SB2011012502 - Input validation error in Xen
Published: January 25, 2011 Updated: August 11, 2020
Security Bulletin ID
SB2011012502
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Adjecent network
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Input validation error (CVE-ID: CVE-2010-4255)
The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.
The fixup_page_fault function in arch/x86/traps.c in Xen 4.0.1 and earlier on 64-bit platforms, when paravirtualization is enabled, does not verify that kernel mode is used to call the handle_gdt_ldt_mapping_fault function, which allows guest OS users to cause a denial of service (host OS BUG_ON) via a crafted memory access.
Remediation
Install update from vendor's website.
References
- http://lists.xensource.com/archives/html/xen-devel/2010-11/msg01650.html
- http://openwall.com/lists/oss-security/2010/11/30/5
- http://openwall.com/lists/oss-security/2010/11/30/8
- http://secunia.com/advisories/42884
- http://secunia.com/advisories/46397
- http://www.redhat.com/support/errata/RHSA-2011-0017.html
- http://www.securityfocus.com/archive/1/520102/100/0/threaded
- http://www.vmware.com/security/advisories/VMSA-2011-0012.html
- https://bugzilla.redhat.com/show_bug.cgi?id=658155