Description: There exists a denial of service problem in libxml's UTF-8 decoding functions. The xmlCurrentChar() function does not check UTF-8 correctness and certain multibyte combinations can cause the library to enter an infinite loop and hang, consuming system resources. It is strongly recommended to upgrade if your application accepts arbitrary xml user input.
Provided by: The issue was originally discovered at Google by Brad Fitzpatrick and further investigated by Peter Valchev and Will Drewry. Patch and debugging by Daniel Veillard (libxml).
Acknowledgements:
Red Hat would like to thank the Google Security Team for responsibly disclosing this issue.
Buffer overflow in the polymorphic opcode support in the Regular Expression Engine (regcomp.c) in Perl 5.8 allows context-dependent attackers to execute arbitrary code by switching from byte to Unicode (UTF) characters in a regular expression.
Heap-based buffer overflow in libmpdemux/aviheader.c in MPlayer 1.0rc1 and earlier allows remote attackers to cause a denial of service (application crash) or possibly execute arbitrary code via a .avi file with certain large "indx truck size" and nEntriesInuse values, and a certain wLongsPerEntry value.
Dirk Mueller reported an off by one buffer overflow flaw in the way QT parses certain unicode strings.
To quote Dirk:
Ive found a off-by-one buffer overflow in QUtf8Decoder::toUnicode(). It is not exploitable with Qt 4.x or above because there is an additional QChar(0) being allocated in QString, however it is still a bug there, as the array returned by utf16() etc is no longer terminated properly.
Emacs 21 allows user-assisted attackers to cause a denial of service (crash) via certain crafted images, as demonstrated via a GIF image in vm mode, related to image size calculation.
Integer overflow in the FontFileInitTable function in X.Org libXfont before 20070403 allows remote authenticated users to execute arbitrary code via a long first line in the fonts.dir file, which results in a heap overflow.
Integer overflow in the bdfReadCharacters function in bdfread.c in (1) X.Org libXfont before 20070403 and (2) freetype 2.3.2 and earlier allows remote authenticated users to execute arbitrary code via crafted BDF fonts, which result in a heap overflow.
The ReadRequestFromClient function in server/os/io.c in Network Audio System (NAS) before 1.8a SVN 237 allows remote attackers to cause a denial of service (crash) via multiple simultaneous connections, which triggers a NULL pointer dereference.
Array index error in Network Audio System (NAS) before 1.8a SVN 237 allows remote attackers to cause a denial of service (crash) via (1) large numaction values in the ProcAuSetElements function in server/dia/audispatch.c or (2) a large inputNum parameter to the compileInputs function in server/dia/auutil.c.
The AddResource function in server/dia/resource.c in Network Audio System (NAS) before 1.8a SVN 237 allows remote attackers to cause a denial of service (server crash) via a nonexistent client ID.
Stack-based buffer overflow in the acceptattlocal function in server/os/connection.c in Network Audio System (NAS) before 1.8a SVN 237 allows remote attackers to execute arbitrary code via a long path slave name in a USL socket connection.
Integer overflow in the ProcAuWriteElement function in server/dia/audispatch.c in Network Audio System (NAS) before 1.8a SVN 237 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via a large maxsamples value.
kdesu in kdelibs package creates world readable temporary files containing authentication info, which can allow local users to gain privileges.
BitchX IRC client does not properly cleanse an untrusted format string, which allows remote attackers to cause a denial of service via an invite to a channel whose name includes special formatting characters.