Use After Free in Arista Eos
CVE-2017-18017
The tcpmss_mangle_packet function in net/netfilter/xt_TCPMSS.c in the Linux kernel before 4.11, and 4.9.x before 4.9.36, allows remote attackers to cause a denial of service (use-after-free and memory corruption) or possibly have unspecified other impact by leveraging the presence of xt_TCPMSS in an iptables action.
Vulnerability class: Use-After-Free
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.528 (99.0th percentile), scored .
High probability of exploitation in the next 30 days — patch promptly. 99th percentile — 99.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.528 · newest: 0.528 · change: 0.000
Affected products
- Arista Eos — versions 4.20.1fx-virtual-router
- F5 Arx
- Linux Kernel
- OpenStack Cloud Magnum Orchestration — versions 7
- Canonical Ubuntu Linux — versions 12.04, 14.04
- Debian Linux — versions 7.0, 8.0
- openSUSE Leap — versions 42.3
- Red Hat Enterprise Linux Desktop — versions 6.0, 7.0
- Red Hat Enterprise Linux Eus — versions 7.3, 7.4, 7.6
- Red Hat Enterprise Linux For Real Time — versions 7
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.debian.org/security/2018/dsa-4187 (vendor-advisory, Third Party Advisory)
- usn.ubuntu.com/3583-2/ (vendor-advisory, Third Party Advisory)
- patchwork.ozlabs.org/patch/746618/ (Patch, Third Party Advisory)
- access.redhat.com/errata/RHSA-2018:1737 (vendor-advisory, Third Party Advisory)
- www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.36 (Release Notes, Vendor Advisory)
- lkml.org/lkml/2017/4/2/13 (Third Party Advisory)
- access.redhat.com/errata/RHSA-2018:1062 (vendor-advisory, Third Party Advisory)
- access.redhat.com/errata/RHSA-2018:1319 (vendor-advisory, Third Party Advisory)
- help.ecostruxureit.com/display/public/UADCE725/Security+fixes+in+StruxureWare+D… (Third Party Advisory)
- usn.ubuntu.com/3583-1/ (vendor-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2017-18017?
- CVE-2017-18017 is a critical-severity vulnerability in Arista Eos, classified under Use After Free. CVSS score: 9.8/10. Published 2018-01-03.
- How severe is CVE-2017-18017?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2017-18017 known to be exploited?
- 5 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.