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CVE-2021-22925

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Date: August 4, 2021

curl supports the `-t` command line option, known as `CURLOPT_TELNETOPTIONS`in libcurl. This rarely used option is used to send variable=content pairs toTELNET servers.Due to flaw in the option parser for sending `NEW_ENV` variables, libcurlcould be made to pass on uninitialized data from a stack based buffer to theserver. Therefore potentially revealing sensitive internal information to theserver using a clear-text network protocol.This could happen because curl did not call and use sscanf() correctly whenparsing the string provided by the application.

Language: C

Severity Score

Related Resources (19)

https://nvd.nist.gov/vuln/detail/CVE-2021-22925
http://seclists.org/fulldisclosure/2021/Sep/40
https://access.redhat.com/security/cve/CVE-2021-22925
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FRUCW2UVNYUDZF72DQLFQR4PJEC6CF7V/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FRUCW2UVNYUDZF72DQLFQR4PJEC6CF7V/
https://security.netapp.com/advisory/ntap-20210902-0003/
https://github.com/curl/curl/commit/894f6ec730597eb243618d33cc84d71add8d6a8a
https://support.apple.com/kb/HT212805
https://security.alpinelinux.org/vuln/CVE-2021-22925
https://support.apple.com/kb/HT212804
http://seclists.org/fulldisclosure/2021/Sep/39
https://www.oracle.com/security-alerts/cpujan2022.html
https://people.canonical.com/~ubuntu-security/cve/CVE-2021-22925
https://security.gentoo.org/glsa/202212-01
https://hackerone.com/reports/1223882
https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf
https://cert-portal.siemens.com/productcert/pdf/ssa-484086.pdf
https://www.oracle.com/security-alerts/cpuoct2021.html
https://www.mend.io/vulnerability-database/CVE-2021-22925

Severity Score

Weakness Type (CWE)

Information Leak / Disclosure

CWE-200

Use of Uninitialized Resource

CWE-908

Top Fix

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): LOW
Integrity (I): NONE
Availability (A): NONE

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): LOW
Authentication (AU): NONE
Confidentiality (C): PARTIAL
Integrity (I): NONE
Availability (A): NONE
Additional information:

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