Debian DSA-4531-1 Security Update

Die Debian Community und Entwickler haben ein Security Update am 25.09.2019 veröffentlicht. Insgesamt werden 5 zum Teil kritische Lücken geschlossen. Für Stretch wurden die Updates in Version 4.9.189-3+deb9u1 behoben. In der aktuellen Stable Buster, sind die Updates in Version 4.19.67-2+deb10u1 enthalten.

Debian DSA-4531-1 Release Notes

• CVE-2019-14821Matt Delco reported a race condition in KVM’s coalesced MMIO facility, which could lead to out-of-bounds access in the kernel. A local attacker permitted to access /dev/kvm could use this to cause a denial of service (memory corruption or crash) or possibly for privilege escalation.
• CVE-2019-14835Peter Pi of Tencent Blade Team discovered a missing bounds check in vhost_net, the network back-end driver for KVM hosts, leading to a buffer overflow when the host begins live migration of a VM. An attacker in control of a VM could use this to cause a denial of service (memory corruption or crash) or possibly for privilege escalation on the host.
• CVE-2019-15117Hui Peng and Mathias Payer reported a missing bounds check in the usb-audio driver’s descriptor parsing code, leading to a buffer over-read. An attacker able to add USB devices could possibly use this to cause a denial of service (crash).
• CVE-2019-15118Hui Peng and Mathias Payer reported unbounded recursion in the usb-audio driver’s descriptor parsing code, leading to a stack overflow. An attacker able to add USB devices could use this to cause a denial of service (memory corruption or crash) or possibly for privilege escalation. On the amd64 architecture, and on the arm64 architecture in buster, this is mitigated by a guard page on the kernel stack, so that it is only possible to cause a crash.
• CVE-2019-15902Brad Spengler reported that a backporting error reintroduced a spectre-v1 vulnerability in the ptrace subsystem in the ptrace_get_debugreg() function.

Quelle: https://www.debian.org/security/2019/dsa-4531