shopify-scripts: Segmentation fault when a Ruby method is invoked by a C method via Object#send

We can arrange for C to call Objectsend by aliasing it over initialize. This will cause Classnew a C function to call initialize which is actually Objectsend with arbitrary arguments. If we invoke a Ruby method through Objectsend, mruby segfaults: def foo end class X aliasmethod :initialize, :sen...

shopify-scripts: Segfault and/or potential unwanted (byte)code execution with "break" and "||=" inside a loop

Introduction ============ Certain invalid inputs invalid Ruby programs crash mruby and mrubyengine including the parent MRI VM. The programs always involve the ||= operator, loops and the break keyword. Proof of Concept ================ crash.rb -------- A ||= break while break 1. Save the above...

shopify-scripts: SIGSEGV on mruby's mark_tbl() (Invalid memory access)

There is an invalid memory access on mruby when calling to marktbl which causes a SIGSEGV and leads to denial of service. Sample The following code triggers the bug attached as marktbl.min2.rb: ruby t0me=% Array.new9t0me.empty?s=Array.new9%0 s=Array.dup.new23 Array0 Array0..6 Crash Here we can se...

shopify-scripts: Broken handling of maximum number of method call arguments leads to segfault

Introduction ============ Improper logic for handling of maximum number of method call arguments leads to dereferencing an invalid pointer in some cases, which causes a segfault in both mruby and mrubyengine and the parent MRI. The crash only happens when the number of arguments, n == CALLMAXARGS...

php: wddx_deserialize allows illegal memory access

The phpwddxprocessdata function in ext/wddx/wddx.c in PHP before 5.6.25 and 7.x before 7.0.10 allows remote attackers to cause a denial of service segmentation fault or possibly have unspecified other impact via an invalid ISO 8601 time value, as demonstrated by a wddxdeserialize call that...

php: xml_parse_into_struct() can crash when XML parser is re-used

The xmlparseintostruct function in ext/xml/xml.c in PHP before 5.5.35, 5.6.x before 5.6.21, and 7.x before 7.0.6 allows remote attackers to cause a denial of service buffer under-read and segmentation fault or possibly have unspecified other impact via crafted XML data in the second argument,...

shopify-scripts: SIGSEV on mrb_ary_splice

Sample The following code causes a SIGSEV when executed under the sandbox t0me=methods t0me0,0=t0me Crash Here we can see the crash full crash output attached $ bin/sandbox /tmp/mrbarysplice-crash.rb bin/sandbox:21: BUG Segmentation fault at 0x00005200000004 ruby 2.3.1p112 2016-04-26...

shopify-scripts: Segfault in mruby, mruby_engine and the parent MRI Ruby due to null pointer dereference

Introduction ============ Certain valid Ruby programs are able to cause a segmentation fault in mruby through a null pointer derefence, which in turn leads to a crash in mrubyengine and the parent MRI Ruby process. Proof of concept ================ crash.rb: --------- def method yield end method&...

shopify-scripts: Range#initialize_copy null pointer dereference

Heya! It's possible to segfault mruby through mruby-engine with the following snippet of code: Range.removemethod:initializecopy 1..2.dup.tos This can be triggered through mruby-engine like this: MRubyEngine.new5121024, 1000, 1000.sandboxeval"/tmp", % Range.removemethod:initializecopy 1..2.dup.to...

ntp: ntpd crash when processing config commands with statistics type

It was found that ntpd would exit with a segmentation fault when a statistics type that was not enabled during compilation e.g. timingstats was referenced by the statistics or filegen configuration command...

Moderate: Red Hat Security Advisory: ntp security and bug fix update

An update for ntp is now available for Red Hat Enterprise Linux 7. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System CVSS base score, which gives a detailed severity rating, is available for each vulnerability from the CV...

MGASA-2016-0361 Updated libtiff packages fix security vulnerability

The TIFFWriteDirectoryTagLongLong8Array function in tifdirwrite.c in the tiffset tool in LibTIFF 4.0.6 and earlier allows remote attackers to cause a denial of service out-of-bounds read via vectors involving the ma variable CVE-2016-3658. They also fix: An out-of-bound read of up to 3 bytes in...

Caph 1.1 Local Denial Of Service

Caph DOS Exploit by NA . Crashes the program and produces a segmentation fault Tested upon Kali Linux. Discovered by NA , NA at tutanota.com Description ============ It is a sandbox game, based on physics. The game aim is to make contact red object with green object. You can use various objects,...

New IoT Botnet Malware Borrows From Mirai

Researchers have thrown back the covers on more malware infecting IoT devices for the purposes of building a botnet that carries out DDoS attacks. This sample has its roots in other IoT botnets such as Aidra, Bashlite and Mirai in that it attacks weak telnet credentials guarding devices and it’s...

Mirai Vulnerability Disclosed, But Exploits May Constitute Hacking Back

The Mirai botnet apparently has a weakness that could shut down its ability to flood targets with HTTP requests. But exploiting that vulnerability puts defenders in a gray area with regard to hacking back. Researchers at Invincea Labs discovered three vulnerabilities in Mirai, one of which is the...

Debian DLA-669-1 : dwarfutils security update

Several vulnerabilities were discovered in dwarfutils, a tool and library for reading/consuming and writing/producing DWARF debugging information. The Common Vulnerabilities and Exposures project identifies the following issues : CVE-2015-8538 A specially crafted ELF file can cause a segmentation...

openSUSE Security Update : systemd (openSUSE-2016-1194)

This update for systemd fixes the following security issue : - CVE-2016-7796: A zero-length message received over systemd's notification socket could make managerdispatchnotifyfd return an error and, as a side effect, disable the notification handler completely. As the notification socket is...

openSUSE Security Update : libreoffice (openSUSE-2016-1192)

LibreOffice was updated to version 5.1.5.2, bringing enhancements and bug fixes. - CVE-2016-4324: Parsing the Rich Text Format character style index was insufficiently checked for validity. Documents could be constructed which dereference an iterator to the first entry of an empty STL container...

Security update for systemd (important)

This update for systemd fixes the following security issue: - CVE-2016-7796: A zero-length message received over systemd's notification socket could make managerdispatchnotifyfd return an error and, as a side effect, disable the notification handler completely. As the notification socket is...

Internet Bug Bounty: Stack Buffer Overflow in GD dynamicGetbuf

Stack-based buffer over flow in GD dynamicGetbuf - Vulnerable function: imagecreatefromstring - Bug has been reported: https://bugs.php.net/bug.php?id=73280 - Submitted a patch and accepted: https://github.com/php/php-src/commit/cc08cbc84d46933c1e9e0149633f1ed5d19e45e9 - Impact: Remotely...