WebKit, as used in Google Chrome before 4.0.249.78 and Apple Safari, allows remote attackers to bypass intended restrictions on popup windows via crafted use of a mouse click event.

A memory leak was found in the way libpng processed malformed Portable Network Graphics (PNG) images with Physical Scale (sCAL) extension. A remote attacker could create a specially-crafted PNG image and trick the local user into opening it in an application, using the libpng library, leading to denial of service (relevant libpng-based application crash).

References: [1] http://www.libpng.org/pub/png/libpng.html

CVE Request: [2] http://www.openwall.com/lists/oss-security/2010/06/28/2

Description of problem: When transmitting L2TP frames, we derive the outgoing interface's UDP checksum hardware assist capabilities from the tunnel dst dev. This can sometimes be NULL, especially when routing protocols are used and routing changes occur. This patch just checks for NULL dst or dev pointers when checking for netdev hardware assist features. BUG: unable to handle kernel NULL pointer dereference at 0000000c IP: [<f89d074c>] pppol2tpxmit+0x341/0x4da [pppol2tp] pde = 00000000 Oops: 0000 [#1] SMP last sysfs file: /sys/class/net/lo/operstate Modules linked in: pppol2tp pppox pppgeneric slhc ipv6 dummy loop sndhdacodecatihdmi sndhdaintel sndhdacodec snd [...] Code: 8d 45 08 f0 ff 45 08 89 6b 08 c7 43 68 7e fb 9c f8 8a 45 24 83 e0 0c 3c 04 75 09 80 63 64 f3 e9 b4 00 00 00 8b 43 1 EIP: [<f89d074c>] pppol2tpxmit+0x341/0x4da [pppol2tp] SS:ESP 0068:f70a9cac CR2: 000000000000000c

Introduced in ffcebb16 (v2.6.29-rc1~581), fixed in 3feec909 (fixed in v2.6.34-rc2).

Upstream commit: http://git.kernel.org/linus/ffcebb16 http://git.kernel.org/linus/3feec909

Integer overflow in the btrfsioctlclone function in fs/btrfs/ioctl.c in the Linux kernel before 2.6.35 might allow local users to obtain sensitive information via a BTRFSIOCCLONERANGE ioctl call.

Description of problem: 1. CVE-2010-2537 - The BTRFSIOCCLONE and BTRFSIOCCLONERANGE ioctls should check whether the donor file is append-only before writing to it.

2. CVE-2010-2538 - The BTRFSIOCCLONERANGE ioctl appears to have an integer overflow that allows a user to specify an out-of-bounds range to copy from the source file (if off + len wraps around).

Upstream commit: http://git.kernel.org/linus/2ebc3464781ad24474abcbd2274e6254689853b5

Reference: https://btrfs.wiki.kernel.org/index.php/MainPage

The kernel in Red Hat Enterprise Linux 6 has support for Btrfs by default.

Description of problem: CIFS has the ability to chase MS-DFS referrals. In order to do this it has to be able to resolve hostnames into IP addresses. For this, it uses the keys API to upcall to the cifs.upcall userspace helper. It then resolves the name and hands the address back to the kernel.

The dnsresolver upcall currently used by CIFS is susceptible to cache stuffing. It's possible for a malicious user to stuff the keyring with the results of a lookup, and then trick the server into mounting a server of his choosing.

Last updated 24 July 2024

Description of problem: Reported by Nelson Elhage.

CVE-2010-3848 AFECONET kernel stack overflow CVE-2010-3849 AFECONET saddr->cookie NULL dereferences CVE-2010-3850 AFECONET SIOCSIFADDR ioctl does not check privileges

The two main vulnerabilities lie in the econetsendmsg() function. If CONFIGECONETAUNUDP, the function declares a variable-length array of iovec's on the stack:

static int econetsendmsg(struct kiocb iocb, struct socket sock, struct msghdr msg, sizet len) { ... #ifdef CONFIGECONETAUNUDP ... struct iovec iov[msg->msgiovlen+1]; ... #endif

"msg->msgiovlen" is a user-controlled value <= 1024; 1024 'struct iovec's is enough to overflow the kernel stack and clobber the 'threadinfo' struct on either 32- or 64-bit systems with or without CONFIG4KSTACKS.

The code populates 'iov' with user-controlled values, so this is almost certainly exploitable for privesc.

