Vulnerabilities > CVE-2017-8786 - Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability in Pcre Pcre2 10.23

047910
CVSS 9.8 - CRITICAL
Attack vector
NETWORK
Attack complexity
LOW
Privileges required
NONE
Confidentiality impact
HIGH
Integrity impact
HIGH
Availability impact
HIGH
network
low complexity
pcre
CWE-119
critical
nessus

Summary

pcre2test.c in PCRE2 10.23 allows remote attackers to cause a denial of service (heap-based buffer overflow) or possibly have unspecified other impact via a crafted regular expression.

Vulnerable Configurations

Part Description Count
Application
Pcre
1

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 familyGentoo Local Security Checks
    NASL idGENTOO_GLSA-201710-09.NASL
    descriptionThe remote host is affected by the vulnerability described in GLSA-201710-09 (PCRE2: Multiple vulnerabilities) Multiple vulnerabilities have been discovered in PCRE2. Please review the referenced CVE identifiers for details. Impact : A remote attacker could possibly execute arbitrary code with the privileges of the process, cause a Denial of Service condition, or have other unspecified impacts. Workaround : There is no known workaround at this time.
    last seen2020-06-01
    modified2020-06-02
    plugin id103727
    published2017-10-09
    reporterThis script is Copyright (C) 2017-2018 Tenable Network Security, Inc.
    sourcehttps://www.tenable.com/plugins/nessus/103727
    titleGLSA-201710-09 : PCRE2: Multiple vulnerabilities
  • NASL familyHuawei Local Security Checks
    NASL idEULEROS_SA-2019-1983.NASL
    descriptionAccording to the version of the pcre2 package installed, the EulerOS installation on the remote host is affected by the following vulnerability : - pcre2test.c in PCRE2 10.23 allows remote attackers to cause a denial of service (heap-based buffer overflow) or possibly have unspecified other impact via a crafted regular expression.(CVE-2017-8786) 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 seen2020-05-08
    modified2019-09-24
    plugin id129177
    published2019-09-24
    reporterThis script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/129177
    titleEulerOS 2.0 SP5 : pcre2 (EulerOS-SA-2019-1983)