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CVE-2016-2781: chroot in GNU coreutils, when used with --userspec, allows local users to escape to the parent session via...

chroot in GNU coreutils, when used with --userspec, allows local users to escape to the parent session via a crafted TIOCSTI ioctl call, which pushes characters to the terminal's input buffer.

MediumCVSS 4.6Not KEV-listedUpdated
Glexia's TakeAutomated analysis

Security readout for executives and security teams

This flaw affects GNU coreutils chroot when used with --userspec. A local user may manipulate the controlling terminal and escape back into the parent session, risking limited data exposure or command influence. It is not remotely exploitable from the provided evidence. Exposure is most likely on Unix-like systems using GNU coreutils chroot with --userspec in interactive sessions involving less-trusted local users. The source bundle does not identify specific affected versions, distributions, or package fixes. Treat as a targeted local-access risk, not an internet-wide emergency. Prioritize shared administrative hosts, bastions, build systems, and environments where untrusted users interact with chroot workflows. Mitigation focus: Check vendor or distribution guidance for affected coreutils packages and fixed versions.; Avoid using interactive chroot --userspec sessions with untrusted local users.; Restrict local shell access and chroot administration to trusted operators..

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Potential ATT&CK relevance

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CVE-2016-2781 mapping review

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
4.6 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

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1CVSS vectors
0Timeline events
0ADP providers
2Source links

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
4.6CVSS 3.1MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N1.52.7Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

4.6Medium
CVSS 3.1 vector shape for CVE-2016-2781Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone
Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

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