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Bug 1540439 - (CVE-2018-1000028) CVE-2018-1000028 kernel: Improper sorting of GIDs in nfsd can lead to incorrect permissions being applied
CVE-2018-1000028 kernel: Improper sorting of GIDs in nfsd can lead to incorre...
Status: NEW
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
impact=moderate,public=20180122,repor...
: Security
Depends On: 1540442
Blocks:
  Show dependency tree / graph
 
Reported: 2018-01-30 23:58 EST by Sam Fowler
Modified: 2018-08-28 18:33 EDT (History)
29 users (show)

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Fixed In Version: kernel 4.15
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Description Sam Fowler 2018-01-30 23:58:01 EST 
nfsd in the Linux kernel 4.15, does not properly sort gids when rootsquash is enabled. The groups_sort() function is called inside a loop that copies/squashes gids. he net result is that the highest numbered valid gids are replaced with any lower-valued garbage gids, possibly including 0.

This can corrupt group membership, leading to permission denials for the client.

Upstream Patch:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1995266727fa8143897e89b55f5d3c79aa828420
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