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Bruno Souza

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Bruno Souza

Why vlang? V is a featured, productive, safe and confortable language highly compatible with c, that generates neat binaries with c-speed, the decompilation also seems quite clear as c code.
https://vlang.io/

After open the binary with radare in debug mode "-d" we proceed to do the binary recursive analysis with "aaaa" the more a's the more deep analys.

The function names are modified when the binary is crafted, if we have a function named hello in a module named main we will have the symbol main__hello, but we can locate them quicly thanks to radare's grep done with "~" token in this case applied to the "afl" command which lists all the symbols.

Being in debug mode we can use "d*" commands, for example "db" for breakpointing the function and then "dc" to start or continue execution.

Let's dissasemble the function with "pD" command, it also displays the function variables and arguments as well, note also the xref "call xref from main"

Let's take a look to the function arguments, radare detect's this three 64bits registers used on the function.

Actually the function parameter is rsi that contains a testing html to test the href extraction algorithm.

The string structure is quite simple and it's plenty of implemented methods.

With F8 we can step over the code as we were in ollydbg on linux.

Note the rip marker sliding into the code.

We can recognize the aray creations, and the s.index_after() function used to find substrings since a specific position.

If we take a look de dissasembly we sill see quite a few calls to tos3() functions.
Those functions are involved in string initialization, and implements safety checks.

tos(string, len)
tos2(byteptr)
tos3(charptr)

In this case I have a crash in my V code and I want to know what is crashing, just continue the execution with "dc" and see what poits the rip register.

In visual mode "V" we can see previous instructions to figure out the arguments and state.

We've located the crash on the substring operation which is something like "s2 := s1[a..b]" probably one of the arguments of the substring is out of bounds but luckily the V language has safety checks and is a controlled termination:

Switching the basic block view "space" we can see the execution flow, in this case we know the loops and branches because we have the code but this view also we can see the tos3 parameter "href=" which is useful to locate the position on the code.

When it reach the substr, we can see the parameters with "tab" command.

Looking the implementation the radare parameter calculation is quite exact.

Let's check the param values:

so the indexes are from 0x0e to 0x24 which are inside the buffer, lets continue to next iteration,
if we set a breakpoint and check every iteration, on latest iteration before the crash we have the values 0x2c to 0x70 with overflows the buffer and produces a controlled termination of the v compiled process.

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Bruno Souza

DEFINATION OF HACKING

Hacking is an attempt to exploit a computer system vulnerabilities or a private network inside a computer to gain unauthorized acess.
Hacking is identifying and exploiting weakness in computer system and/ or computer networks for finding the vulnerability and loopholes.

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Bruno Souza

An accountant and a security expert walk into a bar… SOC2 is no joke.

Whether you're a publicly held or private company, you are probably considering going through a Service Organization Controls (SOC) audit. For publicly held companies, these reports are required by the Securities and Exchange Commission (SEC) and executed by a Certified Public Accountant (CPA). However, customers often ask for SOC2 reports as part of their vendor due diligence process.

Out of the three types of SOC reports, SOC2 is the standard to successfully pass regulatory requirements and signals high security and resilience within the organization — and is based on the American Institute of Certified Public Accountants (AICPA) attestation requirements. The purpose of this report is to evaluate an organization's information systems relevant to security, availability, processing integrity, confidentiality, and privacy — over a period of time (roughly six to twelve months).

As part of a SOC2 audit, it is necessary to conduct security checks across the company's SaaS stack that will look for misconfigured settings such as detection and monitoring to ensure continued effectiveness of information security controls and prevent unauthorized/ inappropriate access to physical and digital assets and locations.

If you're beginning or on a SOC2 audit journey, then an SSPM (SaaS Security Posture Management) solution can streamline the process and shorten the time it takes to pass a SOC2 audit successfully, fully covering your SaaS Security posture.

Learn how to streamline your organization's SOC2 compliance

What are the AICPA Trust Services Criteria (TSC)?

When external auditors engage in a SOC 2 audit, they need to compare what you're doing to a long list of established requirements from AICPA TSC. The "Common Controls" fall into five groups:

Security - Includes sub controls of the Logical and Physical Access (CC6)
Availability - Includes sub controls of the System Operations (CC7)

Processing integrity: Includes sub controls of the System Operations (CC7)
Confidentiality: Includes sub controls of the Logical and Physical Access (CC6)
Privacy - Includes sub controls of the Monitoring Activities (CC4)

Within each common control are a set of sub controls that turn the overarching standard into actionable tasks.

