3814 : Multiple Unix Vendor passwd Malformed ulimit /etc/passwd Manipulation
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Views This Week Views All Time Added to OSVDB Last Modified Modified (since 2008) Percent Complete
2 1999 about 10 years ago over 4 years ago 1 times 90%

Timeline

Disclosure Date
1989-01-31

Description

passwd contains an implementation flaw that may allow a local denial of service. The issue is triggered when the 'passwd' command is used in an environment with a very small ulimit value. If /etc/passwd is larger than the ulimit, use of the 'passwd' command will result in a truncated /etc/passwd file. If ulimit was set to 0 the /etc/passwd file will be empty, which will invalidate all password authentication attempts, and result in a loss of availability.

Classification

Location: Local Access Required
Attack Type: Authentication Management
Impact: Loss of Availability
Exploit: Exploit Public

Solution

Modern implementations of the 'passwd' utility perform adequate checks to avoid this vulnerabilitu. Refer to the vendor documentation for specific version numbers. An upgrade is required as there are no known workarounds.

Products

Multiple
Unix
System V

References

Credit

Unknown or Incomplete

CVSSv2 Score

NVD does not currently have a CVSSv2 score assigned.

Comments

No Comments.

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