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CVE-2021-40839

Date: September 9, 2021

The rencode package through 1.0.6 for Python allows an infinite loop in typecode decoding (such as via ;\x2f\x7f), enabling a remote attack that consumes CPU and memory.

Language: Python

Severity Score

7.5

Related Resources (15)

Url: https://security.netapp.com/advisory/ntap-20211008-0001

Url: https://github.com/aresch/rencode/pull/29

Url: https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BMVQRPDVSVZNGGX57CFKCYT3DEYO4QB6/

Url: https://nvd.nist.gov/vuln/detail/CVE-2021-40839

Url: https://github.com/pypa/advisory-database/tree/main/vulns/rencode/PYSEC-2021-345.yaml

Url: https://seclists.org/fulldisclosure/2021/Sep/16

Url: https://pypi.org/project/rencode/#history

Url: https://security.netapp.com/advisory/ntap-20211008-0001/

Url: https://github.com/aresch/rencode/commit/572ff74586d9b1daab904c6f7f7009ce0143bb75

Url: https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BMVQRPDVSVZNGGX57CFKCYT3DEYO4QB6

Url: https://github.com/advisories/GHSA-gh8j-2pgf-x458

Url: https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MCLETLGVM5DBX6QNHQFW6TWGO5T3DENY/

Url: https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MCLETLGVM5DBX6QNHQFW6TWGO5T3DENY

Url: https://github.com/aresch/rencode

Url: https://www.mend.io/vulnerability-database/CVE-2021-40839

Severity Score

7.5

Weakness Type (CWE)

Loop with Unreachable Exit Condition ('Infinite Loop')

CWE-835

CVSS v3.1

Base Score:	7.5
Attack Vector (AV):	NETWORK
Attack Complexity (AC):	LOW
Privileges Required (PR):	NONE
User Interaction (UI):	NONE
Scope (S):	UNCHANGED
Confidentiality (C):	NONE
Integrity (I):	NONE
Availability (A):	HIGH

CVSS v2

Base Score:	5.0
Access Vector (AV):	NETWORK
Access Complexity (AC):	LOW
Authentication (AU):	NONE
Confidentiality (C):	NONE
Integrity (I):	NONE
Availability (A):	PARTIAL
Additional information:

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