Date: Wed, 26 Oct 2011 17:16:12 +0200 From: Petr Matousek <pmatouse@...hat.com> To: oss-security@...ts.openwall.com Subject: CVE Request -- kernel: sysctl: restrict write access to dmesg_restrict When dmesg_restrict is set to 1 CAP_SYS_ADMIN is needed to read the kernel ring buffer. But a root user without CAP_SYS_ADMIN is able to reset dmesg_restrict to 0. This is an issue when e.g. LXC (Linux Containers) are used and complete user space is running without CAP_SYS_ADMIN. A unprivileged and jailed root user can bypass the dmesg_restrict protection. Introduced by: eaf06b241b091357e72b76863ba16e89610d31bd Fixed by: bfdc0b497faa82a0ba2f9dddcf109231dd519fcc Thanks, -- Petr Matousek / Red Hat Security Response Team
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