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Vulnerability of Oniguruma: buffer overflow via concat_opt_exact_str

Synthesis of the vulnerability 

An attacker can trigger a buffer overflow via concat_opt_exact_str() of Oniguruma, in order to trigger a denial of service, and possibly to run code.
Impacted products: Debian, Fedora, Solaris.
Severity of this bulletin: 2/4.
Creation date: 09/10/2020.
Références of this threat: CVE-2020-26159, FEDORA-2020-952c499e9d, FEDORA-2020-d53469eceb, VIGILANCE-VUL-33531.

Description of the vulnerability 

An attacker can trigger a buffer overflow via concat_opt_exact_str() of Oniguruma, in order to trigger a denial of service, and possibly to run code.
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This computer weakness alert impacts software or systems such as Debian, Fedora, Solaris.

Our Vigil@nce team determined that the severity of this weakness note 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 weakness bulletin.

Solutions for this threat 

Debian 9: new libonig packages.
New packages are available:
  Debian 9: libonig 6.1.3-2+deb9u1

Fedora: new oniguruma packages.
New packages are available:
  Fedora 31: oniguruma 6.9.4-2.fc31
  Fedora 32: oniguruma 6.9.5-3.rev1.fc32

Oracle Solaris: patch for third party software of October 2020 v3.
A patch is available:
  https://support.oracle.com/rs?type=doc&id=1448883.1
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