Vulnerabilities > CVE-2016-1982 - Improper Input Validation vulnerability in Privoxy

047910
CVSS 5.0 - MEDIUM
Attack vector
NETWORK
Attack complexity
LOW
Privileges required
NONE
Confidentiality impact
NONE
Integrity impact
NONE
Availability impact
PARTIAL
network
low complexity
privoxy
CWE-20
nessus

Summary

The remove_chunked_transfer_coding function in filters.c in Privoxy before 3.0.24 allows remote attackers to cause a denial of service (invalid read and crash) via crafted chunk-encoded content.

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 familyAmazon Linux Local Security Checks
    NASL idALA_ALAS-2016-663.NASL
    descriptionThe remove_chunked_transfer_coding function allows remote attackers to cause a denial of service (invalid read and crash) via crafted chunk-encoded content. (CVE-2016-1982) The client_host function in parsers.c allows remote attackers to cause a denial of service (invalid read and crash) via an empty HTTP Host header. (CVE-2016-1983)
    last seen2020-06-01
    modified2020-06-02
    plugin id89844
    published2016-03-11
    reporterThis script is Copyright (C) 2016-2018 Tenable Network Security, Inc.
    sourcehttps://www.tenable.com/plugins/nessus/89844
    titleAmazon Linux AMI : privoxy (ALAS-2016-663)
  • NASL familyDebian Local Security Checks
    NASL idDEBIAN_DLA-398.NASL
    descriptionCVE-2016-1982 Prevent invalid reads in case of corrupt chunk-encoded content CVE-2016-1983 Remove empty Host headers in client requests; resulting in invalid reads. NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen2020-03-17
    modified2016-01-25
    plugin id88105
    published2016-01-25
    reporterThis script is Copyright (C) 2016-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/88105
    titleDebian DLA-398-1 : privoxy security update
  • NASL familyDebian Local Security Checks
    NASL idDEBIAN_DSA-3460.NASL
    descriptionIt was discovered that privoxy, a web proxy with advanced filtering capabilities, contained invalid reads that could enable a remote attacker to crash the application, thus causing a Denial of Service.
    last seen2020-06-01
    modified2020-06-02
    plugin id88495
    published2016-02-01
    reporterThis script is Copyright (C) 2016-2018 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/88495
    titleDebian DSA-3460-1 : privoxy - security update
  • NASL familyFedora Local Security Checks
    NASL idFEDORA_2016-29995FBD42.NASL
    descriptionPatches for CVE-2016-1982,3 Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen2020-06-05
    modified2016-03-04
    plugin id89500
    published2016-03-04
    reporterThis script is Copyright (C) 2016-2020 Tenable Network Security, Inc.
    sourcehttps://www.tenable.com/plugins/nessus/89500
    titleFedora 23 : privoxy-3.0.23-3.fc23 (2016-29995fbd42)
  • NASL familyFreeBSD Local Security Checks
    NASL idFREEBSD_PKG_A763A0E7C3D911E5B5FE002590263BF5.NASL
    descriptionPrivoxy Developers reports : Prevent invalid reads in case of corrupt chunk-encoded content. CVE-2016-1982. Bug discovered with afl-fuzz and AddressSanitizer. Remove empty Host headers in client requests. Previously they would result in invalid reads. CVE-2016-1983. Bug discovered with afl-fuzz and AddressSanitizer.
    last seen2020-06-01
    modified2020-06-02
    plugin id88151
    published2016-01-26
    reporterThis script is Copyright (C) 2016-2018 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/88151
    titleFreeBSD : privoxy -- multiple vulnerabilities (a763a0e7-c3d9-11e5-b5fe-002590263bf5)
  • NASL familyFedora Local Security Checks
    NASL idFEDORA_2016-BC7ACD24C6.NASL
    descriptionPatches for CVE-2016-1982,3 Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen2020-06-05
    modified2016-03-04
    plugin id89604
    published2016-03-04
    reporterThis script is Copyright (C) 2016-2020 Tenable Network Security, Inc.
    sourcehttps://www.tenable.com/plugins/nessus/89604
    titleFedora 22 : privoxy-3.0.23-3.fc22 (2016-bc7acd24c6)
  • NASL familySuSE Local Security Checks
    NASL idOPENSUSE-2016-130.NASL
    descriptionThis update to Privoxy 3.0.24 fixes two minor security issues. The vulnerabilities should not be exploitable in the binary as compiled in openSUSE. - CVE-2016-1982: Corrupt chunk-encoded content could cause an invalid read (boo#963151) - CVE-2016-1983: Empty Host headers in client requests could result in invalid reads (boo#963152) This update also contains general bug fixes and improvements as well as white and blacklist updates.
    last seen2020-06-05
    modified2016-02-03
    plugin id88551
    published2016-02-03
    reporterThis script is Copyright (C) 2016-2020 Tenable Network Security, Inc.
    sourcehttps://www.tenable.com/plugins/nessus/88551
    titleopenSUSE Security Update : privoxy (openSUSE-2016-130)
  • NASL familySuSE Local Security Checks
    NASL idOPENSUSE-2016-132.NASL
    descriptionThis update to Privoxy 3.0.24 fixes two minor security issues. The vulnerabilities should not be exploitable in the binary as compiled in openSUSE. - CVE-2016-1982: Corrupt chunk-encoded content could cause an invalid read (boo#963151) - CVE-2016-1983: Empty Host headers in client requests could result in invalid reads (boo#963152) This update also contains general bug fixes and improvements as well as white and blacklist updates.
    last seen2020-06-05
    modified2016-02-03
    plugin id88553
    published2016-02-03
    reporterThis script is Copyright (C) 2016-2020 Tenable Network Security, Inc.
    sourcehttps://www.tenable.com/plugins/nessus/88553
    titleopenSUSE Security Update : Privoxy (openSUSE-2016-132)