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Info |
Last Modified |
| 8 months ago |
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Description |
FreeBSD contains a flaw that may allow a malicious user to gain access to unauthorized privileges. The issue is triggered when the kernel follows a maliciously created symbolic link during its creation of core files using periodic(3), allowing arbitrary file modification. This flaw may lead to a loss of integrity.
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Classification |
Location:
Local Access Required
Attack Type:
Race Condition
Impact:
Loss of Integrity
Exploit:
Exploit Rumored / Private
Disclosure:
OSVDB Verified
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Solution |
Upgrade to corrected versions 3.2-STABLE or 3.3-RELEASE or higher, as it has been reported to fix this vulnerability. Also, FreeBSD has released a patch. It is also possible to correct the flaw by implementing the following workaround: disable periodic() core dumps by changing core size to zero.
# mv /usr/sbin/periodic /usr/sbin/periodic.bin
# cat > /usr/sbin/periodic
#!/bin/sh
ulimit -c 0
/usr/sbin/periodic.bin $*
^D
# chmod 555 /usr/sbin/periodic
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Products |
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FreeBSD
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1.1.5.1 |
2.x |
3.0 |
3.1 |
3.2 |
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Credit |
Unknown or Incomplete
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BlogsProvided by Technorati
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None found at this time
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