shadow-utils /etc/default Temp File Race Condition Vulnerability

BID:2196

Info

shadow-utils /etc/default Temp File Race Condition Vulnerability

Bugtraq ID: 2196
Class: Race Condition Error
CVE:
Remote: No
Local: Yes
Published: Jan 10 2001 12:00AM
Updated: Jan 10 2001 12:00AM
Credit: This vulnerability was first announced by Greg KH <[email protected]> on January 10, 2001 via Bugtraq.
Vulnerable: Wirex Immunix OS 7.0 -Beta
Redhat Linux 7.0
Mandriva Linux Mandrake 7.2
Mandriva Linux Mandrake 7.1
Mandriva Linux Mandrake 7.0
Mandriva Linux Mandrake 6.1
Mandriva Linux Mandrake 6.0
Not Vulnerable:

Discussion

shadow-utils /etc/default Temp File Race Condition Vulnerability

shadow-utils is a freely available, open source software package available with most distributions of the Linux Operating System. shadow-utils provides a higher level of security to systems by providing stronger cryptography and secure account management tools.

A problem in the package could create the opportunity for a symbolic link attack. During execution of the passwd program, temporary files are created in the /etc/default directory. The files created in this directory use predictable filenames. In the event of the /etc/default directory being world writable, it is possible to create a range of symbolic links to files owned by another user that could overwrite or append to files that are write-accessible by the UID of the passwd process. This could make it possible for a user with malicious motives to overwrite or append to and corrupt files writable by the UID of the passwd process.

Exploit / POC

shadow-utils /etc/default Temp File Race Condition Vulnerability

Currently the SecurityFocus staff are not aware of any exploits for this issue. If you feel we are in error or are aware of more recent information, please mail us at: [email protected].

Solution / Fix

shadow-utils /etc/default Temp File Race Condition Vulnerability

Solution:
Upgrades available:


Mandriva Linux Mandrake 6.0

Mandriva Linux Mandrake 6.1

Mandriva Linux Mandrake 7.0

Wirex Immunix OS 7.0 -Beta

Mandriva Linux Mandrake 7.1

Mandriva Linux Mandrake 7.2

References

shadow-utils /etc/default Temp File Race Condition Vulnerability

References:
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