Vulnerabilities > CVE-2017-12424 - Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability in multiple products
Attack vector
NETWORK Attack complexity
LOW Privileges required
NONE Confidentiality impact
PARTIAL Integrity impact
PARTIAL Availability impact
PARTIAL Summary
In shadow before 4.5, the newusers tool could be made to manipulate internal data structures in ways unintended by the authors. Malformed input may lead to crashes (with a buffer overflow or other memory corruption) or other unspecified behaviors. This crosses a privilege boundary in, for example, certain web-hosting environments in which a Control Panel allows an unprivileged user account to create subaccounts.
Vulnerable Configurations
Common Weakness Enumeration (CWE)
Common Attack Pattern Enumeration and Classification (CAPEC)
- Buffer Overflow via Environment Variables This attack pattern involves causing a buffer overflow through manipulation of environment variables. Once the attacker finds that they can modify an environment variable, they may try to overflow associated buffers. This attack leverages implicit trust often placed in environment variables.
- Overflow Buffers Buffer Overflow attacks target improper or missing bounds checking on buffer operations, typically triggered by input injected by an attacker. As a consequence, an attacker is able to write past the boundaries of allocated buffer regions in memory, causing a program crash or potentially redirection of execution as per the attackers' choice.
- Client-side Injection-induced Buffer Overflow This type of attack exploits a buffer overflow vulnerability in targeted client software through injection of malicious content from a custom-built hostile service.
- Filter Failure through Buffer Overflow In this attack, the idea is to cause an active filter to fail by causing an oversized transaction. An attacker may try to feed overly long input strings to the program in an attempt to overwhelm the filter (by causing a buffer overflow) and hoping that the filter does not fail securely (i.e. the user input is let into the system unfiltered).
- MIME Conversion An attacker exploits a weakness in the MIME conversion routine to cause a buffer overflow and gain control over the mail server machine. The MIME system is designed to allow various different information formats to be interpreted and sent via e-mail. Attack points exist when data are converted to MIME compatible format and back.
Nessus
NASL family SuSE Local Security Checks NASL id SUSE_SU-2017-2947-1.NASL description This update for shadow fixes several issues. This security issue was fixed : - CVE-2017-12424: The newusers tool could have been forced to manipulate internal data structures in ways unintended by the authors. Malformed input may have lead to crashes (with a buffer overflow or other memory corruption) or other unspecified behaviors (bsc#1052261). The update package also includes non-security fixes. See advisory for details. Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. last seen 2020-06-01 modified 2020-06-02 plugin id 104472 published 2017-11-09 reporter This script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/104472 title SUSE SLED12 / SLES12 Security Update : shadow (SUSE-SU-2017:2947-1) NASL family PhotonOS Local Security Checks NASL id PHOTONOS_PHSA-2017-0030_RSYSLOG.NASL description An update of the rsyslog package has been released. last seen 2020-03-17 modified 2019-02-07 plugin id 121726 published 2019-02-07 reporter This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/121726 title Photon OS 1.0: Rsyslog PHSA-2017-0030 NASL family PhotonOS Local Security Checks NASL id PHOTONOS_PHSA-2017-0030_SHADOW.NASL description An update of the shadow package has been released. last seen 2020-03-17 modified 2019-02-07 plugin id 121727 published 2019-02-07 reporter This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/121727 title Photon OS 1.0: Shadow PHSA-2017-0030 NASL family Huawei Local Security Checks NASL id EULEROS_SA-2019-2427.NASL description According to the versions of the shadow-utils package installed, the EulerOS installation on the remote host is affected by the following vulnerabilities : - In shadow before 4.5, the newusers tool could be made to manipulate internal data structures in ways unintended by the authors. Malformed input may lead to crashes (with a buffer overflow or other memory corruption) or other unspecified behaviors. This crosses a privilege boundary in, for example, certain web-hosting environments in which a Control Panel allows an unprivileged user account to create subaccounts.(CVE-2017-12424) - Integer overflow in shadow 4.2.1 allows local users to gain privileges via crafted input to newuidmap.(CVE-2016-6252) Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. last seen 2020-05-08 modified 2019-12-04 plugin id 131581 published 2019-12-04 reporter This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/131581 title EulerOS 2.0 SP2 : shadow-utils (EulerOS-SA-2019-2427) NASL family Gentoo Local Security Checks NASL id GENTOO_GLSA-201710-16.NASL description The remote host is affected by the vulnerability described in GLSA-201710-16 (Shadow: Buffer overflow) Malformed input in the newusers tool may produce crashes and other unspecified behaviors. Impact : A remote attacker could possibly cause a Denial of Service condition or bypass privilege boundaries in some web-hosting environments in which a Control Panel allows an unprivileged user account to create subaccounts. Workaround : There is no known workaround at this time. last seen 2020-06-01 modified 2020-06-02 plugin id 103851 published 2017-10-16 reporter This script is Copyright (C) 2017-2018 Tenable Network Security, Inc. source https://www.tenable.com/plugins/nessus/103851 title GLSA-201710-16 : Shadow: Buffer overflow NASL family PhotonOS Local Security Checks NASL id PHOTONOS_PHSA-2017-0030.NASL description An update of [rsyslog,shadow] packages for PhotonOS has been released. last seen 2019-02-08 modified 2019-02-07 plugin id 111879 published 2018-08-17 reporter Tenable source https://www.tenable.com/plugins/index.php?view=single&id=111879 title Photon OS 1.0: Rsyslog / Shadow PHSA-2017-0030 (deprecated) NASL family Huawei Local Security Checks NASL id EULEROS_SA-2018-1169.NASL description According to the version of the shadow-utils package installed, the EulerOS installation on the remote host is affected by the following vulnerability : - A buffer overflow flaw leading to heap memory corruption was found in the shadow-utils last seen 2020-05-06 modified 2018-06-28 plugin id 110745 published 2018-06-28 reporter This script is Copyright (C) 2018-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/110745 title EulerOS 2.0 SP3 : shadow-utils (EulerOS-SA-2018-1169) NASL family SuSE Local Security Checks NASL id OPENSUSE-2017-1265.NASL description This update for shadow fixes several issues. This security issue was fixed : - CVE-2017-12424: The newusers tool could have been forced to manipulate internal data structures in ways unintended by the authors. Malformed input may have lead to crashes (with a buffer overflow or other memory corruption) or other unspecified behaviors (bsc#1052261). These non-security issues were fixed : - bsc#1023895: Fixed man page to not contain invalid options and also prevent warnings when using these options in certain settings - bsc#980486: Reset user in /var/log/tallylog because of the usage of pam_tally2 This update was imported from the SUSE:SLE-12-SP2:Update update project. last seen 2020-06-05 modified 2017-11-13 plugin id 104523 published 2017-11-13 reporter This script is Copyright (C) 2017-2020 Tenable Network Security, Inc. source https://www.tenable.com/plugins/nessus/104523 title openSUSE Security Update : shadow (openSUSE-2017-1265)
References
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=756630
- https://bugs.launchpad.net/ubuntu/+source/shadow/+bug/1266675
- https://github.com/shadow-maint/shadow/commit/954e3d2e7113e9ac06632aee3c69b8d818cc8952
- https://lists.debian.org/debian-lts-announce/2021/03/msg00020.html
- https://security.gentoo.org/glsa/201710-16