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Bug 787437 (CVE-2020-27619)

Summary: [Tracker] Lib/test/ CJK codec tests call eval() on content retrieved via HTTP (CVE-2020-27619)
Product: Gentoo Security Reporter: Thomas Deutschmann (RETIRED) <whissi>
Component: VulnerabilitiesAssignee: Gentoo Security <security>
Status: CONFIRMED ---    
Severity: normal Keywords: Tracker
Priority: Normal    
Version: unspecified   
Hardware: All   
OS: Linux   
Package list:
Runtime testing required: ---
Bug Depends on: 774114, 787440, 779841    
Bug Blocks:    

Description Thomas Deutschmann (RETIRED) gentoo-dev 2021-05-01 15:34:11 UTC
CJK codecs tests call eval() on content retrieved via HTTP

By default, the tests are not run with network resources enabled and so the Python test suite is safe.

But if the Python test suite is run explicitly with the “network” resource enabled (-u network or -u all command line option), the CJK codecs tests of the Python test suite run eval() on content received via HTTP from

If an attacker can compromise the server, they gain arbitrary code execution on all buildbots.

If an attacker has control over the network connection of a machine running the Python test suite, they gain arbitrary code execution there.

make testall, make testuniversal and make buildbottest commands are impacted (pass -u all option to the test suite).

The CI of the Python project is impacted (buildbot, Travis CI, GitHub Action, Azure Pipelines).

With the fix, content is still retrieved via HTTP, but the unsafe eval() function is no longer used.

    Disclosure date: 2020-10-05 (Python issue bpo-41944 reported)
    Reported at: 2020-10-05 (email sent to the PSRT list)
    Reported by: Florian Bruhin

Fixed In
    Python 3.6.13 (2021-02-16) fixed by commit e912e94 (branch 3.6) (2020-10-20)
    Python 3.7.10 (2021-02-16) fixed by commit 43e5231 (branch 3.7) (2020-10-20)
    Python 3.8.7 (2020-12-21) fixed by commit 6c6c256 (branch 3.8) (2020-10-06)
    Python 3.9.1 (2020-12-07) fixed by commit b664a1d (branch 3.9) (2020-10-06)

Python issue
[security] Python testsuite calls eval() on content received via HTTP.

    Python issue: bpo-41944
    Creation date: 2020-10-05
    Reporter: Serhiy Storchaka

In Python 3 through 3.9.0, the Lib/test/ CJK codec tests call eval() on content retrieved via HTTP.

    CVE ID: CVE-2020-27619
    Published: 2020-10-22
    CVSS Score: 7.5
Comment 1 NATTkA bot gentoo-dev 2021-07-29 17:22:37 UTC Comment hidden (obsolete)
Comment 2 NATTkA bot gentoo-dev 2021-07-29 17:30:53 UTC Comment hidden (obsolete)
Comment 3 NATTkA bot gentoo-dev 2021-07-29 17:38:50 UTC Comment hidden (obsolete)
Comment 4 NATTkA bot gentoo-dev 2021-07-29 17:46:59 UTC Comment hidden (obsolete)
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Comment 6 NATTkA bot gentoo-dev 2021-07-29 18:11:15 UTC
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