setpwnam.c in the util-linux package, as included in Red Hat Linux 7.3
and earlier, and other operating systems, does not properly lock a
temporary file when modifying /etc/passwd, which may allow local users
to gain privileges via a complex race condition that uses an open file
descriptor in utility programs such as chfn and chsh.
Note:References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
VULNWATCH:20020729 [VulnWatch] RAZOR advisory: Linux util-linux chfn local root vulnerability
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