SB2017100205 - KASLR bypass in Linux kernel
Published: October 2, 2017
Security Bulletin ID
SB2017100205
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Information disclosure
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Information disclosure (CVE-ID: CVE-2017-14954)
The vulnerability allows a local user to obtain potentially sensitive information.
The vulnerability exists due to an error in waitid implementation in kernel/exit.c in the Linux kernel through 4.13.4. A local user can accesses rusage data structures in unintended cases, which allows local users to obtain sensitive information, and bypass the KASLR protection mechanism, via a crafted system call.
Remediation
Install update from vendor's website.
References
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=6c85501f2fabcfc4fc6ed97654...
- https://github.com/torvalds/linux/commit/6c85501f2fabcfc4fc6ed976543d252c4eaf4be9
- https://grsecurity.net/~spender/exploits/wait_for_kaslr_to_be_effective.c
- https://twitter.com/_argp/status/914021130712870912
- https://twitter.com/grsecurity/status/914079864478666753