SB2011103103 - Amazon Linux AMI update for kernel
Published: October 31, 2011
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 5 secuirty vulnerabilities.
1) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2011-1833)
The vulnerability allows a remote non-authenticated attacker to read and manipulate data.
Race condition in the ecryptfs_mount function in fs/ecryptfs/main.c in the eCryptfs subsystem in the Linux kernel before 3.1 allows local users to bypass intended file permissions via a mount.ecryptfs_private mount with a mismatched uid.
2) Input validation error (CVE-ID: CVE-2011-2723)
The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.
The skb_gro_header_slow function in include/linux/netdevice.h in the Linux kernel before 2.6.39.4, when Generic Receive Offload (GRO) is enabled, resets certain fields in incorrect situations, which allows remote attackers to cause a denial of service (system crash) via crafted network traffic.
3) Resource exhaustion (CVE-ID: CVE-2011-2918)
The vulnerability allows a local authenticated user to perform a denial of service (DoS) attack.
The Performance Events subsystem in the Linux kernel before 3.1 does not properly handle event overflows associated with PERF_COUNT_SW_CPU_CLOCK events, which allows local users to cause a denial of service (system hang) via a crafted application.
4) Input validation error (CVE-ID: CVE-2011-3188)
The vulnerability allows a remote non-authenticated attacker to #BASIC_IMPACT#.
The (1) IPv4 and (2) IPv6 implementations in the Linux kernel before 3.1 use a modified MD4 algorithm to generate sequence numbers and Fragment Identification values, which makes it easier for remote attackers to cause a denial of service (disrupted networking) or hijack network sessions by predicting these values and sending crafted packets.
5) Buffer overflow (CVE-ID: CVE-2011-3191)
The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.
Integer signedness error in the CIFSFindNext function in fs/cifs/cifssmb.c in the Linux kernel before 3.1 allows remote CIFS servers to cause a denial of service (memory corruption) or possibly have unspecified other impact via a large length value in a response to a read request for a directory.
Remediation
Install update from vendor's website.