4.3
MEDIUM
CVE-2021-39208
SharpCompress Partial Path Traversal 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.

INFO

Published Date :

Sept. 16, 2021, 3:15 p.m.

Last Modified :

Sept. 28, 2021, 12:40 p.m.

Remotely Exploitable :

Yes !

Impact Score :

1.4

Exploitability Score :

2.8
Affected Products

The following products are affected by CVE-2021-39208 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Sharpcompress_project sharpcompress
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2021-39208.

URL Resource
https://github.com/adamhathcock/sharpcompress/pull/614 Patch Third Party Advisory
https://github.com/adamhathcock/sharpcompress/releases/tag/0.29.0 Release Notes Third Party Advisory
https://github.com/adamhathcock/sharpcompress/security/advisories/GHSA-jp7f-grcv-6mjf Exploit Third Party Advisory

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2021-39208 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2021-39208 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • Initial Analysis by [email protected]

    Sep. 28, 2021

    Action Type Old Value New Value
    Added CVSS V2 NIST (AV:N/AC:L/Au:S/C:N/I:P/A:N)
    Changed Reference Type https://github.com/adamhathcock/sharpcompress/pull/614 No Types Assigned https://github.com/adamhathcock/sharpcompress/pull/614 Patch, Third Party Advisory
    Changed Reference Type https://github.com/adamhathcock/sharpcompress/releases/tag/0.29.0 No Types Assigned https://github.com/adamhathcock/sharpcompress/releases/tag/0.29.0 Release Notes, Third Party Advisory
    Changed Reference Type https://github.com/adamhathcock/sharpcompress/security/advisories/GHSA-jp7f-grcv-6mjf No Types Assigned https://github.com/adamhathcock/sharpcompress/security/advisories/GHSA-jp7f-grcv-6mjf Exploit, Third Party Advisory
    Added CPE Configuration OR *cpe:2.3:a:sharpcompress_project:sharpcompress:*:*:*:*:*:*:*:* versions up to (excluding) 0.29.0
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2021-39208 is associated with the following CWEs:

Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.08 }} 0.02%

score

0.33387

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
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Scope
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