CWE-560 상세 정보

The product calls umask() with an incorrect argument that is specified as if it is an argument to chmod().

취약점 도입 방식

Implementation

적용 가능한 플랫폼

언어

이름: C (Undetermined)

일반적인 결과

잠재적 완화 방법

Phases : Implementation
Use umask() with the correct argument.

탐지 방법

Automated Static Analysis

If you suspect misuse of umask(), you can use grep to spot call instances of umask().

취약점 매핑 메모

근거 : This CWE entry is at the Variant level of abstraction, which is a preferred level of abstraction for mapping to the root causes of vulnerabilities.
댓글 : Carefully read both the name and description to ensure that this mapping is an appropriate fit. Do not try to 'force' a mapping to a lower-level Base/Variant simply to comply with this preferred level of abstraction.

메모

Some umask() manual pages begin with the false statement: "umask sets the umask to mask & 0777" Although this behavior would better align with the usage of chmod(), where the user provided argument specifies the bits to enable on the specified file, the behavior of umask() is in fact opposite: umask() sets the umask to ~mask & 0777. The documentation goes on to describe the correct usage of umask(): "The umask is used by open() to set initial file permissions on a newly-created file. Specifically, permissions in the umask are turned off from the mode argument to open(2) (so, for example, the common umask default value of 022 results in new files being created with permissions 0666 & ~022 = 0644 = rw-r--r-- in the usual case where the mode is specified as 0666)."

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