Bug 689822 (CVE-2018-20852) – <dev-lang/python-{2.7.17,3.5.7,3.6.9,3.7.3}: validation flaw in Lib/http/cookiejar.py (CVE-2018-20852)

• Product: Gentoo Security
• Status: RESOLVED FIXED

[Description D'juan McDonald (domhnall) 2019-07-14 07:45:14 UTC]

(https://nvd.nist.gov/vuln/detail/CVE-2018-20852):

http.cookiejar.DefaultPolicy.domain_return_ok in Lib/http/cookiejar.py in Python before 3.7.3 does not correctly validate the domain: it can be tricked into sending existing cookies to the wrong server. An attacker may abuse this flaw by using a server with a hostname that has another valid hostname as a suffix (e.g., pythonicexample.com to steal cookies for example.com). When a program uses http.cookiejar.DefaultPolicy and tries to do an HTTP connection to an attacker-controlled server, existing cookies can be leaked to the attacker. This affects 2.x through 2.7.16, 3.x before 3.4.10, 3.5.x before 3.5.7, 3.6.x before 3.6.9, and 3.7.x before 3.7.3.


Gentoo Security Padawan
(domhnall)

[Comment 1 Michał Górny 2019-07-14 08:04:33 UTC]

[?] dev-lang/python
     Available versions:  
     (2.7)  2.7.15 (~)2.7.16{xpak}
     (3.5)  3.5.5(3.5/3.5m)^t (~)3.5.7(3.5/3.5m)^t{xpak}
     (3.6)  3.6.5(3.6/3.6m)^t (~)3.6.8(3.6/3.6m)^t{xpak}
     (3.7)  (~)3.7.2(3.7/3.7m)^t (~)3.7.3(3.7/3.7m)^t{xpak}

So we need to stabilize new versions of 2.7, 3.5, 3.7 and bump+stabilize 3.6.

[Comment 2 Larry the Git Cow 2019-07-14 13:05:06 UTC]

The bug has been referenced in the following commit(s):

https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=1cd1842cd013485101789106c7b25c8999cff9e9

commit 1cd1842cd013485101789106c7b25c8999cff9e9
Author:     Michał Górny <[e-mail]>
AuthorDate: 2019-07-14 12:46:56 +0000
Commit:     Michał Górny <[e-mail]>
CommitDate: 2019-07-14 12:48:20 +0000

    dev-lang/python: Bump to 3.6.9
    
    Bug: https://bugs.gentoo.org/689822
    Bug: https://bugs.gentoo.org/680246
    Bug: https://bugs.gentoo.org/676700
    Signed-off-by: Michał Górny <[e-mail]>

 dev-lang/python/Manifest            |   1 +
 dev-lang/python/python-3.6.9.ebuild | 349 ++++++++++++++++++++++++++++++++++++
 2 files changed, 350 insertions(+)

[Comment 3 Thomas Deutschmann (RETIRED) 2019-10-26 13:46:46 UTC]

@ maintainer(s): You still need to fix 2.7.x branch (https://github.com/python/cpython/commit/979daae300916adb399ab5b51410b6ebd0888f13) or bump to 2.7.17!

[Comment 4 Thomas Deutschmann (RETIRED) 2019-12-07 01:21:19 UTC]

Let's use this one for stabilization.

@ maintainer(s): Please call for stabilization!

[Comment 5 Michał Górny 2020-01-03 08:31:03 UTC]

All affected versions should be gone now.

[Comment 6 Thomas Deutschmann (RETIRED) 2020-03-15 15:43:29 UTC]

New GLSA request filed.

[Comment 7 GLSAMaker/CVETool Bot 2020-03-15 15:59:17 UTC]

This issue was resolved and addressed in
 GLSA 202003-26 at https://security.gentoo.org/glsa/202003-26
by GLSA coordinator Thomas Deutschmann (whissi).