Out-of-bounds Write Affecting curl package, versions <7.58.0-2ubuntu3.6


Severity

Recommended
medium

Based on Ubuntu security rating.

Threat Intelligence

EPSS
7.86% (95th percentile)

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  • Snyk IDSNYK-UBUNTU1804-CURL-336324
  • published6 Feb 2019
  • disclosed6 Feb 2019

Introduced: 6 Feb 2019

CVE-2019-3822  (opens in a new tab)
CWE-787  (opens in a new tab)

How to fix?

Upgrade Ubuntu:18.04 curl to version 7.58.0-2ubuntu3.6 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream curl package and not the curl package as distributed by Ubuntu. See How to fix? for Ubuntu:18.04 relevant fixed versions and status.

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.

CVSS Scores

version 3.1