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FreeBSD "nfsd" NFS Mount Request Denial of Service
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Secunia Advisory:
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SA19017
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Release Date:
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2006-02-27
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Last Update:
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2006-03-02
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Popularity:
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10,468 views
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Critical:
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Less critical
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Impact:
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DoS
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Where:
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From local network
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Solution Status:
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Vendor Patch
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| OS: | FreeBSD 4.x
FreeBSD 5.x
FreeBSD 6.x
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Subscribe:
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Instant alerts on relevant vulnerabilities 
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| | CVE reference: | CVE-2006-0900
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Description:
Evgeny Legerov has reported a vulnerability in FreeBSD, which can be exploited by malicious people to cause a DoS (Denial of Service).
The vulnerability is caused due to a NULL pointer dereference error within the handling of NFS mount requests. This can be exploited to cause a kernel panic via a request with a zero-length payload sent to the "nfsd" daemon on port 2049/tcp.
Solution:
Update FreeBSD or apply patch.
Fixed versions:
2006-03-01 14:18:11 UTC (RELENG_6, 6.1-PRERELEASE)
2006-03-01 14:18:46 UTC (RELENG_6_0, 6.0-RELEASE-p5)
2006-03-01 14:19:48 UTC (RELENG_5, 5.5-PRERELEASE)
2006-03-01 14:21:01 UTC (RELENG_5_4, 5.4-RELEASE-p12)
2006-03-01 14:24:52 UTC (RELENG_5_3, 5.3-RELEASE-p27)
2006-03-01 14:21:56 UTC (RELENG_4, 4.11-STABLE)
2006-03-01 14:22:30 UTC (RELENG_4_11, 4.11-RELEASE-p15)
2006-03-01 14:23:07 UTC (RELENG_4_10, 4.10-RELEASE-p21)
Patch for FreeBSD 4.10 and 4.11:
ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-06:10/nfs4.patch
ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-06:10/nfs4.patch.asc
Patch for FreeBSD 5.3, 5.4, and 6.0:
ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-06:10/nfs.patch
ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-06:10/nfs.patch.asc
Provided and/or discovered by:
Evgeny Legerov
Changelog:
2006-03-02: Updated "Solution" section. Added CVE reference. Added additional affected versions.
Original Advisory:
FreeBSD:
ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-06:10.nfs.asc
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About this Secunia Advisory
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.
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