The second bug is conveniently labeled as such for anyone who cares to look:

/ BUG: saddr may be NULL / eb->cookie = saddr->cookie;

In fact, 'saddr' comes from userspace and may be NULL (if non-NULL, it will have been copied to kernelspace), leading to a NULL-pointer dereference. This saddr->cookie dereference appears twice, once in the "hardware" case and once in the "UDP emulation" case. This is easily exploitable for an oops, but probably not anything more.

The final issue is in the ecdevioctl function. The SIOCSIFADDR ioctl does not check privileges, allowing an unprivileged user to assign econet addresses to arbitrary interfaces. It is possible this is intentional, but AFAIK it would be unusual for SIOCSIFADDR to be unprivileged, so this may be an accident.

Note that it is necessary to use this property in order to make the first two bugs exploitable, since econetsendmsg will return almost immediately if no econet addresses are configured.

Reference: http://seclists.org/oss-sec/2010/q4/236

Description of problem: On a 32-bit machine, info.rulecnt >= 0x40000000 leads to integer overflow and the buffer may be smaller than needed. Since ETHTOOLGRXCLSRLALL is unprivileged, this can presumably be used for at least denial of service.

Reference: http://thread.gmane.org/gmane.linux.network/164869

Description of problem: CVE-2007-4573 regression

Reintroduced in v2.6.27-rc1 via commit d4d67150.

Upstream commits: http://git.kernel.org/linus/36d001c70d8a0144ac1d038f6876c484849a74de http://git.kernel.org/linus/eefdca043e8391dcd719711716492063030b55ac

References: http://sota.gen.nz/compat2/

Acknowledgements:

Red Hat would like to thank Ben Hawkes for reporting this issue.

Description of problem: http://lkml.org/lkml/2010/9/11/168 The EQLGETMASTRCFG device ioctl allows unprivileged users to read 16 bytes of uninitialized stack memory, because the "mastername" member of the masterconfigt struct declared on the stack in eqlgmastercfg() is not altered or zeroed before being copied back to the user.

Acknowledgements:

Red Hat would like to thank Dan Rosenberg for reporting this issue.

Description of problem: http://lkml.org/lkml/2010/9/11/170 The CHELSIOGETQSETNUM device ioctl allows unprivileged users to read 4 bytes of uninitialized stack memory, because the "addr" member of the chreg struct declared on the stack in cxgbextensionioctl() is not altered or zeroed before being copied back to the user.

Acknowledgements:

Red Hat would like to thank Dan Rosenberg for reporting this issue.

Description of problem: http://lkml.org/lkml/2010/9/11/167

The TIOCGICOUNT device ioctl allows unprivileged users to read 9 bytes of uninitialized stack memory, because the "reserved" member of the serialicounterstruct struct declared on the stack in hsogetcount() is not altered or zeroed before being copied back to the user. This patch takes care of it.

Acknowledgements:

Red Hat would like to thank Dan Rosenberg for reporting this issue.

Last updated 24 July 2024

Description of problem: Changes to tty to use struct pid happened here: ab521dc0f8e117fd808d3e425216864d60390500

mrg-1/rhel-6 are missing: 1) redo locking of tty->pgrp 47f86834bbd4193139d61d659bebf9ab9d691e37 2) tty: fix race in ttyfasync 703625118069f9f8960d356676662d3db5a9d116 3) fnctl: fmodown should call writelockirqsave/restore b04da8bfdfbbd79544cab2fadfdc12e87eb01600

Buffer overflow in pngpread.c in libpng before 1.2.44 and 1.4.x before 1.4.3, as used in progressive applications, might allow remote attackers to execute arbitrary code via a PNG image that triggers an additional data row.

Description of problem: Calling ETHTOOLGRXCLSRLALL with a large rulecnt will allocate kernel heap without clearing it. For the one driver (niu) that implements it, it will leave the unused portion of heap unchanged and copy the full contents back to userspace.

This is different from CVE-2010-2478, but was introduced at the same time (0853ad66, 2.6.27-rc1).

Upstream commit: http://git.kernel.org/linus/ae6df5f96a51818d6376da5307d773baeece4014

Acknowledgements:

Red Hat would like to thank Kees Cook for reporting this issue.

Description of problem: The CONFIGSTACKGROWSDOWN variant of setupargpages() does not check the size of the argument/environment area on the stack. When it is unworkably large, shiftargpages() hits its BUGON. This is exploitable with a very large RLIMITSTACK limit, to create a crash pretty easily. Check that the initial stack is not too large to make it possible to map in any executable. We're not checking that the actual executable (or intepreter, for binfmtelf) will fit. So those mappings might clobber part of the initial stack mapping. But that is just userland lossage that userland made happen, not a kernel problem.

