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CVE-2021-29488— Creation of files outside the Download Folder through malicious PAR2 files

Quick assessment

Affected
sabnzbd sabnzbd
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

sabnzbd是一个应用软件。一个Python编写的开源二进制新闻阅读器。 SABnzbd 3.2.1RC1 存在安全漏洞，该漏洞源于可以欺骗filessystem .renamer()函数，通过恶意PAR2文件将已下载的文件写入配置的下载文件夹之外。

CVSS 4.3 · Medium EPSS 0.92% · P58
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I. Basic Information for CVE-2021-29488

Vulnerability Information
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Vulnerability Title
Creation of files outside the Download Folder through malicious PAR2 files
Source: CVE Program / CVE List V5
Vulnerability Description
SABnzbd is an open source binary newsreader. A vulnerability was discovered in SABnzbd that could trick the `filesystem.renamer()` function into writing downloaded files outside the configured Download Folder via malicious PAR2 files. A patch was released as part of SABnzbd 3.2.1RC1. As a workaround, limit downloads to NZBs without PAR2 files, deny write permissions to the SABnzbd process outside areas it must access to perform its job, or update to a fixed version.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
相对路径遍历
Source: CVE Program / CVE List V5
Vulnerability Title
SABnzbd 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
sabnzbd是一个应用软件。一个Python编写的开源二进制新闻阅读器。 SABnzbd 3.2.1RC1 存在安全漏洞，该漏洞源于可以欺骗filessystem .renamer()函数，通过恶意PAR2文件将已下载的文件写入配置的下载文件夹之外。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
sabnzbd sabnzbd < 3.0.0 -
sabnzbd sabnzbd < 3.2.1 -

II. Public POCs for CVE-2021-29488

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III. Intelligence Information for CVE-2021-29488

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Vendor Advisories for CVE-2021-29488 (1)

IV. Related Vulnerabilities

Same product: sabnzbd
Same vendor: sabnzbd
Same weakness: CWE-23

V. Comments for CVE-2021-29488

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