4.4

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2025-64517

CVE-2025-64517: sudo-rs doesn't record authenticating user properly in timestamp

sudo-rs is a memory safe implementation of sudo and su written in Rust. With Defaults targetpw (or Defaults rootpw) enabled, the password of the target account (or root account) instead of the invoking user is used for authentication. sudo-rs starting in version 0.2.5 and prior to version 0.2.10 incorrectly recorded the invoking user’s UID instead of the authenticated-as user's UID in the authentication timestamp. Any later sudo invocation on the same terminal while the timestamp was still valid would use that timestamp, potentially bypassing new authentication even if the policy would have required it. A highly-privileged user (able to run commands as other users, or as root, through sudo) who knows one password of an account they are allowed to run commands as, would be able to run commands as any other account the policy permits them to run commands for, even if they don't know the password for those accounts. A common instance of this would be that a user can still use their own password to run commands as root (the default behaviour of sudo), effectively negating the intended behaviour of the targetpw or rootpw options. Version 0.2.10 contains a patch for the issue. Versions prior to 0.2.5 are not affected, since they do not offer Defaults targetpw or Defaults rootpw.

(GitHub Advisory)

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CVE-2025-64517

CVE-2025-64517:

4.4

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
sudo-rs	rust	>= 0.2.5, < 0.2.10	0.2.10

Technical Details

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Root Cause Analysis

The vulnerability exists in the timestamp-based authentication caching mechanism of sudo-rs. When Defaults targetpw or Defaults rootpw is enabled in the sudoers configuration, sudo-rs should authenticate using the target user's password. However, the application was incorrectly creating and checking the authentication timestamp file (/var/run/sudo/ts/<username>) using the UID of the user invoking sudo, not the UID of the user being authenticated as.

The patch addresses this by introducing a new AuthUser struct that is passed through the authentication pipeline. This struct holds the context of the user to be authenticated. The key changes are in src/sudo/pipeline.rs and src/system/timestamp.rs.

In src/sudo/pipeline.rs, the auth_and_update_record_file and determine_auth_status functions were modified to use this new AuthUser object when creating or checking timestamp records.

In src/system/timestamp.rs, the functions responsible for interacting with the timestamp file (SessionRecordFile::create, SessionRecordFile::touch, and SessionRecord::matches) were updated to take the AuthUser object and use its UID for all operations.

This ensures that when targetpw is used, the timestamp record is correctly associated with the target user's UID, preventing an attacker who knows one user's password from bypassing authentication for other users they are permitted to impersonate via sudo. The identified functions are the ones directly involved in this flawed logic.

Vulnerable functions

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WAF Protection Rules

WAF Rule

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Reasoning

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