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C

C static code analysis

Unique rules to find Bugs, Vulnerabilities, Security Hotspots, and Code Smells in your C code

  • All rules 315
  • Vulnerability13
  • Bug76
  • Security Hotspot19
  • Code Smell207

  • Quick Fix 19
Filtered: 35 rules found
symbolic-execution
    Impact
      Clean code attribute
        1. The address of an automatic object should not be assigned to another object that may persist after the first object has ceased to exist

           Bug
        2. Variables should be initialized before use

           Bug
        3. Variables should not be accessed outside of their scope

           Bug
        4. Account validity should be verified when authenticating users with PAM

           Vulnerability
        5. Changing directories improperly when using "chroot" is security-sensitive

           Security Hotspot
        6. POSIX functions should not be called with arguments that trigger buffer overflows

           Vulnerability
        7. Server hostnames should be verified during SSL/TLS connections

           Vulnerability
        8. "pthread_mutex_t" should be unlocked in the reverse order they were locked

           Bug
        9. Only valid arguments should be passed to UNIX/POSIX functions

           Code Smell
        10. "pthread_mutex_t" should be properly initialized and destroyed

           Bug
        11. "pthread_mutex_t" should not be locked when already locked, or unlocked when already unlocked

           Bug
        12. Only valid arguments should be passed to stream functions

           Code Smell
        13. Using publicly writable directories is security-sensitive

           Security Hotspot
        14. Using clear-text protocols is security-sensitive

           Security Hotspot
        15. Blocking functions should not be called inside critical sections

           Code Smell
        16. Return value of "setuid" family of functions should always be checked

           Code Smell
        17. Size of variable length arrays should be greater than zero

           Code Smell
        18. "mktemp" family of functions templates should have at least six trailing "X"s

           Code Smell
        19. Appropriate size arguments should be passed to "strncat" and "strlcpy"

           Code Smell
        20. Server certificates should be verified during SSL/TLS connections

           Vulnerability
        21. Weak SSL/TLS protocols should not be used

           Vulnerability
        22. Integral operations should not overflow

           Bug
        23. Parameter values should be appropriate

           Bug
        24. Stack allocated memory and non-owned memory should not be freed

           Bug
        25. Closed resources should not be accessed

           Bug
        26. Dynamically allocated memory should be released

           Bug
        27. Freed memory should not be used

           Bug
        28. Memory locations should not be released more than once

           Bug
        29. Memory access should be explicitly bounded to prevent buffer overflows

           Bug
        30. Zero should not be a possible denominator

           Bug
        31. XML parsers should not be vulnerable to XXE attacks

           Vulnerability
        32. "nonnull" parameters and return values of "returns_nonnull" functions should not be null

           Bug
        33. Null pointers should not be dereferenced

           Bug
        34. Resources should be closed

           Bug
        35. Unused assignments should be removed

           Code Smell

        Weak SSL/TLS protocols should not be used

        responsibility - trustworthy
        security
        Vulnerability
        • cwe
        • symbolic-execution
        • privacy

        This vulnerability exposes encrypted data to a number of attacks whose goal is to recover the plaintext.

        Why is this an issue?

        How can I fix it?

        More Info

        Encryption algorithms are essential for protecting sensitive information and ensuring secure communications in a variety of domains. They are used for several important reasons:

        • Confidentiality, privacy, and intellectual property protection
        • Security during transmission or on storage devices
        • Data integrity, general trust, and authentication

        When selecting encryption algorithms, tools, or combinations, you should also consider two things:

        1. No encryption is unbreakable.
        2. The strength of an encryption algorithm is usually measured by the effort required to crack it within a reasonable time frame.

        For these reasons, as soon as cryptography is included in a project, it is important to choose encryption algorithms that are considered strong and secure by the cryptography community.

        To provide communication security over a network, SSL and TLS are generally used. However, it is important to note that the following protocols are all considered weak by the cryptographic community, and are officially deprecated:

        • SSL versions 1.0, 2.0 and 3.0
        • TLS versions 1.0 and 1.1

        When these unsecured protocols are used, it is best practice to expect a breach: that a user or organization with malicious intent will perform mathematical attacks on this data after obtaining it by other means.

        What is the potential impact?

        After retrieving encrypted data and performing cryptographic attacks on it on a given timeframe, attackers can recover the plaintext that encryption was supposed to protect.

        Depending on the recovered data, the impact may vary.

        Below are some real-world scenarios that illustrate the potential impact of an attacker exploiting the vulnerability.

        Additional attack surface

        By modifying the plaintext of the encrypted message, an attacker may be able to trigger additional vulnerabilities in the code. An attacker can further exploit a system to obtain more information.
        Encrypted values are often considered trustworthy because it would not be possible for a third party to modify them under normal circumstances.

        Breach of confidentiality and privacy

        When encrypted data contains personal or sensitive information, its retrieval by an attacker can lead to privacy violations, identity theft, financial loss, reputational damage, or unauthorized access to confidential systems.

        In this scenario, the company, its employees, users, and partners could be seriously affected.

        The impact is twofold, as data breaches and exposure of encrypted data can undermine trust in the organization, as customers, clients and stakeholders may lose confidence in the organization’s ability to protect their sensitive data.

        Legal and compliance issues

        In many industries and locations, there are legal and compliance requirements to protect sensitive data. If encrypted data is compromised and the plaintext can be recovered, companies face legal consequences, penalties, or violations of privacy laws.

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          Developer Edition
          Available Since
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