CVE-2021-32841

Path Traversal in SharpZipLib

MEDIUM

5.3

CVSS Score

Published: January 26, 2022 at 09:10 PM UTC

Updated: June 17, 2026 at 03:53 AM UTC

2 products affected across 2 vendorsSharpZipLibProject Sharpziplib

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Severity

MEDIUM5.3

Exploit prediction

EPSS 1%

SSVC

PoC

Description

SharpZipLib (or #ziplib) is a Zip, GZip, Tar and BZip2 library. Starting version 1.3.0 and prior to version 1.3.3, a check was added if the destination file is under destination directory. However, it is not enforced that `destDir` ends with slash. If the `destDir` is not slash terminated like `/home/user/dir` it is possible to create a file with a name thats begins with the destination 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 contains a patch for this vulnerability.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

SharpZipLib · Sharpziplib Projectnuget

95%

1.3.0 ≤ v < 1.3.3

Affected range stops below 1.3.3, so it looks safe — our inference, not a vendor statement

Project Sharpziplib · Icsharpcode

60%

v < 1.3.31.3.0 ≤ v < 1.3.0*1.3.0

Affected range stops below 1.3.0*, so it looks safe — our inference, not a vendor statement

Affected range stops below 1.3.3, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://github.com/icsharpcode/SharpZipLib/commit/5c3b293de5d65b108e7f2cd0ea8f81c1b8273f78

References (3)

x_refsource_MISCPatchThird Party Advisory

Source: [email protected]

https://github.com/icsharpcode/SharpZipLib/commit/5c3b293de5d65b108e7f2cd0ea8f81c1b8273f78

x_refsource_MISCRelease NotesThird Party Advisory

Source: [email protected]

https://github.com/icsharpcode/SharpZipLib/releases/tag/v1.3.3

x_refsource_CONFIRMExploitThird Party Advisory

Source: [email protected]

https://securitylab.github.com/advisories/GHSL-2021-125-sharpziplib/

SSVC — Action Prioritization

SSVCPoCNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.3MEDIUM[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: NONE
Integrity: LOW
Availability: NONE

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-22

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