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Vulnerability of musl: buffer overflow via wcsnrtombs

Synthesis of the vulnerability 

An attacker can trigger a buffer overflow via wcsnrtombs() of musl, in order to trigger a denial of service, and possibly to run code.
Vulnerable products: Debian, Fedora, QRadar SIEM.
Severity of this weakness: 2/4.
Creation date: 01/12/2020.
Références of this bulletin: 6409294, CVE-2020-28928, DLA-2474-1, FEDORA-2021-0cf36f9134, FEDORA-2021-4892dbbf76, VIGILANCE-VUL-34008.

Description of the vulnerability 

An attacker can trigger a buffer overflow via wcsnrtombs() of musl, in order to trigger a denial of service, and possibly to run code.
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This cybersecurity weakness impacts software or systems such as Debian, Fedora, QRadar SIEM.

Our Vigil@nce team determined that the severity of this security vulnerability is medium.

The trust level is of type confirmed by the editor, with an origin of document.

An attacker with a expert ability can exploit this vulnerability bulletin.

Solutions for this threat 

Debian 9: new musl packages.
New packages are available:
  Debian 9: musl 1.1.16-3+deb9u1

Fedora 33-34: new musl packages.
New packages are available:
  Fedora 33: musl 1.2.2-1.fc33
  Fedora 34: musl 1.2.2-1.fc34

IBM QRadar SIEM: fixed versions for IBM Security QRadar Analyst Workflow.
Fixed versions are indicated in information sources.
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