CVE-1999-1021

Summary

CVE-1999-1021 is a vulnerability affecting the Network File System (NFS) on SunOS 4.1 through 4.1.2. The issue arises due to the NFS server's failure to consider the high order 16 bits in a 32-bit User ID (UID). This allows local users to manipulate their UID by setting the lower 16 bits to zero. If successfully exploited, this vulnerability grants the attacker root access, making it a significant security risk. This issue has been addressed through the application of the NFS jumbo patch upgrade.

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