VulnerabilityModified
CVE-2019-11479
Jonathan Looney discovered that the Linux kernel default MSS is hard-coded to 48 bytes.
HIGH 7.5EPSS 91.7%
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 91.7%, higher than 100% of all known CVEs. Patch or mitigate before the next change window.
Description
Jonathan Looney discovered that the Linux kernel default MSS is hard-coded to 48 bytes. This allows a remote peer to fragment TCP resend queues significantly more than if a larger MSS were enforced. A remote attacker could use this to cause a denial of service. This has been fixed in stable kernel releases 4.4.182, 4.9.182, 4.14.127, 4.19.52, 5.1.11, and is fixed in commits 967c05aee439e6e5d7d805e195b3a20ef5c433d6 and 5f3e2bf008c2221478101ee72f5cb4654b9fc363.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 91.66% probability · 100th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-405, CWE-770
- Affected
- linux/linux kernel · f5/big-ip advanced firewall manager · f5/big-ip access policy manager · f5/big-ip application acceleration manager · f5/big-ip link controller · f5/big-ip policy enforcement manager · f5/big-ip webaccelerator · f5/big-ip application security manager · f5/big-ip local traffic manager · f5/big-ip fraud protection service · f5/big-ip global traffic manager · f5/big-ip analytics · f5/big-ip edge gateway · f5/big-ip domain name system · canonical/ubuntu linux · redhat/enterprise linux · f5/big-iq centralized management · f5/enterprise manager · f5/iworkflow · f5/traffix signaling delivery controller · +1 more
- Source
- security@ubuntu.com
References
- http://www.arubanetworks.com/assets/alert/ARUBA-PSA-2020-010.txtThird Party Advisory
- http://www.openwall.com/lists/oss-security/2019/06/28/2Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2019/07/06/3Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2019/07/06/4Mailing List, Third Party Advisory
- http://www.securityfocus.com/bid/108818Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2019:1594Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:1602Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:1699Third Party Advisory
- https://access.redhat.com/security/vulnerabilities/tcpsackThird Party Advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-462066.pdfThird Party Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=5f3e2bf008c2221478101ee72f5cb4654b9fc363Mailing List, Patch, Vendor Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=967c05aee439e6e5d7d805e195b3a20ef5c433d6Mailing List, Patch, Vendor Advisory
- https://github.com/Netflix/security-bulletins/blob/master/advisories/third-party/2019-001.mdPatch, Third Party Advisory
- https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44193Third Party Advisory
- https://kc.mcafee.com/corporate/index?page=content&id=SB10287Third Party Advisory
- https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2019-0008Third Party Advisory
- https://security.netapp.com/advisory/ntap-20190625-0001/Third Party Advisory
- https://support.f5.com/csp/article/K35421172Third Party Advisory
- https://support.f5.com/csp/article/K35421172?utm_source=f5support&%3Butm_medium=RSS
- https://usn.ubuntu.com/4041-1/Third Party Advisory
- https://usn.ubuntu.com/4041-2/Third Party Advisory
- https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/SACKPanicMitigation, Third Party Advisory
- https://www.kb.cert.org/vuls/id/905115Third Party Advisory, US Government Resource
- https://www.oracle.com/security-alerts/cpujan2020.htmlThird Party Advisory
- https://www.oracle.com/security-alerts/cpuoct2020.html
- https://www.synology.com/security/advisory/Synology_SA_19_28Third Party Advisory
- https://www.us-cert.gov/ics/advisories/icsa-19-253-03Third Party Advisory, US Government Resource
- https://www.us-cert.gov/ics/advisories/icsma-20-170-06Third Party Advisory, US Government Resource
- http://www.arubanetworks.com/assets/alert/ARUBA-PSA-2020-010.txtThird Party Advisory
- http://www.openwall.com/lists/oss-security/2019/06/28/2Mailing List, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.