CVE-2011-1739: Input Validation
First published: Tue May 03 2011(Updated: )
The makemask function in mountd.c in mountd in FreeBSD 7.4 through 8.2 does not properly handle a -network field specifying a CIDR block with a prefix length that is not an integer multiple of 8, which allows remote attackers to bypass intended access restrictions in opportunistic circumstances via an NFS mount request.
Credit: secteam@freebsd.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| FreeBSD Kernel | =7.4 | |
| FreeBSD Kernel | =8.2 | |
| FreeBSD Kernel | =8.0 | |
| FreeBSD Kernel | =8.1 |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2011-1739?
CVE-2011-1739 is considered a medium severity vulnerability that allows remote attackers to bypass access restrictions.
How do I fix CVE-2011-1739?
To fix CVE-2011-1739, update FreeBSD to versions 7.4, 8.0, 8.1, or 8.2 that include the patch for the mountd service.
What systems are affected by CVE-2011-1739?
CVE-2011-1739 affects FreeBSD versions 7.4, 8.0, 8.1, and 8.2.
What can exploit CVE-2011-1739?
CVE-2011-1739 can be exploited by remote attackers who can craft specific CIDR block requests to bypass access controls.
What type of vulnerability is CVE-2011-1739?
CVE-2011-1739 is a bypass vulnerability that affects the access restrictions of the mountd service in FreeBSD.
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