Technical Description

Multiple vulnerabilities have been identified in various Redhat products, which could be exploited by local attackers to bypass security restrictions, disclose sensitive information, cause a denial of service or execute arbitrary code.

The first issue is caused by an error in the Linux kernel memory copy routines when running on certain AMD64 systems, which could allow a local unprivileged user to view potentially sensitive data.

The second vulnerability is caused by a race condition in the Linux kernel process-tracing system call "ptrace", which could allow a local unprivileged user to cause a denial of service.

The third issue is caused by an error in the Linux kernel 32-bit and 64-bit emulation, which could allow a local unprivileged user to prepare and run a specially crafted binary to disclose sensitive data.

The fourth vulnerability is caused by an error is caused by a missing length validation check in the Linux kernel DCCP module reconciliation feature. This could allow a local unprivileged user to cause a heap overflow, gaining privileges for arbitrary code execution.

The fifth issue is caused by an error in kernel when handling string operations in the opposite way to the GNU Compiler Collection (GCC), which could allow a local unprivileged user to cause memory corruption.

Affected Products

Red Hat Desktop (v. 4)
Red Hat Enterprise Linux AS (v. 4)
Red Hat Enterprise Linux ES (v. 4)
Red Hat Enterprise Linux WS (v. 4)
Red Hat Enterprise Linux (v. 5 server)
Red Hat Enterprise Linux Desktop (v. 5 client)

Solution

Upgrade the affected packages :
https://rhn.redhat.com/

References

http://www.vupen.com/english/advisories/2008/1938
https://rhn.redhat.com/errata/RHSA-2008-0519.html
https://rhn.redhat.com/errata/RHSA-2008-0508.html

Credits

Vulnerabilities reported by Tavis Ormandy, Brandon Edwards, and Alexey Dobriyan.

ChangeLog

2008-06-27 : Initial release

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