Lucene search

K
debiancveDebian Security Bug TrackerDEBIANCVE:CVE-2021-43784
HistoryDec 06, 2021 - 6:15 p.m.

CVE-2021-43784

2021-12-0618:15:00
Debian Security Bug Tracker
security-tracker.debian.org
17

5 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

LOW

Integrity Impact

LOW

Availability Impact

LOW

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L

6 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

MEDIUM

Authentication

SINGLE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:N/AC:M/Au:S/C:P/I:P/A:P

0.008 Low

EPSS

Percentile

81.5%

runc is a CLI tool for spawning and running containers on Linux according to the OCI specification. In runc, netlink is used internally as a serialization system for specifying the relevant container configuration to the C portion of the code (responsible for the based namespace setup of containers). In all versions of runc prior to 1.0.3, the encoder did not handle the possibility of an integer overflow in the 16-bit length field for the byte array attribute type, meaning that a large enough malicious byte array attribute could result in the length overflowing and the attribute contents being parsed as netlink messages for container configuration. This vulnerability requires the attacker to have some control over the configuration of the container and would allow the attacker to bypass the namespace restrictions of the container by simply adding their own netlink payload which disables all namespaces. The main users impacted are those who allow untrusted images with untrusted configurations to run on their machines (such as with shared cloud infrastructure). runc version 1.0.3 contains a fix for this bug. As a workaround, one may try disallowing untrusted namespace paths from your container. It should be noted that untrusted namespace paths would allow the attacker to disable namespace protections entirely even in the absence of this bug.

OSVersionArchitecturePackageVersionFilename
Debian12allrunc<ย 1.0.3+ds1-1runc_1.0.3+ds1-1_all.deb
Debian11allrunc<=ย 1.0.0~rc93+ds1-5+deb11u3runc_1.0.0~rc93+ds1-5+deb11u3_all.deb
Debian10allrunc<ย 1.0.0~rc6+dfsg1-3+deb10u3runc_1.0.0~rc6+dfsg1-3+deb10u3_all.deb
Debian999allrunc<ย 1.0.3+ds1-1runc_1.0.3+ds1-1_all.deb
Debian13allrunc<ย 1.0.3+ds1-1runc_1.0.3+ds1-1_all.deb

5 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

LOW

Integrity Impact

LOW

Availability Impact

LOW

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L

6 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

MEDIUM

Authentication

SINGLE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:N/AC:M/Au:S/C:P/I:P/A:P

0.008 Low

EPSS

Percentile

81.5%