Last updated 24 July 2024
The pngdecompresschunk function in pngrutil.c in libpng 1.0.x before 1.0.53, 1.2.x before 1.2.43, and 1.4.x before 1.4.1 does not properly handle compressed ancillary-chunk data that has a disproportionately large uncompressed representation, which allows remote attackers to cause a denial of service (memory and CPU consumption, and application hang) via a crafted PNG file, as demonstrated by use of the deflate compression method on data composed of many occurrences of the same character, related to a "decompression bomb" attack.
Last updated 24 July 2024
The kgacceptkrb5 function in krb5/acceptseccontext.c in the GSS-API library in MIT Kerberos 5 (aka krb5) through 1.7.1 and 1.8 before 1.8.2, as used in kadmind and other applications, does not properly check for invalid GSS-API tokens, which allows remote authenticated users to cause a denial of service (NULL pointer dereference and daemon crash) via an AP-REQ message in which the authenticator's checksum field is missing.
XMLScanner.java in Apache Xerces2 Java, as used in Sun Java Runtime Environment (JRE) in JDK and JRE 6 before Update 15 and JDK and JRE 5.0 before Update 20, and in other products, allows remote attackers to cause a denial of service (infinite loop and application hang) via malformed XML input, as demonstrated by the Codenomicon XML fuzzing framework.
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
A flaw was found in the way iommu mapping failures were handled in kvmiommumappages() function in the Linux kernel. A privileged user in the guest could use this flaw to crash the host in case the guest has access to passed in device.
Acknowledgements:
Red Hat would like to thank Jack Morgenstein of Mellanox for reporting this issue; the security impact of this issue was discovered by Michael Tsirkin of Red Hat.
ISSUE DESCRIPTION =================
Xen PCI backend driver does not perform proper sanity checks on the device's state.
Which in turn allows the generic MSI code (called by Xen PCI backend) to be called incorrectly leading to hitting BUG conditions or causing NULL pointer exceptions in the MSI code.
To exploit this the guest can craft specific sequence of XENPCIOP operations which will trigger this.
Furthermore the frontend can also craft an continous stream of XENPCIOPenablemsi which will trigger an continous stream of WARN() messages triggered by the MSI code leading to the logging in the initial domain to exhaust disk space.
Lastly there is also missing check to verify whether the device has memory decoding enabled set at the start of the day leading the initial domain "accesses to the respective MMIO or I/O port ranges would - - on PCI Express devices - [which can] lead to Unsupported Request responses. The treatment of such errors is platform specific." (from XSA-120). Note that if XSA-120 'addendum' patch has been applied this particular sub-issue is not exploitable.
IMPACT ======
Malicious guest administrators can cause denial of service. If driver domains are not in use, the impact is a host crash.
Only x86 systems are vulnerable. ARM systems are not vulnerable.
VULNERABLE SYSTEMS ==================
This bug affects systems using Linux as the driver domain, including non-disaggregated systems using Linux as dom0.
Linux versions v3.1 and onwards are vulnerable due to supporting PCI pass-through backend driver.
PV and HVM guests which have been granted access to physical PCI devices (PCI passthrough') can take advantage of this vulnerability.
Furthermore, the vulnerability is only applicable when the passed-through PCI devices are MSI-capable or MSI-X. (Most modern devices are).
MITIGATION ==========
Not using PCI passthrough for PV and HVM guests. Note that for HVM guests QEMU is used for PCI passthrough - however the toolstack sets up also the 'PV' PCI which the guest can utilize if it chooses to do so.
External References:
http://xenbits.xen.org/xsa/advisory-157.html
Acknowledgements:
Red Hat would like to thank the Xen project for reporting this issue.
GNOME NetworkManager allows remote attackers to cause a denial of service (IPv6 traffic disruption) via a crafted MTU value in an IPv6 Router Advertisement (RA) message, a different vulnerability than CVE-2015-8215.
