sudo up to 1.8.29 Descriptor /proc/#####/fd/3 race condition ⚔ [Disputed]

Summaryinfo

A vulnerability categorized as critical has been discovered in sudo up to 1.8.29. This impacts an unknown function of the file /proc/#####/fd/3 of the component Descriptor Handler. Such manipulation leads to race condition. This vulnerability is traded as CVE-2019-18684. An attack has to be approached locally. There is no exploit available. The actual existence of this vulnerability is currently in question.

Detailsinfo

A vulnerability was found in sudo up to 1.8.29 (Operating System Utility Software) and classified as critical. Affected by this issue is an unknown functionality of the file /proc/#####/fd/3 of the component Descriptor Handler. The manipulation with an unknown input leads to a race condition vulnerability. Using CWE to declare the problem leads to CWE-362. The product contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently. Impacted is confidentiality, integrity, and availability. CVE summarizes:

Sudo through 1.8.29 allows local users to escalate to root if they have write access to file descriptor 3 of the sudo process. This occurs because of a race condition between determining a uid, and the setresuid and openat system calls. The attacker can write "ALL ALL=(ALL) NOPASSWD:ALL" to /proc/#####/fd/3 at a time when Sudo is prompting for a password.

The weakness was shared 11/04/2019. This vulnerability is handled as CVE-2019-18684 since 11/04/2019. The attack needs to be approached locally. The successful exploitation needs a simple authentication. There are known technical details, but no exploit is available.

The real existence of this vulnerability is still doubted at the moment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

• Operating System Utility Software

Name

• sudo

Version

• 1.8.0
• 1.8.1
• 1.8.2
• 1.8.3
• 1.8.4
• 1.8.5
• 1.8.6
• 1.8.7
• 1.8.8
• 1.8.9
• 1.8.10
• 1.8.11
• 1.8.12
• 1.8.13
• 1.8.14
• 1.8.15
• 1.8.16
• 1.8.17
• 1.8.18
• 1.8.19
• 1.8.20
• 1.8.21
• 1.8.22
• 1.8.23
• 1.8.24
• 1.8.25
• 1.8.26
• 1.8.27
• 1.8.28
• 1.8.29

License

• open-source

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

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Entryinfo

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