CVE-2000-1219 in gcc
Summary
by MITRE
The -ftrapv compiler option in gcc and g++ 3.3.3 and earlier does not handle all types of integer overflows, which may leave applications vulnerable to vulnerabilities related to overflows.
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Analysis
by VulDB Data Team • 06/09/2024
The vulnerability described in CVE-2000-1219 represents a critical flaw in the gcc and g++ compiler versions 3.3.3 and earlier regarding their handling of integer overflow conditions through the -ftrapv compiler option. This issue stems from the compiler's incomplete implementation of overflow detection mechanisms that should theoretically trigger traps when integer arithmetic operations exceed their representable ranges. The -ftrapv option was designed to aid in identifying potential integer overflow vulnerabilities during compilation by inserting trap instructions that would activate upon overflow conditions. However, the implementation in these older compiler versions contained gaps that allowed certain types of integer overflows to go undetected, creating a false sense of security for developers who relied on this protection mechanism. This flaw specifically affects the compiler's ability to generate proper overflow detection code, leaving applications compiled with this option vulnerable to exploitation through integer overflow attacks that could lead to unexpected program behavior or security breaches.
The technical root cause of this vulnerability lies in the incomplete implementation of the integer overflow detection logic within the compiler's code generation phase. When developers used the -ftrapv flag, the compiler was expected to insert runtime checks that would detect overflow conditions and trigger appropriate trap handlers. However, the compiler failed to account for all possible overflow scenarios, particularly those involving specific combinations of signed and unsigned integer operations, bit shifting operations, and arithmetic operations that could result in undefined behavior according to the c standard. This incomplete coverage means that while some overflow conditions were properly detected and trapped, others could silently proceed, potentially leading to exploitable conditions where attackers could manipulate integer values to trigger unexpected program states. The vulnerability essentially creates a gap in the compiler's defensive mechanisms, allowing certain overflow conditions to bypass the intended protection.
The operational impact of CVE-2000-1219 extends beyond simple compilation issues to represent a significant security risk for applications that rely on the -ftrapv option for overflow detection. Applications compiled with affected compiler versions may exhibit unexpected behavior when encountering integer overflows, potentially leading to denial of service conditions, data corruption, or in worst-case scenarios, arbitrary code execution. The vulnerability is particularly concerning because it affects widely used compiler versions that were prevalent during the early 2000s, meaning numerous applications and systems could be vulnerable if they relied on this compiler option for security purposes. Attackers could exploit this weakness by crafting inputs that would cause integer overflows in applications compiled with the affected compiler, potentially leading to privilege escalation or other malicious outcomes. The vulnerability also impacts the effectiveness of security testing and code analysis processes that depend on compiler-based overflow detection mechanisms, as the protection provided by -ftrapv may be unreliable.
The mitigation strategies for this vulnerability primarily involve upgrading to compiler versions that properly implement the -ftrapv option or abandoning reliance on this specific compiler protection mechanism. System administrators and developers should upgrade to gcc and g++ versions that have addressed this flaw, typically those released after the vulnerability was identified in 2000. Alternative approaches include implementing additional runtime checks and validation mechanisms within applications to compensate for the incomplete compiler protection. Code review practices should be enhanced to manually identify and address potential integer overflow conditions, particularly in areas involving arithmetic operations, array indexing, and buffer manipulations. The vulnerability aligns with CWE-191, which specifically addresses integer underflow and overflow conditions, and relates to ATT&CK technique T1059.001 for command and scripting interpreter usage in exploitation contexts. Organizations should also consider implementing comprehensive security testing procedures that include static and dynamic analysis tools to identify integer overflow vulnerabilities that may not be caught by compiler-based mechanisms alone.