External risk intelligence

Libdwarf Negation Overflow Vulnerability Affects Data Integrity.

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2016-9558

A flaw in the libdwarf library can allow attackers to cause unspecified impact via crafted data, potentially compromising systems and data. Business risk includes unauthorized access and data integrity loss.

1Halo Surface Signal

Integer Overflow

Libdwarf Project Libdwarf

1999-12-14 to before 2016-11-24

External exposure likelihood

Halo Surface Signal score for CVE-2016-9558

libdwarf is a library used by developers for processing DWARF debugging information. It is typically utilized in build-time tools, debuggers, or static analysis software rather than as a network-facing service or edge component. It lacks the network interface or deployment pattern required for public internet exposure.

Horizon Alert

Summary of the vulnerability and why it matters

The libdwarf library contains a flaw that could allow for security vulnerabilities. This weakness is related to how it handles specific data patterns within signed numbers. If exploited, this could potentially lead to various negative consequences for affected systems and data.

  • Vulnerable component: libdwarf library
  • Core weakness: Negation overflow in signed number handling
  • Main business impact: Unspecified system compromise

Attack Path

How an attacker could exploit the issue

This vulnerability allows for remote attackers to cause an unspecified impact by sending a specially crafted bit pattern within a signed leb number to a vulnerable application. The malformed input can lead to a negation overflow condition. This could allow an attacker to gain unauthorized control over affected systems or data.

  • Network exposure required.
  • Attacker sends crafted input.
  • Unspecified impact achieved.

Live Threat

Current exploitation, exposure, and threat context

The described vulnerability presents a critical threat due to its ease of exploitation and potential for significant damage. Attackers with no prior access or specific conditions can remotely trigger this vulnerability. This could lead to severe business disruption, including data compromise and system integrity loss. Given the critical severity and remote exploitability, organizations should treat this vulnerability with urgency.

  • Likely attacker skill level: Low.
  • Required access or conditions: None.
  • Business risk or urgency: High.

Priority actions

Operational Fix

Recommended remediation, mitigation, and detection steps

An organization should address this vulnerability to mitigate potential risks. The issue involves a flaw in how signed leb numbers are processed, which could allow for an unspecified impact if exploited via a crafted bit pattern. Organizations should prioritize understanding their exposure and implementing protective measures to safeguard systems and data.

  • Identify systems using the affected library.
  • Restrict network access to vulnerable services.
  • Apply vendor updates and confirm the fix.
  • Monitor for related security events.

Frequently asked questions

What is libdwarf and what is its purpose in software development?

Libdwarf is a software library designed to help developers work with DWARF debugging information. This information is essential for understanding and debugging compiled code, making it a valuable component in tools such as debuggers and static analysis software.

What type of vulnerability does CVE-2016-9558 represent, and what is the weakness class?

CVE-2016-9558 is a negation overflow vulnerability found in the libdwarf library. The weakness class identified is CWE-190, which relates to integer overflow issues.

How can an attacker exploit the negation overflow in libdwarf?

An attacker can trigger this vulnerability by sending a specially crafted bit pattern within a signed leb number to a vulnerable application. This can lead to a negation overflow condition, potentially resulting in unspecified impacts.

What is the overall relevance of CVE-2016-9558 given its technical details?

This vulnerability poses a critical threat due to its remote exploitability and potential for significant system compromise. Attackers can leverage a crafted bit pattern in a signed leb number to cause a negation overflow, impacting system integrity and data. The Halo Surface Signal indicates a 'Very unlikely' exposure, as libdwarf is typically used in build-time tools and lacks network-facing interfaces.

What practical steps should an organization take to address CVE-2016-9558?

Organizations should identify systems utilizing the affected libdwarf library versions. Applying vendor-released updates is a primary mitigation. Additionally, monitoring for related security events and restricting network access to vulnerable services can help safeguard systems and data from potential exploitation.

References