Description of problem: BUG: unable to handle kernel NULL pointer dereference at 00000004 IP: [<f7f06dca>] hashbindelete+0x14/0xad [irda] pdpt = 0000000000a57001 pde = 0000000000000000 Oops: 0000 [#1] SMP last sysfs file: /sys/devices/virtual/dmi/id/sysvendor Modules linked in: irda crcccitt fuse ip6tREJECT nfconntrackipv6 ip6tablefilter ip6tables ipv6 vmblock vsock vmmemctl vmhgfs uinput pcnet32 ppdev vmxnet microcode parportpc parport mii vmci i2cpiix4 i2ccore mptspi mptscsih mptbase scsitransportspi [last unloaded: scsiwaitscan]
Pid: 2403, comm: a.out Not tainted 2.6.33.6-147.2.4.fc13.i686.PAE #1 440BX Desktop Reference Platform/VMware Virtual Platform EIP: 0060:[<f7f06dca>] EFLAGS: 00010282 CPU: 0 EIP is at hashbindelete+0x14/0xad [irda] EAX: 00000000 EBX: 00000000 ECX: f2f97f4c EDX: f7f084aa ESI: df1b8800 EDI: f7f084aa EBP: eb19bd78 ESP: eb19bd64 DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 Process a.out (pid: 2403, ti=eb19a000 task=f2ed9980 task.ti=eb19a000) Stack: 00000000 00000202 eb0df2c0 df1b8800 df1a6770 eb19bd84 f7f085f5 eb0df2c0 <0> eb19bd90 f7f0861f eb20c400 eb19bda4 f7f0a958 df1b8800 f7f0ebe4 df1a6770 <0> eb19bdb4 c06ef16e f2e21100 00000008 eb19bdbc c06ef1cf eb19bde0 c04d183a Call Trace: [<f7f085f5>] ? iriasdeleteobject+0x1b/0x2c [irda] [<f7f0861f>] ? iriasdeleteobject+0x19/0x1e [irda] [<f7f0a958>] ? irdarelease+0x65/0x127 [irda] [<c06ef16e>] ? sockrelease+0x14/0x59 [<c06ef1cf>] ? sockclose+0x1c/0x20 [<c04d183a>] ? fput+0xea/0x181 [<c04d18e4>] ? fput+0x13/0x15 [<c04cef5f>] ? filpclose+0x51/0x5b [<c043f260>] ? putfilesstruct+0x5f/0xb3 [<c043f2e8>] ? exitfiles+0x34/0x38 [<c0440a1b>] ? doexit+0x200/0x615 [<c044c4c0>] ? dequeuesignal+0xb1/0x120 [<c0440e9b>] ? dogroupexit+0x6b/0x94 [<c044c89d>] ? getsignaltodeliver+0x36e/0x389 [<c0407cd4>] ? dosignal+0x5a/0x6f4 [<c078359d>] ? apictimerinterrupt+0x31/0x38 [<c0455f57>] ? hrtimernanosleep+0x94/0xdc [<c04d7376>] ? pathput+0x15/0x18 [<c047c6a6>] ? auditsyscallexit+0xfa/0x10f [<c040838d>] ? donotifyresume+0x1f/0x79 [<c07831e4>] ? worknotifysig+0x13/0x1b Code: 04 01 74 0b 8b 55 f0 8d 43 0c e8 b8 bf 87 c8 83 c4 0c 5b 5e 5f 5d c3 55 89 e5 57 89 d7 56 53 89 c3 83 ec 08 c7 45 ec 00 00 00 00 <f6> 40 04 01 74 0b 8d 40 0c e8 40 bf 87 c8 89 45 ec 89 de c7 45 EIP: [<f7f06dca>] hashbindelete+0x14/0xad [irda] SS:ESP 0068:eb19bd64 CR2: 0000000000000004 ---[ end trace 8c5fb89ec896b3a8 ]--- Fixing recursive fault but reboot is needed!
Acknowledgements:
Red Hat would like to thank Tavis Ormandy for reporting this issue.
A path traversal vulnerability in the web application component of Micro Focus Filr 3.x allows a remote attacker authenticated as a low privilege user to download arbitrary files from the Filr server. This vulnerability affects all versions of Filr 3.x prior to Security Update 6.
Description of problem: It requires debugfs to be mounted on a local system
$ mount | grep debugfs none on /sys/kernel/debug type debugfs (rw) none on /var/lib/ureadahead/debugfs type debugfs (rw,relatime)
Tested with Ubuntu Maverick 10.04.1 with kernel 2.6.32-24-generic-pae. It's probably not exploitable in any meaningful way, although it produces page fault in kernel mode, and makes subsequent processes opening /sys/kernel/debug/tracing/setftracefilter (or setftracenotrace) unkillable, so it's a little bit of a DoS (or at least, annoyance).
Found via one of Tavis Ormandy's tools, I just quickly analyzed it and provided a testcase.
Acknowledgements:
Red Hat would like to thank Robert Swiecki of Google Security Team for reporting this issue.
The gnutlsx509verifycertificate function in lib/x509/verify.c in libgnutls in GnuTLS before 2.6.1 trusts certificate chains in which the last certificate is an arbitrary trusted, self-signed certificate, which allows man-in-the-middle attackers to insert a spoofed certificate for any Distinguished Name (DN).
The modproxyftp module in the Apache HTTP Server allows remote attackers to bypass intended access restrictions and send arbitrary commands to an FTP server via vectors related to the embedding of these commands in the Authorization HTTP header, as demonstrated by a certain module in VulnDisco Pack Professional 8.11. NOTE: as of 20090903, 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.com/vd-list.shtml
Mozilla Firefox before 3.0.12 does not always use XPCCrossOriginWrapper when required during object construction, which allows remote attackers to bypass the Same Origin Policy and conduct cross-site scripting (XSS) attacks via a crafted document, related to a "cross origin wrapper bypass."
The inode double locking code in fs/ocfs2/file.c in the Linux kernel 2.6.30 before 2.6.30-rc3, 2.6.27 before 2.6.27.24, 2.6.29 before 2.6.29.4, and possibly other versions down to 2.6.19 allows local users to cause a denial of service (prevention of file creation and removal) via a series of splice system calls that trigger a deadlock between the genericfilesplicewrite, splicefrompipe, and ocfs2filesplicewrite functions.
libxml2 before 2.7.8, as used in Google Chrome before 7.0.517.44, Apple Safari 5.0.2 and earlier, and other products, reads from invalid memory locations during processing of malformed XPath expressions, which allows context-dependent attackers to cause a denial of service (application crash) via a crafted XML document.