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CVE-2019-3822

Status Candidate

Overview

libcurl versions from 7.36.0 to before 7.64.0 are vulnerable to a stack-based buffer overflow. The function creating an outgoing NTLM type-3 header (`lib/vauth/ntlm.c:Curl_auth_create_ntlm_type3_message()`), generates the request HTTP header contents based on previously received data. The check that exists to prevent the local buffer from getting overflowed is implemented wrongly (using unsigned math) and as such it does not prevent the overflow from happening. This output data can grow larger than the local buffer if very large 'nt response' data is extracted from a previous NTLMv2 header provided by the malicious or broken HTTP server. Such a 'large value' needs to be around 1000 bytes or more. The actual payload data copied to the target buffer comes from the NTLMv2 type-2 response header.

Related Files

Red Hat Security Advisory 2019-3701-01
Posted Nov 6, 2019
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2019-3701-01 - The curl packages provide the libcurl library and the curl utility for downloading files from servers using various protocols, including HTTP, FTP, and LDAP. Issues addressed include a buffer overflow vulnerability.

tags | advisory, web, overflow, protocol
systems | linux, redhat
advisories | CVE-2018-16890, CVE-2018-20483, CVE-2019-3822, CVE-2019-3823
MD5 | 455709ca8c7afa5600951eaadbe8896d
Gentoo Linux Security Advisory 201903-03
Posted Mar 11, 2019
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 201903-3 - Multiple vulnerabilities have been found in cURL, the worst of which could result in a Denial of Service condition. Versions less than 7.64.0 are affected.

tags | advisory, denial of service, vulnerability
systems | linux, gentoo
advisories | CVE-2018-14618, CVE-2018-16839, CVE-2018-16840, CVE-2018-16842, CVE-2019-3822, CVE-2019-3823
MD5 | 2f866be211b86ff71d0279d185e7082f
Slackware Security Advisory - curl Updates
Posted Feb 7, 2019
Authored by Slackware Security Team | Site slackware.com

Slackware Security Advisory - New curl packages are available for Slackware 14.0, 14.1, 14.2, and -current to fix security issues.

tags | advisory
systems | linux, slackware
advisories | CVE-2018-16890, CVE-2019-3822, CVE-2019-3823
MD5 | 94a3f99ebf000e845519b576af5096b3
Debian Security Advisory 4386-1
Posted Feb 7, 2019
Authored by Debian | Site debian.org

Debian Linux Security Advisory 4386-1 - Multiple vulnerabilities were discovered in cURL, an URL transfer library.

tags | advisory, vulnerability
systems | linux, debian
advisories | CVE-2018-16890, CVE-2019-3822, CVE-2019-3823
MD5 | 0b5291ca75b37da8828dd930b9951035
Ubuntu Security Notice USN-3882-1
Posted Feb 6, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3882-1 - Wenxiang Qian discovered that curl incorrectly handled certain NTLM authentication messages. A remote attacker could possibly use this issue to cause curl to crash, resulting in a denial of service. This issue only applied to Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 18.10. Wenxiang Qian discovered that curl incorrectly handled certain NTLMv2 authentication messages. A remote attacker could use this issue to cause curl to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only applied to Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 18.10. Various other issues were also addressed.

tags | advisory, remote, denial of service, arbitrary
systems | linux, ubuntu
advisories | CVE-2018-16890, CVE-2019-3822, CVE-2019-3823
MD5 | 0f925b1c5398dda61353888f8f8f00b0
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