CVE-2017-5549

The klsi_105_get_line_state function in drivers/usb/serial/kl5kusb105.c in the Linux kernel before 4.9.5 places uninitialized heap-memory contents into a log entry upon a failure to read the line status, which allows local users to obtain sensitive information by reading the log.

Weakness

Information written to log files can be of a sensitive nature and give valuable guidance to an attacker or expose sensitive user information.

Affected Software

Extended Description

While logging all information may be helpful during development stages, it is important that logging levels be set appropriately before a product ships so that sensitive user data and system information are not accidentally exposed to potential attackers. Different log files may be produced and stored for:

Potential Mitigations

Related Attack Patterns

• https://cwe.mitre.org/data/definitions/215.html

References

• http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=146cc8a17a3b4996f6805ee5c080e7101277c410
• http://www.debian.org/security/2017/dsa-3791
• http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.5
• http://www.openwall.com/lists/oss-security/2017/01/21/3
• http://www.securityfocus.com/bid/95715
• https://bugzilla.redhat.com/show_bug.cgi?id=1416114
• https://github.com/torvalds/linux/commit/146cc8a17a3b4996f6805ee5c080e7101277c410
• https://usn.ubuntu.com/3754-1/
• http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=146cc8a17a3b4996f6805ee5c080e7101277c410
• http://www.debian.org/security/2017/dsa-3791
• http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.5
• http://www.openwall.com/lists/oss-security/2017/01/21/3
• http://www.securityfocus.com/bid/95715
• https://bugzilla.redhat.com/show_bug.cgi?id=1416114
• https://github.com/torvalds/linux/commit/146cc8a17a3b4996f6805ee5c080e7101277c410
• https://usn.ubuntu.com/3754-1/