Amazon Linux AMI update for curl



Risk Medium
Patch available YES
Number of vulnerabilities 2
CVE-ID CVE-2021-22876
CVE-2021-22898
CWE-ID CWE-200
CWE-457
Exploitation vector Network
Public exploit N/A
Vulnerable software
 Amazon Linux AMI
Operating systems & Components / Operating system

Vendor Amazon Web Services

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Information disclosure

EUVDB-ID: #VU51821

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-22876

CWE-ID: CWE-200 - Information exposure

Exploit availability: No

Description

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

The vulnerability exists due to libcurl does not strip off user credentials from the URL when automatically populating the Referer: HTTP request header field in outgoing HTTP requests and therefore risks leaking sensitive data to the server that is the target of the second HTTP request.

Mitigation

Update the affected packages:

i686:
    curl-debuginfo-7.61.1-12.98.amzn1.i686
    libcurl-devel-7.61.1-12.98.amzn1.i686
    curl-7.61.1-12.98.amzn1.i686
    libcurl-7.61.1-12.98.amzn1.i686

src:
    curl-7.61.1-12.98.amzn1.src

x86_64:
    curl-debuginfo-7.61.1-12.98.amzn1.x86_64
    libcurl-7.61.1-12.98.amzn1.x86_64
    libcurl-devel-7.61.1-12.98.amzn1.x86_64
    curl-7.61.1-12.98.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

CPE2.3 External links

https://alas.aws.amazon.com/ALAS-2021-1509.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) 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 packages:

i686:
    curl-debuginfo-7.61.1-12.98.amzn1.i686
    libcurl-devel-7.61.1-12.98.amzn1.i686
    curl-7.61.1-12.98.amzn1.i686
    libcurl-7.61.1-12.98.amzn1.i686

src:
    curl-7.61.1-12.98.amzn1.src

x86_64:
    curl-debuginfo-7.61.1-12.98.amzn1.x86_64
    libcurl-7.61.1-12.98.amzn1.x86_64
    libcurl-devel-7.61.1-12.98.amzn1.x86_64
    curl-7.61.1-12.98.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

CPE2.3 External links

https://alas.aws.amazon.com/ALAS-2021-1509.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.



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