Home/CVE/utility.c in telnetd in netkit telnet through 0.17 allows remote attackers to execute arbitrary code via short writes or
CVE

CVE-2020-10188

utility.c in telnetd in netkit telnet through 0.17 allows remote attackers to execute arbitrary code via short writes or

utility.c in telnetd in netkit telnet through 0.17 allows remote attackers to execute arbitrary code via short writes or urgent data, because of a buffer overflow involving the netclear and nextitem functions.

CRITICAL · CVSS 9.8 EPSS 0.08404
Schedule remediation
  • EPSS percentile: top 8% of all CVEs by exploitation likelihood
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
▤

Affected Products & Versions

10
netkit telnet project netkit telnet<= 0.17
fedoraproject fedoraall versions
debian linuxall versions
arista eos<= 4.20.15
arista eos>= 4.21.0 and <= 4.21.10m
arista eos>= 4.22 and <= 4.22.4m
arista eos>= 4.23 and <= 4.23.3m
arista eosall versions
▣

Scoring & Timeline

9.8
CRITICAL · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD06 Mar 2020 · 03:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
⚑

Vendor Advisories

12
usnUSN-7781-1
usnUSN-5048-2
usnUSN-5048-1
cisco-csafcisco-sa-telnetd-EFJrEzPx
suse-csafSUSE-SU-2020:1533-1
🔗

References & Sources

11
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://appgateresearch.blogspot.com/2020/02/bravestarr-fedora-31-netkit-telnetd_28.htmlThird Party Advisory
https://github.com/krb5/krb5-appl/blob/d00cd671dfe945791b33d4f1f6a5c57ae1667ef8/telnet/telnetd/utility.c#L205-L216PatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2020/05/msg00012.htmlMailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2020/08/msg00038.htmlMailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7FMTRRQTYKWZD2GMXX3GLZV46OLPCLVK/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HLU6FL24BSQQEB2SJC26NLJ2MANQDA7M/
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