SB2019042410 - Improper input validation in libseccomp-golang

Description

This security bulletin contains information about 1 vulnerability.

1) Input validation error (CVE-ID: CVE-2017-18367)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to bypass certain security restrictions.

The vulnerability exists due to insufficient validation of user-supplied input in libseccomp-golang. The software incorrectly generates BPFs that OR multiple arguments rather than ANDing them. A process running under a restrictive seccomp filter that specified multiple syscall arguments could bypass intended access restrictions by specifying a single matching argument.

Remediation

Install update from vendor's website.

References

• http://www.openwall.com/lists/oss-security/2019/04/25/6
• https://github.com/seccomp/libseccomp-golang/commit/06e7a29f36a34b8cf419aeb87b979ee508e58f9e
• https://github.com/seccomp/libseccomp-golang/issues/22