Linux Kernel ISO9660 File System Component Buffer Overflow Vulnerability

    Date15 Apr 2004
    4145
    Posted ByAnthony Pell
    Symbolic links on ISO9660 file systems are supported by the 'Rock Ridge' extension to the standard format. The vulnerability can be triggered by performing a directory listing on a maliciously constructed ISO file system, or attempting to access a file via a malformed symlink on such a file system. Many distributions allow local users to mount CDs, which makes them potentially vulnerable to local elevation attacks. . . . The Linux kernel performs no length checking on symbolic links stored on an ISO9660 file system, allowing a malformed CD to perform an arbitrary length overflow in kernel memory.

    Symbolic links on ISO9660 file systems are supported by the 'Rock Ridge' extension to the standard format. The vulnerability can be triggered by performing a directory listing on a maliciously constructed ISO file system, or attempting to access a file via a malformed symlink on such a file system. Many distributions allow local users to mount CDs, which makes them potentially vulnerable to local elevation attacks.

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