Hi, attached is a patch for an NMU. It will be also archived on: http://people.debian.org/~nion/nmu-diff/libxml2-2.6.30.dfsg-3_2.6.30.dfsg-3.1.patch
Please ping me in case you have no time to do an upload in reasonable time. Kind regards Nico -- Nico Golde - http://www.ngolde.de - [EMAIL PROTECTED] - GPG: 0x73647CFF For security reasons, all text in this mail is double-rot13 encrypted.
diff -u libxml2-2.6.30.dfsg/debian/changelog libxml2-2.6.30.dfsg/debian/changelog
--- libxml2-2.6.30.dfsg/debian/changelog
+++ libxml2-2.6.30.dfsg/debian/changelog
@@ -1,3 +1,13 @@
+libxml2 (2.6.30.dfsg-3.1) unstable; urgency=high
+
+ * Non-maintainer upload by security team.
+ * This update addresses the following security issue:
+ - CVE-2007-6284: The xmlCurrentChar function allows context-dependent
+ attackers to cause a denial of service (infinite loop) via XML
+ containing invalid UTF-8 sequences (Closes: #460292).
+
+ -- Nico Golde <[EMAIL PROTECTED]> Sun, 13 Jan 2008 15:15:04 +0100
+
libxml2 (2.6.30.dfsg-3) unstable; urgency=low
* debian/libxml2.symbols: Add a symbols file to benefit from the new
only in patch2:
unchanged:
--- libxml2-2.6.30.dfsg.orig/parserInternals.c
+++ libxml2-2.6.30.dfsg/parserInternals.c
@@ -638,14 +638,13 @@
c = *cur;
if (c & 0x80) {
- if (c == 0xC0)
+ if (((c & 0x40) == 0) || (c == 0xC0))
goto encoding_error;
if (cur[1] == 0)
xmlParserInputGrow(ctxt->input, INPUT_CHUNK);
if ((cur[1] & 0xc0) != 0x80)
goto encoding_error;
if ((c & 0xe0) == 0xe0) {
-
if (cur[2] == 0)
xmlParserInputGrow(ctxt->input, INPUT_CHUNK);
if ((cur[2] & 0xc0) != 0x80)
@@ -662,18 +661,24 @@
val |= (cur[1] & 0x3f) << 12;
val |= (cur[2] & 0x3f) << 6;
val |= cur[3] & 0x3f;
+ if (val < 0x10000)
+ goto encoding_error;
} else {
/* 3-byte code */
*len = 3;
val = (cur[0] & 0xf) << 12;
val |= (cur[1] & 0x3f) << 6;
val |= cur[2] & 0x3f;
+ if (val < 0x800)
+ goto encoding_error;
}
} else {
/* 2-byte code */
*len = 2;
val = (cur[0] & 0x1f) << 6;
val |= cur[1] & 0x3f;
+ if (val < 0x80)
+ goto encoding_error;
}
if (!IS_CHAR(val)) {
xmlErrEncodingInt(ctxt, XML_ERR_INVALID_CHAR,
@@ -683,6 +688,13 @@
} else {
/* 1-byte code */
*len = 1;
+ if (*ctxt->input->cur == 0)
+ xmlParserInputGrow(ctxt->input, INPUT_CHUNK);
+ if ((*ctxt->input->cur == 0) &&
+ (ctxt->input->end > ctxt->input->cur)) {
+ xmlErrEncodingInt(ctxt, XML_ERR_INVALID_CHAR,
+ "Char 0x%X out of allowed range\n", val);
+ }
if (*ctxt->input->cur == 0xD) {
if (ctxt->input->cur[1] == 0xA) {
ctxt->nbChars++;
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