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Amazon Linux AMI: CVE-2017-16997: Security patch for glibc (ALAS-2018-1109)

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Amazon Linux AMI: CVE-2017-16997: Security patch for glibc (ALAS-2018-1109)

Severity
9
CVSS
(AV:N/AC:M/Au:N/C:C/I:C/A:C)
Published
12/17/2017
Created
03/19/2019
Added
12/07/2018
Modified
05/03/2019

Description

elf/dl-load.c in the GNU C Library (aka glibc or libc6) 2.19 through 2.26 mishandles RPATH and RUNPATH containing $ORIGIN for a privileged (setuid or AT_SECURE) program, which allows local users to gain privileges via a Trojan horse library in the current working directory, related to the fillin_rpath and decompose_rpath functions. This is associated with misinterpretion of an empty RPATH/RUNPATH token as the "./" directory. NOTE: this configuration of RPATH/RUNPATH for a privileged program is apparently very uncommon; most likely, no such program is shipped with any common Linux distribution.

Solution(s)

  • amazon-linux-upgrade-glibc

References

  • amazon-linux-upgrade-glibc

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