Multiple vulnerabilities in cURL

Published: 2022-10-26

Risk	Medium
Patch available	YES
Number of vulnerabilities	4
CVE-ID	CVE-2022-42916 CVE-2022-42915 CVE-2022-35260 CVE-2022-32221
CWE-ID	CWE-319 CWE-415 CWE-121 CWE-440
Exploitation vector	Network
Public exploit	N/A
Vulnerable software Subscribe	cURL Client/Desktop applications / Other client software
Vendor	curl.haxx.se

Security Bulletin

This security bulletin contains information about 4 vulnerabilities.

1) Cleartext transmission of sensitive information

EUVDB-ID: #VU68749

Risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-42916

CWE-ID: CWE-319 - Cleartext Transmission of Sensitive Information

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due to an error when parsing URL with IDN characters that get replaced to ASCII counterparts as part of the IDN conversion. A remote attacker can bypass curl's HSTS check and trick it into using unencrypted HTTP protocol.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

cURL: 7.77.0 - 7.85.0

CPE2.3

External links

http://curl.haxx.se/docs/CVE-2022-42916.html

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.

2) Double Free

EUVDB-ID: #VU68748

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-42915

CWE-ID: CWE-415 - Double Free

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error when processing non-200 proxy HTTP responses for the following schemes: dict, gopher, gophers, ldap, ldaps, rtmp, rtmps, telnet. A remote attacker can trigger a double free error by forcing the application into connecting to resources that are not allowed by the configured proxy.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

cURL: 7.77.0 - 7.85.0

CPE2.3

External links

http://curl.haxx.se/docs/CVE-2022-42915.html

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.

3) Stack-based buffer overflow

EUVDB-ID: #VU68747

Risk: Low

CVSSv3.1: 2.9 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-35260

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

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a boundary error when parsing .netrc file. A local user can pass a specially crafted file to the curl, trigger a stack-based buffer overflow and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

cURL: 7.84.0 - 7.85.0

CPE2.3

External links

http://curl.haxx.se/docs/CVE-2022-35260.html

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

4) Expected behavior violation

EUVDB-ID: #VU68746

Risk: Medium

CVSSv3.1: 4.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-32221

CWE-ID: CWE-440 - Expected Behavior Violation

Exploit availability: No

Description

The vulnerability allows a remote attacker to force unexpected application behavior.

The vulnerability exists due to a logic error for a reused handle when processing subsequent HTTP PUT and POST requests. The libcurl can erroneously use the read callback (CURLOPT_READFUNCTION) to ask for data to send, even when the CURLOPT_POSTFIELDS option has been set, if the same handle previously was used to issue a PUT request, which used that callback. As a result, such behavior can influence application flow and force unpredictable outcome.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

cURL: 7.7 - 7.85.0

CPE2.3

External links

http://curl.haxx.se/docs/CVE-2022-32221.html

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.