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Linux Kernel Terminal Subsystem Race Condition Vulnerabilities
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Secunia Advisory:
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SA12951
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Release Date:
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2004-10-22
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Popularity:
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9,958 views
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Critical:
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Less critical
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Impact:
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Exposure of system information
Exposure of sensitive information
DoS
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Where:
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From remote
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Solution Status:
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Partial Fix
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| OS: | Linux Kernel 2.2.x
Linux Kernel 2.4.x
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| CVE reference: | CVE-2004-0814
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Description:
Two vulnerabilities have been reported in the Linux kernel, which can be exploited to potentially disclose kernel data or cause a DoS (Denial of Service).
1) A race condition in the terminal subsystem can reportedly be exploited by malicious, local users to cause crashes or disclose small random amounts of kernel data by issuing a certain ioctl call on a terminal interface while another thread is performing a read or write operation.
2) Another race condition in the terminal subsystem can potentially be exploited by malicious people to cause a crash by connecting to a PPP dial-up port, issue a switch from console to PPP, and then time the arrival of sent data with the line discipline switch.
Solution:
Patches are reportedly available for the 2.4.x kernel branch.
Grant only trusted users access to vulnerable systems and restrict access to PPP dial-up ports.
Provided and/or discovered by:
Reported by Alan Cox.
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
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