Red Hat Security Advisory: kernel 2.2 and 2.4
Syncookies are used to protect a system against certain Denial Of Service (DOS) attacks. A flaw in this mechanism has been found which can be used to circumvent certain types of firewall configurations. Note: syncookies are not enabled in the default installation of Red Hat Linux but many server administrators do enable syncookies.
describes (2)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2001-0851US | medium5.0 | — | ||
Linux kernel 2.0, 2.2 and 2.4 with syncookies enabled allows remote attackers to bypass firewall rules by brute force guessing the cookie. | ||||
| CVE-2001-0852US | medium5.0 | Exploit | ||
TUX HTTP server 2.1.0-2 in Red Hat Linux allows remote attackers to cause a denial of service via a long Host: header. | ||||
references
External citations — patches, advisories, analysis.
- http://cr.yp.to/syncookies.htmlexternal
- https://access.redhat.com/errata/RHSA-2001:142self
- https://access.redhat.com/security/updates/classification/#importantexternal
- 54829external
- 54851external
- 54868external
- 55067external
- 55082external
remediations (8)
- FixedRed Hat Linux 6.2
Before applying this update, make sure all previously released errata relevant to your system have been applied. The procedure for upgrading the kernel is documented at: http://www.redhat.com/support/docs/howto/kernel-upgrade/ Please read the directions for your architecture carefully before proceeding with the kernel upgrade. Please note that this update is also available via Red Hat Network. Many people find this to be an easier way to apply updates. To use Red Hat Network, launch the Red Hat Update Agent with the following command: up2date This will start an interactive process that will result in the appropriate RPMs being upgraded on your system. Note that you need to select the kernel explicitly on default configurations of up2date.
https://access.redhat.com/errata/RHSA-2001:142 - FixedRed Hat Linux 6.2
Before applying this update, make sure all previously released errata relevant to your system have been applied. The procedure for upgrading the kernel is documented at: http://www.redhat.com/support/docs/howto/kernel-upgrade/ Please read the directions for your architecture carefully before proceeding with the kernel upgrade. Please note that this update is also available via Red Hat Network. Many people find this to be an easier way to apply updates. To use Red Hat Network, launch the Red Hat Update Agent with the following command: up2date This will start an interactive process that will result in the appropriate RPMs being upgraded on your system. Note that you need to select the kernel explicitly on default configurations of up2date.
https://access.redhat.com/errata/RHSA-2001:142 - FixedRed Hat Linux 7.0
Before applying this update, make sure all previously released errata relevant to your system have been applied. The procedure for upgrading the kernel is documented at: http://www.redhat.com/support/docs/howto/kernel-upgrade/ Please read the directions for your architecture carefully before proceeding with the kernel upgrade. Please note that this update is also available via Red Hat Network. Many people find this to be an easier way to apply updates. To use Red Hat Network, launch the Red Hat Update Agent with the following command: up2date This will start an interactive process that will result in the appropriate RPMs being upgraded on your system. Note that you need to select the kernel explicitly on default configurations of up2date.
https://access.redhat.com/errata/RHSA-2001:142 - FixedRed Hat Linux 7.0
Before applying this update, make sure all previously released errata relevant to your system have been applied. The procedure for upgrading the kernel is documented at: http://www.redhat.com/support/docs/howto/kernel-upgrade/ Please read the directions for your architecture carefully before proceeding with the kernel upgrade. Please note that this update is also available via Red Hat Network. Many people find this to be an easier way to apply updates. To use Red Hat Network, launch the Red Hat Update Agent with the following command: up2date This will start an interactive process that will result in the appropriate RPMs being upgraded on your system. Note that you need to select the kernel explicitly on default configurations of up2date.
https://access.redhat.com/errata/RHSA-2001:142 - FixedRed Hat Linux 7.1
Before applying this update, make sure all previously released errata relevant to your system have been applied. The procedure for upgrading the kernel is documented at: http://www.redhat.com/support/docs/howto/kernel-upgrade/ Please read the directions for your architecture carefully before proceeding with the kernel upgrade. Please note that this update is also available via Red Hat Network. Many people find this to be an easier way to apply updates. To use Red Hat Network, launch the Red Hat Update Agent with the following command: up2date This will start an interactive process that will result in the appropriate RPMs being upgraded on your system. Note that you need to select the kernel explicitly on default configurations of up2date.
https://access.redhat.com/errata/RHSA-2001:142 - FixedRed Hat Linux 7.1
Before applying this update, make sure all previously released errata relevant to your system have been applied. The procedure for upgrading the kernel is documented at: http://www.redhat.com/support/docs/howto/kernel-upgrade/ Please read the directions for your architecture carefully before proceeding with the kernel upgrade. Please note that this update is also available via Red Hat Network. Many people find this to be an easier way to apply updates. To use Red Hat Network, launch the Red Hat Update Agent with the following command: up2date This will start an interactive process that will result in the appropriate RPMs being upgraded on your system. Note that you need to select the kernel explicitly on default configurations of up2date.
https://access.redhat.com/errata/RHSA-2001:142 - FixedRed Hat Linux 7.2
Before applying this update, make sure all previously released errata relevant to your system have been applied. The procedure for upgrading the kernel is documented at: http://www.redhat.com/support/docs/howto/kernel-upgrade/ Please read the directions for your architecture carefully before proceeding with the kernel upgrade. Please note that this update is also available via Red Hat Network. Many people find this to be an easier way to apply updates. To use Red Hat Network, launch the Red Hat Update Agent with the following command: up2date This will start an interactive process that will result in the appropriate RPMs being upgraded on your system. Note that you need to select the kernel explicitly on default configurations of up2date.
https://access.redhat.com/errata/RHSA-2001:142 - FixedRed Hat Linux 7.2
Before applying this update, make sure all previously released errata relevant to your system have been applied. The procedure for upgrading the kernel is documented at: http://www.redhat.com/support/docs/howto/kernel-upgrade/ Please read the directions for your architecture carefully before proceeding with the kernel upgrade. Please note that this update is also available via Red Hat Network. Many people find this to be an easier way to apply updates. To use Red Hat Network, launch the Red Hat Update Agent with the following command: up2date This will start an interactive process that will result in the appropriate RPMs being upgraded on your system. Note that you need to select the kernel explicitly on default configurations of up2date.
https://access.redhat.com/errata/RHSA-2001:142
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