CVE-2021-20235

There's a flaw in the zeromq server in versions before 4.3.3 in src/decoder_allocators.hpp. The decoder static allocator could have its sized changed, but the buffer would remain the same as it is a static buffer. A remote, unauthenticated attacker who sends a crafted request to the zeromq server could trigger a buffer overflow WRITE of arbitrary data if CURVE/ZAP authentication is not enabled. The greatest impact of this flaw is to application availability, data integrity, and confidentiality.

CVSS v3 8.1 HIGH
CVSS v2.0 6.8 MEDIUM

8.1^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.2 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

6.8^/10

CVSS v2.0 : MEDIUM

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

Exploitability : 8.6 / Impact : 6.4

Access Vector NETWORK

Access Complexity MEDIUM

Authentication NONE

Confidentiality Impact PARTIAL

Integrity Impact PARTIAL

Availability Impact PARTIAL

References

Link	Resource
https://bugzilla.redhat.com/show_bug.cgi?id=1921983	Issue Tracking Patch Third Party Advisory
https://github.com/zeromq/libzmq/security/advisories/GHSA-fc3w-qxf5-7hp6	Patch Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1921983	Issue Tracking Patch Third Party Advisory
https://github.com/zeromq/libzmq/security/advisories/GHSA-fc3w-qxf5-7hp6	Patch Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:zeromq:libzmq:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2021-04-01 14:15

Updated : 2024-11-21 05:46

NVD link : CVE-2021-20235

Mitre link : CVE-2021-20235

CVE.ORG link : CVE-2021-20235

JSON object : View

Products Affected

zeromq

libzmq

CWE

CWE-120

Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

CWE-787

Out-of-bounds Write

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