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CVE-2021-39208— WriteEntryToDirectory used for an archive extraction is vulnerable to partial path traversal.

Quick assessment

Affected
adamhathcock sharpcompress
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.

SharpCompress是一个纯C#压缩库。用于 .NET Standard 2.0、2.1、.NET Core 3.1 和 .NET 5.0 。 SharpCompress 存在路径遍历漏洞，该漏洞源于ExtractFullPath设置为 true，SharpCompress 会在 destinationDirectory 下重新创建目录层次结构。攻击者可利用该漏洞访问受限目录之外的位置。

CVSS 4.3 · Medium EPSS 1.19% · P66

Possible ATT&CK Techniques 1 AI

T1046 · Network Service Discovery
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I. Basic Information for CVE-2021-39208

Vulnerability Information
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Vulnerability Title
WriteEntryToDirectory used for an archive extraction is vulnerable to partial path traversal.
Source: CVE Program / CVE List V5
Vulnerability Description
SharpCompress is a fully managed C# library to deal with many compression types and formats. Versions prior to 0.29.0 are vulnerable to partial path traversal. SharpCompress recreates a hierarchy of directories under destinationDirectory if ExtractFullPath is set to true in options. In order to prevent extraction outside the destination directory the destinationFileName path is verified to begin with fullDestinationDirectoryPath. However, prior to version 0.29.0, it is not enforced that fullDestinationDirectoryPath ends with slash. If the destinationDirectory 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. This issue is fixed in SharpCompress version 0.29.0.
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
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
SharpCompress 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
SharpCompress是一个纯C#压缩库。用于 .NET Standard 2.0、2.1、.NET Core 3.1 和 .NET 5.0 。 SharpCompress 存在路径遍历漏洞，该漏洞源于ExtractFullPath设置为 true，SharpCompress 会在 destinationDirectory 下重新创建目录层次结构。攻击者可利用该漏洞访问受限目录之外的位置。
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
adamhathcock sharpcompress < 0.29.0 -

II. Public POCs for CVE-2021-39208

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III. Intelligence Information for CVE-2021-39208

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Patches & Fixes for CVE-2021-39208 (1)

Vendor Advisories for CVE-2021-39208 (1)

Other References for CVE-2021-39208 (1)

IV. Related Vulnerabilities

Same product: sharpcompress
Same vendor: adamhathcock
Same weakness: CWE-22

V. Comments for CVE-2021-39208

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