Debian update for curl

Published: 2019-02-07 | Updated: 2019-02-11

Risk	High
Patch available	YES
Number of vulnerabilities	3
CVE-ID	CVE-2018-16890 CVE-2019-3822 CVE-2019-3823
CWE-ID	CWE-125 CWE-121
Exploitation vector	Network
Public exploit	Public exploit code for vulnerability #1 is available. Public exploit code for vulnerability #2 is available. Public exploit code for vulnerability #3 is available.
Vulnerable software	curl (Debian package) Operating systems & Components / Operating system package or component
Vendor	Debian

Security Bulletin

This security bulletin contains information about 3 vulnerabilities.

1) Heap out-of-bounds read

EUVDB-ID: #VU17457

Risk: Low

CVSSv4.0: 2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/U:Clear]

CVE-ID: CVE-2018-16890

CWE-ID: CWE-125 - Out-of-bounds read

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information or cause the service to crash.

The vulnerability exists due to a integer overflow in the function handling incoming NTLM type-2 messages (`lib/vauth/ntlm.c:ntlm_decode_type2_target`) does not validate incoming data correctly. A remote attacker on malicious or broken NTLM server can trick the victim into accepting a bad length + offset combination, trigger heap out-of-bounds read error and read contents of memory on the system or cause the service to crash..

Mitigation

Update the affected package to version: 7.52.1-5+deb9u9

Vulnerable software versions

curl (Debian package): 7.52.1-1 - 7.52.1-5

CPE2.3

External links

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

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.

2) Stack-based buffer overflow

EUVDB-ID: #VU17456

Risk: High

CVSSv4.0: 8.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Amber]

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

Update the affected package to version: 7.52.1-5+deb9u9

Vulnerable software versions

curl (Debian package): 7.52.1-1 - 7.52.1-5

CPE2.3

External links

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

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.

3) Heap out-of-bounds read

EUVDB-ID: #VU17458

Risk: Low

CVSSv4.0: 5.5 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/U:Clear]

CVE-ID: CVE-2019-3823

CWE-ID: CWE-125 - Out-of-bounds read

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information or cause the service to crash.

The vulnerability exists due to a heap out-of-bounds read in the code handling the end-of-response for SMTP. If the buffer passed to `smtp_endofresp()` isn't NUL terminated and contains no character ending the parsed number, and `len` is set to 5, then the `strtol()` call reads beyond the allocated buffer. A remote attacker can trigger heap out-of-bounds read error and read contents of memory on the system or cause the service to crash..

Mitigation

Update the affected package to version: 7.52.1-5+deb9u9

Vulnerable software versions

curl (Debian package): 7.52.1-1 - 7.52.1-5

CPE2.3

External links

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

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.