsgStr(ctxt, XML_ERR_INTERNAL_ERROR,
"invalid entity type found\n", NULL);
}
ent->nbentities = ctxt->nbentities - oldnbent;
if (ret == XML_ERR_ENTITY_LOOP) {
xmlFatalErr(ctxt, XML_ERR_ENTITY_LOOP, NULL);
return;
@ -6629,6 +6653,7 @@ xmlParseReference(xmlParserCtxtPtr ctxt) {
}
ent->checked = 1;
}
ctxt->nbentities += ent->nbentities;
if (ent->children == NULL) {
/*
@ -11800,7 +11825,7 @@ xmlParseCtxtExternalEntity(xmlParserCtxtPtr ctx, const xmlChar *URL,
if (ctx == NULL) return(-1);
if (ctx->depth > 40) {
if ((ctx->depth > 40) || (ctx->nbentities >= 500000)) {
return(XML_ERR_ENTITY_LOOP);
}
@ -12010,7 +12035,8 @@ xmlParseExternalEntityPrivate(xmlDocPtr doc, xmlParserCtxtPtr oldctxt,
xmlChar start[4];
xmlCharEncoding enc;
if (depth > 40) {
if ((depth > 40) ||
((oldctxt != NULL) && (oldctxt->nbentities >= 500000))) {
return(XML_ERR_ENTITY_LOOP);
}
@ -12154,6 +12180,7 @@ xmlParseExternalEntityPrivate(xmlDocPtr doc, xmlParserCtxtPtr oldctxt,
oldctxt->node_seq.maximum = ctxt->node_seq.maximum;
oldctxt->node_seq.length = ctxt->node_seq.length;
oldctxt->node_seq.buffer = ctxt->node_seq.buffer;
oldctxt->nbentities += ctxt->nbentities;
ctxt->node_seq.maximum = 0;
ctxt->node_seq.length = 0;
ctxt->node_seq.buffer = NULL;
@ -12254,7 +12281,7 @@ xmlParseBalancedChunkMemoryInternal(xmlParserCtxtPtr oldctxt,
int size;
xmlParserErrors ret = XML_ERR_OK;
if (oldctxt->depth > 40) {
if ((oldctxt->depth > 40) || (oldctxt->nbentities >= 500000)) {
return(XML_ERR_ENTITY_LOOP);
}
@ -12379,6 +12406,7 @@ xmlParseBalancedChunkMemoryInternal(xmlParserCtxtPtr oldctxt,
ctxt->myDoc->last = last;
}
oldctxt->nbentities += ctxt->nbentities;
ctxt->sax = oldsax;
ctxt->dict = NULL;
ctxt->attsDefault = NULL;
@ -13695,6 +13723,7 @@ xmlCtxtReset(xmlParserCtxtPtr ctxt)
ctxt->depth = 0;
ctxt->charset = XML_CHAR_ENCODING_UTF8;
ctxt->catalogs = NULL;
ctxt->nbentities = 0;
xmlInitNodeInfoSeq(&ctxt->node_seq);
if (ctxt->attsDefault != NULL) {

1
parserInternals.c
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@ -1670,6 +1670,7 @@ xmlInitParserCtxt(xmlParserCtxtPtr ctxt)
ctxt->depth = 0;
ctxt->charset = XML_CHAR_ENCODING_UTF8;
ctxt->catalogs = NULL;
ctxt->nbentities = 0;
xmlInitNodeInfoSeq(&ctxt->node_seq);
return(0);
}