CVE-2021-22925

moderate-risk

Published 2021-08-05

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.

Do I need to act?

0.42% chance of exploitation

EPSS score — low exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 5.3/10 Medium

NETWORK / LOW complexity

Affected Products (20)

Curl

Fedora

Cloud Backup

Clustered Data Ontap

Hci Management Node

Solidfire

Mac Os X

Macos

Affected Vendors

Apple Oracle Siemens Haxx Fedoraproject Netapp Splunk

References (24)

Mailing List http://seclists.org/fulldisclosure/2021/Sep/39

Mailing List http://seclists.org/fulldisclosure/2021/Sep/40

Patch https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf

Third Party Advisory https://cert-portal.siemens.com/productcert/pdf/ssa-484086.pdf

Exploit https://hackerone.com/reports/1223882

Mailing List https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro...

Third Party Advisory https://security.gentoo.org/glsa/202212-01

Third Party Advisory https://security.netapp.com/advisory/ntap-20210902-0003/

Third Party Advisory https://support.apple.com/kb/HT212804

Third Party Advisory https://support.apple.com/kb/HT212805

Patch https://www.oracle.com/security-alerts/cpujan2022.html

Patch https://www.oracle.com/security-alerts/cpuoct2021.html

Mailing List http://seclists.org/fulldisclosure/2021/Sep/39

Mailing List http://seclists.org/fulldisclosure/2021/Sep/40

Patch https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf

Third Party Advisory https://cert-portal.siemens.com/productcert/pdf/ssa-484086.pdf

Exploit https://hackerone.com/reports/1223882

Mailing List https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro...

Third Party Advisory https://security.gentoo.org/glsa/202212-01

Third Party Advisory https://security.netapp.com/advisory/ntap-20210902-0003/

and 4 more references

/ 100

moderate-risk

Severity 21/34 · High

Exploitability 2/34 · Minimal

Exposure 23/34 · High