NULL Pointer Dereference Affecting zsh package, versions <0:5.3.1-7.amzn2
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-AMZN2-ZSH-1661275
- published27 Sept 2021
- disclosed27 Feb 2018
Introduced: 27 Feb 2018
CVE-2018-7548 (opens in a new tab)How to fix?
Upgrade Amazon-Linux:2 zsh to version 0:5.3.1-7.amzn2 or higher.
This issue was patched in ALAS2-2018-986.
NVD Description
Note: Versions mentioned in the description apply only to the upstream zsh package and not the zsh package as distributed by Amazon-Linux.
See How to fix? for Amazon-Linux:2 relevant fixed versions and status.
In subst.c in zsh through 5.4.2, there is a NULL pointer dereference when using ${(PA)...} on an empty array result.