Bug 1528335 - (CVE-2017-17807) CVE-2017-17807 kernel: Missing permissions check for request_key() destination allows local attackers to add keys to keyring without Write permission
CVE-2017-17807 kernel: Missing permissions check for request_key() destinatio...
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=20171208,repor...
: Security
Depends On: 1528346 1543261 1543262 1543263 1543264 1543265 1528337
Blocks: 1528348
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Reported: 2017-12-21 10:10 EST by Adam Mariš
Modified: 2018-02-22 08:47 EST (History)
49 users (show)

See Also:
Fixed In Version: kernel 14.4.6
Doc Type: If docs needed, set a value
Doc Text:
The KEYS subsystem in the Linux kernel omitted an access-control check when writing a key to the current task's default keyring, allowing a local user to bypass security checks to the keyring. This compromises the validity of the keyring for those who rely on it.
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Description Adam Mariš 2017-12-21 10:10:40 EST
The KEYS subsystem in the Linux kernel omitted an access-control check when adding a key to the current task's "default request-key keyring" via the request_key() system call, allowing a local user to use a sequence of crafted system calls to add keys to a keyring with only Search permission (not Write permission) to that keyring, related to construct_get_dest_keyring() in security/keys/request_key.c.

Upstream patch:

https://github.com/torvalds/linux/commit/4dca6ea1d9432052afb06baf2e3ae78188a4410b
Comment 1 Adam Mariš 2017-12-21 10:13:15 EST
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1528337]
Comment 3 Justin M. Forbes 2018-01-29 12:57:03 EST
This was fixed for Fedora with the 4.14.6 stable updates.
Comment 10 Vladis Dronov 2018-02-22 08:47:50 EST
Statement:

This issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 5. This is not currently planned to be addressed in future updates of the product due to its life cycle. For additional information, refer to the Red Hat Enterprise Linux Life Cycle: https://access.redhat.com/support/policy/updates/errata/.

This issue affects the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 6, 7, its real-time kernel, Red Hat Enterprise MRG 2, Red Hat Enterprise Linux 7 for ARM 64 and Red Hat Enterprise Linux 7 for Power 9 LE. Future Linux kernel updates for the respective releases may address this issue.

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