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Test ID:1.3.6.1.4.1.25623.1.0.891675
Category:Debian Local Security Checks
Title:Debian LTS Advisory ([SECURITY] [DLA 1675-1] python-gnupg security update)
Summary:Alexander Kj?ll and Stig Palmquist discovered a vulnerability in;python-gnupg, a wrapper around GNU Privacy Guard. It was possible to;inject data through the passphrase property of the gnupg.GPG.encrypt();and gnupg.GPG.decrypt() functions when symmetric encryption is used.;The supplied passphrase is not validated for newlines, and the library;passes --passphrase-fd=0 to the gpg executable, which expects the;passphrase on the first line of stdin, and the ciphertext to be;decrypted or plaintext to be encrypted on subsequent lines.;;By supplying a passphrase containing a newline an attacker can;control/modify the ciphertext/plaintext being decrypted/encrypted.
Description:Summary:
Alexander Kj?ll and Stig Palmquist discovered a vulnerability in
python-gnupg, a wrapper around GNU Privacy Guard. It was possible to
inject data through the passphrase property of the gnupg.GPG.encrypt()
and gnupg.GPG.decrypt() functions when symmetric encryption is used.
The supplied passphrase is not validated for newlines, and the library
passes --passphrase-fd=0 to the gpg executable, which expects the
passphrase on the first line of stdin, and the ciphertext to be
decrypted or plaintext to be encrypted on subsequent lines.

By supplying a passphrase containing a newline an attacker can
control/modify the ciphertext/plaintext being decrypted/encrypted.

Affected Software/OS:
python-gnupg on Debian Linux

Solution:
For Debian 8 'Jessie', this problem has been fixed in version
0.3.6-1+deb8u1.

We recommend that you upgrade your python-gnupg packages.

CVSS Score:
5.0

CVSS Vector:
AV:N/AC:L/Au:N/C:P/I:N/A:N

Cross-Ref: Common Vulnerability Exposure (CVE) ID: CVE-2019-6690
BugTraq ID: 106756
http://www.securityfocus.com/bid/106756
Bugtraq: 20190125 CVE-2019-6690: Improper Input Validation in python-gnupg (Google Search)
https://seclists.org/bugtraq/2019/Jan/41
http://packetstormsecurity.com/files/151341/Python-GnuPG-0.4.3-Improper-Input-Validation.html
https://pypi.org/project/python-gnupg/#history
https://lists.debian.org/debian-lts-announce/2019/02/msg00021.html
SuSE Security Announcement: SU-2019:0143-1 (Google Search)
http://lists.opensuse.org/opensuse-security-announce/2019-02/msg00008.html
SuSE Security Announcement: SUSE-SU-2019:0239-1 (Google Search)
http://lists.opensuse.org/opensuse-security-announce/2019-02/msg00058.html
CopyrightCopyright (C) 2019 Greenbone Networks GmbH

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