Denial of Service in GNU Tar Due to File Shrinkage Mismanagement

CVE-2018-20482

What is CVE-2018-20482?

A flaw in GNU Tar versions up to 1.30 can cause a denial of service when the '--sparse' option is employed. This vulnerability occurs due to improper handling of file shrinkage during read operations. If a file, intended for archiving by another user (such as during a system backup executed as root), is modified, it may lead to an infinite read loop. This issue allows local users to disrupt processes that rely on the integrity of the archived data, making it critical for systems using GNU Tar to implement appropriate fixes.

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References