CVE-2019-3822

HIGH

Description

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.

References

http://www.securityfocus.com/bid/106950

https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3822

https://cert-portal.siemens.com/productcert/pdf/ssa-436177.pdf

https://curl.haxx.se/docs/CVE-2019-3822.html

https://lists.apache.org/thread.html/[email protected]%3Cdevnull.infra.apache.org%3E

https://security.gentoo.org/glsa/201903-03

https://security.netapp.com/advisory/ntap-20190315-0001/

https://security.netapp.com/advisory/ntap-20190719-0004/

https://support.f5.com/csp/article/K84141449

https://support.f5.com/csp/article/K84141449?utm_source=f5support&utm_medium=RSS

https://usn.ubuntu.com/3882-1/

https://www.debian.org/security/2019/dsa-4386

https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html

https://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html

Details

Source: MITRE

Published: 2019-02-06

Updated: 2019-07-19

Type: CWE-119

Risk Information

CVSS v2.0

Base Score: 7.5

Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P

Impact Score: 6.4

Exploitability Score: 10

Severity: HIGH

CVSS v3.0

Base Score: 9.8

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Impact Score: 5.9

Exploitability Score: 3.9

Severity: CRITICAL