Vulnerabilities > CVE-2018-19591 - Improper Input Validation vulnerability in multiple products
Attack vector
NETWORK Attack complexity
LOW Privileges required
NONE Confidentiality impact
NONE Integrity impact
NONE Availability impact
HIGH Summary
In the GNU C Library (aka glibc or libc6) through 2.28, attempting to resolve a crafted hostname via getaddrinfo() leads to the allocation of a socket descriptor that is not closed. This is related to the if_nametoindex() function.
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.
- Server Side Include (SSI) Injection An attacker can use Server Side Include (SSI) Injection to send code to a web application that then gets executed by the web server. Doing so enables the attacker to achieve similar results to Cross Site Scripting, viz., arbitrary code execution and information disclosure, albeit on a more limited scale, since the SSI directives are nowhere near as powerful as a full-fledged scripting language. Nonetheless, the attacker can conveniently gain access to sensitive files, such as password files, and execute shell commands.
- Cross Zone Scripting An attacker is able to cause a victim to load content into their web-browser that bypasses security zone controls and gain access to increased privileges to execute scripting code or other web objects such as unsigned ActiveX controls or applets. This is a privilege elevation attack targeted at zone-based web-browser security. In a zone-based model, pages belong to one of a set of zones corresponding to the level of privilege assigned to that page. Pages in an untrusted zone would have a lesser level of access to the system and/or be restricted in the types of executable content it was allowed to invoke. In a cross-zone scripting attack, a page that should be assigned to a less privileged zone is granted the privileges of a more trusted zone. This can be accomplished by exploiting bugs in the browser, exploiting incorrect configuration in the zone controls, through a cross-site scripting attack that causes the attackers' content to be treated as coming from a more trusted page, or by leveraging some piece of system functionality that is accessible from both the trusted and less trusted zone. This attack differs from "Restful Privilege Escalation" in that the latter correlates to the inadequate securing of RESTful access methods (such as HTTP DELETE) on the server, while cross-zone scripting attacks the concept of security zones as implemented by a browser.
- Cross Site Scripting through Log Files An attacker may leverage a system weakness where logs are susceptible to log injection to insert scripts into the system's logs. If these logs are later viewed by an administrator through a thin administrative interface and the log data is not properly HTML encoded before being written to the page, the attackers' scripts stored in the log will be executed in the administrative interface with potentially serious consequences. This attack pattern is really a combination of two other attack patterns: log injection and stored cross site scripting.
- Command Line Execution through SQL Injection An attacker uses standard SQL injection methods to inject data into the command line for execution. This could be done directly through misuse of directives such as MSSQL_xp_cmdshell or indirectly through injection of data into the database that would be interpreted as shell commands. Sometime later, an unscrupulous backend application (or could be part of the functionality of the same application) fetches the injected data stored in the database and uses this data as command line arguments without performing proper validation. The malicious data escapes that data plane by spawning new commands to be executed on the host.
Nessus
NASL family Fedora Local Security Checks NASL id FEDORA_2018-060302DC83.NASL description This update for the `glibc` package addresses one moderate security vulnerability and several defects. - CVE-2018-19591: A file descriptor leak in `if_nametoindex` can lead to a denial of service due to resource exhaustion when processing `getaddrinfo` calls with crafted host names. Reported by Guido Vranken. (RHBZ#1654000) - Failure to create the helper thread for `getaddrinfo_a`/`libanl` could result in a crash. (RHBZ#1646381) - On certain Haswell-class Intel CPUs, string function feature flags could be set incorrectly, leading to a suboptimal choice of string functions. (RHBZ#1641980) - Parallel building of locales led to nondeterminism in the RPM build process. (RHBZ#1652228) - Various minor bug fixes from the upstream 2.27 release branch were imported as part of this update ([swbz#17630](https://sourceware.org/bugzilla/show_bug.c gi?id=17630), [swbz#22753](https://sourceware.org/bugzilla/show_bug.cg i?id=22753), [swbz#23275](https://sourceware.org/bugzilla/show_bug.cg i?id=23275), [swbz#23562](https://sourceware.org/bugzilla/show_bug.cg i?id=23562), [swbz#23579](https://sourceware.org/bugzilla/show_bug.cg i?id=23579), [swbz#23822](https://sourceware.org/bugzilla/show_bug.cg i?id=23822)). Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. last seen 2020-06-05 modified 2019-01-03 plugin id 120212 published 2019-01-03 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/120212 title Fedora 28 : glibc (2018-060302dc83) NASL family Gentoo Local Security Checks NASL id GENTOO_GLSA-201903-09.NASL description The remote host is affected by the vulnerability described in GLSA-201903-09 (GNU C Library: Arbitrary descriptor allocation) A vulnerability was discovered in the GNU C Library functions xdr_bytes and xdr_string. Impact : A remote attacker, by sending a crafted UDP packet, could cause a Denial of Service condition. Workaround : There is no known workaround at this time. last seen 2020-06-01 modified 2020-06-02 plugin id 122831 published 2019-03-14 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/122831 title GLSA-201903-09 : GNU C Library: Arbitrary descriptor allocation NASL family PhotonOS Local Security Checks NASL id PHOTONOS_PHSA-2019-2_0-0134_GLIBC.NASL description An update of the glibc package has been released. last seen 2020-06-01 modified 2020-06-02 plugin id 122915 published 2019-03-18 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/122915 title Photon OS 2.0: Glibc PHSA-2019-2.0-0134 NASL family Gentoo Local Security Checks NASL id GENTOO_GLSA-201908-06.NASL description The remote host is affected by the vulnerability described in GLSA-201908-06 (glibc: Multiple vulnerabilities) Multiple vulnerabilities have been discovered in glibc. Please review the CVE identifiers referenced below for details. Impact : Please review the referenced CVE identifiers for details. Workaround : There is no known workaround at this time. last seen 2020-06-01 modified 2020-06-02 plugin id 127955 published 2019-08-20 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/127955 title GLSA-201908-06 : glibc: Multiple vulnerabilities NASL family Fedora Local Security Checks NASL id FEDORA_2018-F6B7DF660D.NASL description This update for the `glibc` package addresses one moderate security vulnerability and a minor defect : - CVE-2018-19591: A file descriptor leak in `if_nametoindex` can lead to a denial of service due to resource exhaustion when processing `getaddrinfo` calls with crafted host names. Reported by Guido Vranken. (RHBZ#1654000) - Parallel building of locales led to nondeterminism in the RPM build process. (RHBZ#1652228) Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. last seen 2020-06-05 modified 2019-01-03 plugin id 120918 published 2019-01-03 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/120918 title Fedora 29 : glibc (2018-f6b7df660d) NASL family PhotonOS Local Security Checks NASL id PHOTONOS_PHSA-2019-1_0-0209_GLIBC.NASL description An update of the glibc package has been released. last seen 2020-06-01 modified 2020-06-02 plugin id 133298 published 2020-01-28 reporter This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/133298 title Photon OS 1.0: Glibc PHSA-2019-1.0-0209 NASL family Amazon Linux Local Security Checks NASL id AL2_ALAS-2019-1140.NASL description In the GNU C Library (aka glibc or libc6) through 2.28, attempting to resolve a crafted hostname via getaddrinfo() leads to the allocation of a socket descriptor that is not closed. This is related to the if_nametoindex() function.(CVE-2018-19591) last seen 2020-03-17 modified 2019-01-10 plugin id 121049 published 2019-01-10 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/121049 title Amazon Linux 2 : glibc (ALAS-2019-1140)
References
- https://sourceware.org/bugzilla/show_bug.cgi?id=23927
- http://www.securitytracker.com/id/1042174
- http://www.securityfocus.com/bid/106037
- https://security.gentoo.org/glsa/201903-09
- https://security.netapp.com/advisory/ntap-20190321-0003/
- https://security.gentoo.org/glsa/201908-06
- https://usn.ubuntu.com/4416-1/
- https://sourceware.org/git/?p=glibc.git%3Ba=blob_plain%3Bf=NEWS%3Bhb=HEAD
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BO7WHN52GFMC5F2I2232GFIPSSXWFV7G/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/M52KE4YR3GNMHQUOS3DKAGZD5TQ5D5UH/
- https://sourceware.org/git/gitweb.cgi?p=glibc.git%3Ba=commitdiff%3Bh=d527c860f5a3f0ed687bd03f0cb464612dc23408