THREATPORT/VULNERABILITY/CVE-2019-18634
HIGH SEVERITY

CVE-2019-18634

Sudo vulnerability

CVSS
7.8
EPSS
19.4%
EPSS pct
97th
Exploited
No known
In Sudo before 1.8.26, if pwfeedback is enabled in /etc/sudoers, users can trigger a stack-based buffer overflow in the privileged sudo process. (pwfeedback is a default setting in Linux Mint and elementary OS; however, it is NOT the default for upstream and many other packages, and would exist only if enabled by an administrator.) The attacker needs to deliver a long string to the stdin of getln() in tgetpass.c.
Affected vendor
Sudo Project
Affected product
Sudo
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness type (CWE)
Published
2020-01-29

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable with local access, low attack complexity, requiring low privileges, no user interaction. Successful exploitation leads to high impact to confidentiality, high impact to integrity, high impact to availability.

Its EPSS score of 19.4% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it above 97% of all scored CVEs.

Check your external exposure to CVE-2019-18634

  • Confirm whether Sudo Project Sudo is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2019-18634.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2019-18634

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2019-18634 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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