Gentoo update for GCC

1) Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)

EUVDB-ID: #VU28259

Risk: Low

CVSSv4.0: 1.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2019-15847

CWE-ID: CWE-338 - Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)

Exploit availability: No

Description

The vulnerability allows an attacker to bypass implemented security restrictions.

The vulnerability exists due to the POWER9 backend in GNU Compiler Collection (GCC) can optimize multiple calls of the __builtin_darn intrinsic into a single call, thus reducing the entropy of the random number generator. This vulnerability may weaken security features that rely on random number generator.

Mitigation

Update the affected packages.
sys-devel/gcc to version: 10.0

Vulnerable software versions

Gentoo Linux: All versions

sys-devel/gcc: before 10.0

CPE2.3

• cpe:2.3:o:gentoo:gentoo_linux:*:*:*:*:*:*:*:*
• cpe:2.3:a:gentoo:sys-devel_gcc:*:*:*:*:*:gentoo_linux:*:*

External links

https://security.gentoo.org/glsa/202409-22

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.