SB2012062215 - Permissions, Privileges, and Access Controls in Linux kernel

Description

This security bulletin contains information about 1 vulnerability.

1) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2011-1021)

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

CVSSv4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N]

The vulnerability allows a remote non-authenticated attacker to manipulate or delete data.

drivers/acpi/debugfs.c in the Linux kernel before 3.0 allows local users to modify arbitrary kernel memory locations by leveraging root privileges to write to the /sys/kernel/debug/acpi/custom_method file. NOTE: this vulnerability exists because of an incomplete fix for CVE-2010-4347.

Remediation

Install update from vendor's website.

References

• http://ftp.osuosl.org/pub/linux/kernel/v3.0/ChangeLog-3.0
• http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=526b4af47f44148c9d665e57723ed9f86634c6e3
• http://www.openwall.com/lists/oss-security/2011/02/25/5
• https://bugzilla.redhat.com/show_bug.cgi?id=680841
• https://github.com/torvalds/linux/commit/526b4af47f44148c9d665e57723ed9f86634c6e3