Ubuntu update for curl

Published: 2022-01-20

Risk	Medium
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2021-22898 CVE-2021-22925
CWE-ID	CWE-457
Exploitation vector	Network
Public exploit	N/A
Vulnerable software	Ubuntu Operating systems & Components / Operating system libcurl3-nss (Ubuntu package) Operating systems & Components / Operating system package or component libcurl3-gnutls (Ubuntu package) Operating systems & Components / Operating system package or component libcurl3 (Ubuntu package) Operating systems & Components / Operating system package or component curl (Ubuntu package) Operating systems & Components / Operating system package or component
Vendor	Canonical Ltd.

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Use of uninitialized variable

EUVDB-ID: #VU53587

Risk: Medium

CVSSv4.0: 1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-22898

CWE-ID: CWE-457 - Use of Uninitialized Variable

Exploit availability: No

Description

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

The vulnerability exists due to usage of uninitialized variable in code, responsible for processing TELNET requests when parsing NEW_ENV variables. A remote attacker can force the affected application to connect to a telnet server under attackers control and read up to 1800 bytes from the uninitialized memory on the libcurl client system.

Proof of concept:

curl telnet://example.com -tNEW_ENV=a,bbbbbb (256 'b's)

Mitigation

Update the affected package curl to the latest version.

Vulnerable software versions

Ubuntu: 16.04

libcurl3-nss (Ubuntu package): before 7.47.01u buntu2.19+esm3

libcurl3-gnutls (Ubuntu package): before 7.47.01u buntu2.19+esm3

libcurl3 (Ubuntu package): before 7.47.01u buntu2.19+esm3

curl (Ubuntu package): before 7.47.01u buntu2.19+esm3

CPE2.3

External links

https://ubuntu.com/security/notices/USN-5021-2

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) Use of Uninitialized Variable

EUVDB-ID: #VU55149