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Info |
Last Modified |
| 6 months ago |
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Description |
BSD contains a flaw that may allow a local denial of service. The issue is triggered when a malicious user limits filesizes to 1k before using passwd. The passwd program will copy the first 1k of data from /etc/passwd into the lock file /etc/ptmp. Once 1k of data is copied, passwd will die and the lock file will remain, resulting in a loss of availability for changing passwords.
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Classification |
Location:
Local Access Required
Attack Type:
Denial of Service
Impact:
Loss of Availability
Exploit:
Exploit Available
Disclosure:
OSVDB Verified
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Solution |
Currently, there are no known upgrades or patches to correct this issue. It is possible to correct the flaw by implementing the following workaround: copy the code from chsh or chfn that sets the CPU time and filesize limits to infinity and recompile the passwd binary.
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Products |
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BSD
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4.2 |
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BlogsProvided by Technorati
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None found at this time
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