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Vulnerability Assessment & Network Security Forums |
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If through a vulnerability assessment, a network security issue is detected for the vulnerability below, applying the appropriate security patches in a timely matter is very important. If you have detected that your system has already been compromised, following CERT's Network Security recovery document will assist with recommended steps for system recovery. Home >> Browse Vulnerability Assessment Database >> Gentoo Local Security Checks >> [GLSA-200408-24] Linux Kernel: Multiple information leaks Vulnerability Assessment Details
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[GLSA-200408-24] Linux Kernel: Multiple information leaks |
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Linux Kernel: Multiple information leaks Detailed Explanation for this Vulnerability Assessment The remote host is affected by the vulnerability described in GLSA-200408-24 (Linux Kernel: Multiple information leaks) The Linux kernel permits a local attacker to obtain sensitive kernel information by gaining access to kernel memory via several leaks in the /proc interfaces. These vulnerabilities exist in various drivers which make up a working Linux kernel, some of which are present across all architectures and configurations. CVE-2004-0415 deals with addressing invalid 32 to 64 bit conversions in the kernel, as well as insecure direct access to file offset pointers in kernel code which can be modified by the open(...), lseek(...) and other core system I/O functions by a possible hacker. CVE-2004-0685 deals with certain USB drivers using uninitialized structures and then using the copy_to_user(...) kernel call to copy these structures. This may leak uninitialized kernel memory, which can contain sensitive information from user applications. Finally, a race condition with the /proc/.../cmdline node was found, permiting environment variables to be read while the process was still spawning. If the race is won, environment variables of the process, which might not be owned by the attacker, can be read. Impact These vulnerabilities permit a local unprivileged attacker to access segments of kernel memory or environment variables which may contain sensitive information. Kernel memory may contain passwords, data transferred between processes, any memory which applications did not clear upon exiting as well as the kernel cache and kernel buffers. This information may be used to read sensitive data, open other attack vectors for further exploitation or cause a Denial of Service if the attacker can gain superuser access via the leaked information. Workaround There is no temporary workaround for any of these information leaks other than totally disabling /proc support - otherwise, a kernel upgrade is required. A list of unaffected kernels is provided along with this announcement. References: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-0415 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-0685 Solution: Users are encouraged to upgrade to the latest available sources for their system: # emerge sync # emerge -pv your-favorite-sources # emerge your-favorite-sources # # Follow usual procedure for compiling and installing a kernel. # # If you use genkernel, run genkernel as you would normally. Network Security Threat Level: Medium Networks Security ID: Vulnerability Assessment Copyright: (C) 2005 Michel Arboi |
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