Upstream commit: http://git.kernel.org/linus/1b528181b2ffa14721fb28ad1bd539fe1732c583

Reference: http://grsecurity.net/~spender/64bitdos.c

Acknowledgements:

Red Hat would like to thank Brad Spengler for reporting this issue.

Last updated 24 July 2024

Description of problem: User "foo" can use the SWAPEXT ioctl to swap a write-only file owned by user "bar" into a file owned by "foo" and subsequently reading it. It does so by checking that the file descriptors passed to the ioctl are also opened for reading.

References: http://archives.free.net.ph/message/20100616.130710.301704aa.en.html http://archives.free.net.ph/message/20100616.135735.40f53a32.en.html

Description of problem: If the donor file is an append-only file, we should not allow the operation to proceed, lest we end up overwriting the contents of an append-only file.

Upstream commit: http://git.kernel.org/linus/1f5a81e41f8b1a782c68d3843e9ec1bfaadf7d72

Devin Carraway of the Debian Security Team discovered that the upstream fix for the CVE-2008-2079 is incomplete and still makes it possible for local users to create tables via INDEX/DATA DIRECTORY directives in the MySQL data directory (/var/lib/mysql) via directory symlinks.

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=480292#25

CVE-2008-2079 was tracked via bug bug #445222.

An attacker needs following to exploit this issue: - MySQL database account with privileges to create tables - shell access to the host running MySQL database with write access to a directory accessible by the mysqld daemon process

Heap-based buffer overflow in pcrecompile.c in the Perl-Compatible Regular Expression (PCRE) library 7.7 allows context-dependent attackers to cause a denial of service (crash) or possibly execute arbitrary code via a regular expression that begins with an option and contains multiple branches.

Will Drewry of the Google Security Team created a set of fuzzed OGG test files to test OGG Vorbis and Tremor implementations. Some of them were causing memory corruption and crash on old libvorbis versions (prior to 1.0).

Crash / corruption occurred in makedecodetree(). This function was removed prior to the release of upstream version 1.0 in following changes:

https://trac.xiph.org/changeset/2959 https://trac.xiph.org/changeset/2960

Test files do not crash libvobis revision 2960 or later.

Common Vulnerabilities and Exposures assigned an identifier CVE-2009-4484 to the following vulnerability:

Buffer overflow in the server in MySQL 5.0.51a on Linux allows remote attackers to execute arbitrary code via crafted data to TCP port 3306, as demonstrated by the vdmysql5 module in VulnDisco Pack Professional 8.11. NOTE: as of 20100106, this disclosure has no actionable information. However, because the VulnDisco Pack author is a reliable researcher, the issue is being assigned a CVE identifier for tracking purposes.

References: http://intevydis.blogspot.com/2010/01/jan-4-2010-mysql-exploit-demo.html http://intevydis.com/vd-list.shtml http://isc.sans.org/diary.html?storyid=7900 http://www.securityfocus.com/bid/37640

More details about the issue may be disclosed in about 2 weeks: http://intevydis.blogspot.com/2010/01/jan-72010-0day-awareness.html

The pollmodeio file for the megaraidsas driver in the Linux kernel 2.6.31.6 and earlier has world-writable permissions, which allows local users to change the I/O mode of the driver by modifying this file.

The connector layer in the Linux kernel before 2.6.31.5 does not require the CAPSYSADMIN capability for certain interaction with the (1) uvesafb, (2) pohmelfs, (3) dst, or (4) dm subsystem, which allows local users to bypass intended access restrictions and gain privileges via calls to functions in these subsystems.

net/unix/afunix.c in the Linux kernel 2.6.31.4 and earlier allows local users to cause a denial of service (system hang) by creating an abstract-namespace AFUNIX listening socket, performing a shutdown operation on this socket, and then performing a series of connect operations to this socket.

Multiple race conditions in fs/pipe.c in the Linux kernel before 2.6.32-rc6 allow local users to cause a denial of service (NULL pointer dereference and system crash) or gain privileges by attempting to open an anonymous pipe via a /proc//fd/ pathname.

Use-after-free vulnerability in the abstract file-descriptor handling interface in the cupsdDoSelect function in scheduler/select.c in the scheduler in cupsd in CUPS 1.3.7 and 1.3.10 allows remote attackers to cause a denial of service (daemon crash or hang) via a client disconnection during listing of a large number of print jobs, related to improperly maintaining a reference count. NOTE: some of these details are obtained from third party information.