Stack-based Buffer Overflow Affecting curl package, versions <0:7.61.1-11.el8


Severity

Recommended
0.0
medium
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
19.21% (97th percentile)

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  • Snyk IDSNYK-RHEL8-CURL-3547201
  • published26 Jul 2021
  • disclosed6 Feb 2019

Introduced: 6 Feb 2019

CVE-2019-3822  (opens in a new tab)
CWE-121  (opens in a new tab)

How to fix?

Upgrade RHEL:8 curl to version 0:7.61.1-11.el8 or higher.
This issue was patched in RHSA-2019:3701.

NVD Description

Note: Versions mentioned in the description apply only to the upstream curl package and not the curl package as distributed by RHEL. See How to fix? for RHEL:8 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