systemd up to v245 Incomplete Fix CVE-2017-1000082 Username privileges management

Summaryinfo

A vulnerability, which was classified as critical, has been found in systemd up to v245. This impacts an unknown function of the component Incomplete Fix CVE-2017-1000082. This manipulation as part of Username causes input validation. The identification of this vulnerability is CVE-2020-13776. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability classified as critical was found in systemd up to v245. Affected by this vulnerability is an unknown functionality of the component Incomplete Fix CVE-2017-1000082. The manipulation as part of a Username leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

systemd through v245 mishandles numerical usernames such as ones composed of decimal digits or 0x followed by hex digits, as demonstrated by use of root privileges when privileges of the 0x0 user account were intended. NOTE: this issue exists because of an incomplete fix for CVE-2017-1000082.

The weakness was shared 06/03/2020. This vulnerability is known as CVE-2020-13776 since 06/03/2020. The attack can be launched remotely. The successful exploitation needs a single authentication. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 06/09/2025). MITRE ATT&CK project uses the attack technique T1068 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 236564 (Alibaba Cloud Linux 3 : 0039: systemd (ALINUX3-SA-2022:0039)), which helps to determine the existence of the flaw in a target environment.

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

The vulnerability is also documented in the vulnerability database at Tenable (236564). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Name

• systemd

Version

• v245

License

• open-source

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Entryinfo

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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