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Argument injection in lettre

Moderate severity GitHub Reviewed Published Nov 11, 2020 in lettre/lettre • Updated Jun 13, 2023

Package

cargo lettre (Rust)

Affected versions

>= 0.9.0, < 0.9.5
>= 0.8.0, < 0.8.4
>= 0.7.0, < 0.7.1

Patched versions

0.9.5
0.8.4
0.7.1

Description

Impact

Affected versions of lettre allowed argument injection to the sendmail command. It was possible, using forged to addresses, to pass arbitrary arguments to the sendmail executable.

Depending on the implementation (original sendmail, postfix, exim, etc.) it could be possible in some cases to write email data into abritrary files (using sendmail's logging features).

NOTE: This vulnerability only affects the sendmail transport. Others, including smtp, are not affected.

Fix

The flaw is corrected by modifying the executed command to stop parsing arguments before passing the destination addresses.

References

References

@amousset amousset published to lettre/lettre Nov 11, 2020
Reviewed Aug 18, 2021
Published to the GitHub Advisory Database Aug 25, 2021
Last updated Jun 13, 2023

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

EPSS score

0.088%
(39th percentile)

Weaknesses

CVE ID

CVE-2020-28247

GHSA ID

GHSA-vc2p-r46x-m3vx

Source code

Credits

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