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(c) SANS Internet Storm Center. https://isc.sans.edu Creative Commons Attribution-Noncommercial 3.0 United States License.
 

(credit: Carl Lender)

A newly disclosed vulnerability could allow attackers to seize control of mobile phones and key parts of the world's telecommunications infrastructure and make it possible to eavesdrop or disrupt entire networks, security experts warned Tuesday.

The bug resides in a code library used in a wide range of telecommunication products, including radios in cell towers, routers, and switches, as well as the baseband chips in individual phones. Although exploiting the heap overflow vulnerability would require great skill and resources, attackers who managed to succeed would have the ability to execute malicious code on virtually all of those devices. The code library was developed by Pennsylvania-based Objective Systems and is used to implement a telephony standard known as ASN.1, short for Abstract Syntax Notation One.

"The vulnerability could be triggered remotely without any authentication in scenarios where the vulnerable code receives and processes ASN.1 encoded data from untrusted sources," researchers who discovered the flaw wrote in an advisory published Monday evening. "These may include communications between mobile devices and telecommunication network infrastructure nodes, communications between nodes in a carrier's network or across carrier boundaries, or communication between mutually untrusted endpoints in a data network."

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*Queue Back to the Future Music* Over more than a decade ago there was a major discovery in ASN.1 that contributed to arguably one of the worst vulnerabilities in a long time. Fast forward *Queue awful fast forward tape music* to 2016 and ASN.1 is here again. Please reference this link https://github.com/programa-stic/security-advisories/tree/master/ObjSys/CVE-2016-5080 for the major details as this unfolds regarding CVE-2016-5080.

So far, according to the CERT page [3] for vendors reporting in and so far our winners of the ASN.1 award seem to be Objective Systems and Qualcomm Incorporated are reporting impact from CVE-2016-5080. Honeywell and Hewlett Packard Enterprise are reporting Not Affected. Many other vendors are in an unknown state.

Wait Richard, what the h^ is ASN.1? [4] ASN.1 is a standard that is jointly maintained and governed by the International Organization for Standardization (ISO), International Electrotechnical Commission (IEC), and International Telecommunication Union (ITU-T). It is a syntax notation that makes up rules for encoding, transmitting, and decoding data [4]. Basically, it does A LOT of stuff and it is EVERYWHERE *a slightly panicked tone*.

Please review this CVE (CVE-2016-5080) and monitor it closely. We at the storm center will monitor this and update it as it unfolds.

[1] https://www.sans.org/reading-room/whitepapers/protocols/snmp-potential-asn1-vulnerabilities-912

[2] https://github.com/programa-stic/security-advisories/tree/master/ObjSys/CVE-2016-5080

[3] http://www.kb.cert.org/vuls/id/790839

[4] https://en.wikipedia.org/wiki/Abstract_Syntax_Notation_One

(c) SANS Internet Storm Center. https://isc.sans.edu Creative Commons Attribution-Noncommercial 3.0 United States License.
 

(credit: JaviDex)

If you've visited the do-it-yourself project site of Dunlop Adhesives, the official tourism site for Guatemala, or a number of other legitimate (or in some cases, marginally legitimate) websites, you may have gotten more than the information you were looking for. These sites are redirecting visitors to a malicious website that attempts to install CryptXXX—a strain of cryptographic ransomware first discovered in April.

The sites were most likely exploited by a botnet called SoakSoak or a similar automated attack looking for vulnerable WordPress plugins and other unpatched content management tools, according to a report from researchers at the endpoint security software vendor Invincea. SoakSoak, named for the Russian domain it originally launched from, has been around for some time and has exploited thousands of websites. In December of 2014, Google was forced to blacklist over 11,000 domains in a single day after the botnet compromised their associated websites by going after the WordPress RevSlider plugin.

In this recent wave of compromises, SoakSoak planted code that redirects visitors to a website hosting the Neutrino Exploit Kit, a "commercial" malware dropping Web tool sold through underground marketplaces. The latest string of compromises appears to have begun in May. But since then, both the malware kit and the ransomware have been upgraded. The latest version of the exploit kit attempts to evade security software or virtual machines.

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I received another malicious Office document.

oledump.py shows it contains VBA macros, but also a userform (A4 - A7).

Before we look at the VBA macros, we" />

It looks like it contains BASE64 text. Let" />

Not all text is recognized as valid BASE64. Let" />

Its clear now that this is valid BASE64, and that the decoded text starts with %COMSPEC% ...

So let" />

Now it" />

When we analyze the VBA macros, we will find code that references the userform to concatenate the BASE64 text. It then decodes it and executes it.

But this time, just by poking a bit at the BASE64 text, we were able to recover the malicious payload.

Didier Stevens
Microsoft MVP Consumer Security
blog.DidierStevens.com DidierStevensLabs.com

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