Passing a SOC 2 audit takes a lot of time, effort, and documentation. During a SOC2 audit, you not only need to show that your controls work during the audit period, but you also need to show that you have the ability to continuously monitor your security.

Going through the entire TSC framework is too long for a blog post. However, a quick look into a couple of controls of Logical and Physical Access (CC6) and System Operations (CC7) gives you an idea of what some of the controls look like and how you can utilize an SSPM to ease the SOC2 audit.

Get a 15-minute demo of how an SSPM can help your SOC 2 TSC audit

Logical and Physical Access Controls

This section sets out the types of controls needed to prevent unauthorized or inappropriate access to physical and digital assets and locations. Managing user access permissions, authentication, and authorization across the SaaS estate poses many challenges. In fact, as you look to secure your cloud apps, the distributed nature of users and managing the different access policies becomes increasingly challenging.

Under CC6.1 control, entities need to:

Identify, classify, and manage information assets
Restrict & manage user access
Consider network segmentation
Register, authorize, and document new infrastructure
Supplement security by encrypting data-at-rest
Protect encryption keys

Example

The department that utilizes a SaaS app is often the one that purchases and implements it. Marketing might implement a SaaS solution for monitoring leads while sales implements the CRM. Meanwhile, each application has its own set of access capabilities and configurations. However, these SaaS owners may not be trained in security or able to continuously monitor the app's security settings so the security team loses visibility. At the same time, the security team may not know the inner workings of the SaaS like the owner so they may not understand more complex cases which could lead to a security breach.

An SSPM solution, maps out all the user permissions, encryption, certificates and all security configurations available for each SaaS app. In addition to the visibility, the SSPM solution helps correct any misconfiguration in these areas, taking into consideration each SaaS app's unique features and usability.

In CC.6.2 control, entities need to:

Create asset access credentiations based on authorization from the system's asset owner or authorized custodian
Establish processes for removing credential access when the user no longer requires access
Periodically review access for unnecessary and inappropriate individuals with credentials

Example

Permission drifts occur when a user has certain permissions as part of a group membership, but then gets assigned a specific permission that is more privileged than what the group has. Over time many users get extra permissions. This undermines the idea of provisioning using groups.

Classic deprovisioning issues, an SSPM solution can spot inactive users and help organizations to quickly remediate, or at the very least, alert the security team to the issue.

Under CC.6.3 control, entities need to:

Establish processes for creating, modifying or removing access to protected information and assets
Use role-based access controls (RBAC)
Periodically review access roles and access rules

Example

You might be managing 50,000 users across five SaaS applications, meaning the security team needs to manage a total of 250,000 identities. Meanwhile, each SaaS has a different way to define identities, view them, and secure identities. Adding to the risk, SaaS applications don't always integrate with each other which means users can find themselves with different privileges across different systems. This then leads to unnecessary privileges that can create a potential security risk.

An SSPM solution allows visibility into user privileges and sensitive permission across all connected SaaS apps, highlighting the deviation from permission groups and profiles.

System Operations

This section focuses on detection and monitoring to ensure continued effectiveness of information security controls across systems and networks, including SaaS apps. The diversity of SaaS apps and potential for misconfigurations makes meeting these requirements challenging.

In CC7.1 control, entities need to:

Define configuration standards
Monitor infrastructure and software for noncompliance with standards
Establish change-detection mechanisms to aler personnel to unauthorized modification for critical system, configuration, or content files
Establish procedures for detecting the introduction of known or unknown components
Conduct periodic vulnerability scans to detect potential vulnerabilities or misconfigurations

It is unrealistic to expect from the security team to define a "configuration standard" that complies with SOC2 without comparing against a built-in knowledge base of all relevant SaaS misconfigurations and to continuously comply with SOC2 without using an SSPM solution.

Get a 15-minute demo to see how an SSPM solution automates your SaaS security posture for SOC2 and other standards.

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domingo, 28 de janeiro de 2024

Hackerhubb.blogspot.com

Vlang Binary Debugging

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sábado, 27 de janeiro de 2024

DEFINATION OF HACKING

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How SSPM Simplifies Your SOC2 SaaS Security Posture Audit

What are the AICPA Trust Services Criteria (TSC)?

Logical and Physical Access Controls

Example

Example

Example

System Operations

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