Date: Wed, 26 Oct 2011 10:11:12 -0600 From: Kurt Seifried <kseifried@...hat.com> To: oss-security@...ts.openwall.com CC: Vasiliy Kulikov <segoon@...nwall.com> Subject: Re: CVE Request -- kernel: sysctl: restrict write access to dmesg_restrict On 10/26/2011 09:53 AM, Vasiliy Kulikov wrote: > Hi, > > On Wed, Oct 26, 2011 at 09:26 -0600, Kurt Seifried wrote: >> On 10/26/2011 09:16 AM, Petr Matousek wrote: >>> 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, >> Please use CVE-2011-4080 for this issue. > Why does it worth CVE? This allows an attacker to bypass a security boundary. The root user is able to gain privileges they shouldn't have. -- -Kurt Seifried / Red Hat Security Response Team
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