Stack-based buffer overflow in curl (Alpine package)



Published: 2019-02-06
Risk High
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2019-3822
CWE-ID CWE-121
Exploitation vector Network
Public exploit Public exploit code for vulnerability #1 is available.
Vulnerable software
Subscribe 		curl (Alpine package)
Operating systems & Components / Operating system package or component

Vendor Alpine Linux Development Team

Security Bulletin

This security bulletin contains one high risk vulnerability.

1) Stack-based buffer overflow

EUVDB-ID: #VU17456

Risk: High

CVSSv3.1: 9 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2019-3822

CWE-ID: CWE-121 - Stack-based buffer overflow

Exploit availability: No

Description

The vulnerability allows a remote attacker to cause DoS condition or execute arbitrary code on the target system.

The vulnerability exists due to the NT LAN Manager (NTLM) Curl_auth_create_ntlm_type3_message function creates an outgoing NTLM type-3 header and generates the request HTTP header contents based on previously received data. A remote unauthenticated attacker can send very large ‘nt response’ output data, that has been extracted from a previous NTLMv2 header that was provided by a malicious or broken HTTP server, trigger stack-based buffer overflow and cause the service to crash or execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

curl (Alpine package): 7.61.1-r1

CPE2.3 External links

http://git.alpinelinux.org/aports/commit/?id=f8e74ed5d486b34f474038f07979498dba33a6f1
http://git.alpinelinux.org/aports/commit/?id=5ba18f0ca5e2e4f2371cf806a531c993d2b9689b
http://git.alpinelinux.org/aports/commit/?id=d3a946561011a260c6b7a31fa0714a943e38cdfa
http://git.alpinelinux.org/aports/commit/?id=f7cc724b9adaf1c7da74f14c8664294e44e73e99
http://git.alpinelinux.org/aports/commit/?id=9a196002b469339f47b2d93361aced8256aa4dce
http://git.alpinelinux.org/aports/commit/?id=203cb413da1ecf416412c7b7d53213b1c2b22a09


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.



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