Linux Kernel routing implementation cache denial of service

linux-kernel-routing-dos (55808) The risk level is classified as MediumMedium Risk

Description:

The Linux Kernel is vulnerable to a denial of service, caused by errors in the routing implementation. By sending multiple specially-crafted packets, a remote attacker could trigger the emergency route flush process, causing a deadlock or alternately, cause a route look-up to trigger an uninitialized pointer, which would cause the kernel to panic.

*CVSS:

Base Score: 7.8
  Access Vector: Network
  Access Complexity: Low
  Authentication: None
  Confidentiality Impact: None
  Integrity Impact: None
  Availability Impact: Complete
 
Temporal Score: 5.8
  Exploitability: Unproven
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Denial of Service

Remedy:

Refer to RHSA-2010:0046-1 for patch, upgrade or suggested workaround information. See References.

For other distributions:
Apply the appropriate update for your system. See References.

References:

  • Red Hat Bugzilla Bug 545411: CVE-2009-4272 kernel: emergency route cache flushing leads to node deadlock.
  • VMSA-2010-0009: ESXi utilities and ESX Service Console third party updates.
  • BID-37875: Red Hat Linux Kernel Routing Implementation Multiple Remote Denial of Service Vulnerabilities
  • CVE-2009-4272: A certain Red Hat patch for net/ipv4/route.c in the Linux kernel 2.6.18 on Red Hat Enterprise Linux (RHEL) 5 allows remote attackers to cause a denial of service (deadlock) via crafted packets that force collisions in the IPv4 routing hash table, and trigger a routing emergency in which a hash chain is too long. NOTE: this is related to an issue in the Linux kernel before 2.6.31, when the kernel routing cache is disabled, involving an uninitialized pointer and a panic.
  • RHSA-2010-0046: Important: kernel security and bug fix update
  • RHSA-2010-0095: Important: rhev-hypervisor security and bug fix update
  • SA39920: VMware vMA kernel Multiple Vulnerabilities
  • SA39972: VMware ESXi ntp Mode 7 Request Denial of Service
  • SA39973: VMware ESX Multiple krb5 Vulnerabilities
  • SA39974: VMware ESX GCC libtool Search Path Privilege Escalation Security Issue
  • SA39975: VMware ESX gzip unlzw() Integer Underflow Vulnerability
  • SA39976: VMware vMA OpenSSL CRYPTO_free_all_ex_data() Memory Leak Vulnerability
  • SA39977: VMware vMA Multiple krb5 Vulnerabilities
  • SA39979: VMware vMA GCC libtool Search Path Privilege Escalation Security Issue
  • SA39980: VMware vMA gzip unlzw() Integer Underflow Vulnerability
  • SA39981: VMware vMA sudo Privilege Escalation Security Issues

Platforms Affected:

  • RedHat Enterprise Linux 5
  • RedHat Enterprise Linux 5 Server
  • RedHat Enterprise Linux 5 Client
  • RedHat Enterprise Linux 5.4.z EUS
  • VMware ESX Server 4.0
  • VMware ESXi Server 4.0

Reported:

Jan 21, 2010

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