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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
5.3
/ 10

CVSS base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Weaknesses

CVE ID

CVE-2020-28247

GHSA ID

GHSA-vc2p-r46x-m3vx

Source code

Credits

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