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CVE-2021-32842— Path Traversal in SharpZipLib

Quick assessment

Affected
icsharpcode sharpziplib
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.

SharpZipLib（#ziplib，前称NZipLib）是ICSharpCode（Icsharpcode）团队的一个开源的用在.NET平台中的C#压缩解压库，它支持解压和压缩Zip、GZip、BZip2、Tar等格式的文件。 SharpZipLib 存在安全漏洞，该漏洞源于不强制 _baseDirectory 以斜线结尾。 如果 _baseDirectory 没有像 /home/user/dir 那样以斜线结尾，则可以创建一个文件，其名称以目标目录开始，比该目录上一层，即 /home/user/dir

CVSS 4.0 · Medium EPSS 0.90% · P58

Possible ATT&CK Techniques 1 AI

T1564.004 · NTFS File Attributes
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I. Basic Information for CVE-2021-32842

Vulnerability Information
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Vulnerability Title
Path Traversal in SharpZipLib
Source: CVE Program / CVE List V5
Vulnerability Description
SharpZipLib (or #ziplib) is a Zip, GZip, Tar and BZip2 library. Starting version 1.0.0 and prior to version 1.3.3, a check was added if the destination file is under a destination directory. However, it is not enforced that `_baseDirectory` ends with slash. If the _baseDirectory is not slash terminated like `/home/user/dir` it is possible to create a file with a name thats begins as the destination directory one level up from the directory, i.e. `/home/user/dir.sh`. Because of the file name and destination directory constraints, the arbitrary file creation impact is limited and depends on the use case. Version 1.3.3 fixed this vulnerability.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
SharpZipLib 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
SharpZipLib（#ziplib，前称NZipLib）是ICSharpCode（Icsharpcode）团队的一个开源的用在.NET平台中的C#压缩解压库，它支持解压和压缩Zip、GZip、BZip2、Tar等格式的文件。 SharpZipLib 存在安全漏洞，该漏洞源于不强制 _baseDirectory 以斜线结尾。 如果 _baseDirectory 没有像 /home/user/dir 那样以斜线结尾，则可以创建一个文件，其名称以目标目录开始，比该目录上一层，即 /home/user/dir
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
icsharpcode sharpziplib 1.3.3 ~ 1.3.3 -

II. Public POCs for CVE-2021-32842

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III. Intelligence Information for CVE-2021-32842

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Other References for CVE-2021-32842 (1)

Other References for CVE-2021-32842 (1)

Same Patch Batch · icsharpcode · 2022-01-26 · 3 CVEs total

CVE-2021-32840 7.3 HIGH Path Traversal in SharpZipLib
CVE-2021-32841 4.0 MEDIUM Path Traversal in SharpZipLib

IV. Related Vulnerabilities

Same product: sharpziplib
Same vendor: icsharpcode
Same weakness: CWE-22

V. Comments for CVE-2021-32842

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