hmac-* are Message authentication code algorithms (MACs), so you have to configure your Message authentication code algorithms (MACs) supported, for example
MACs hmac-sha2-256,hmac-sha2-512 see https://www.ssh.com/ssh/sshd_config/#common-configuration-changes-for-the-enterprise El mié, 10 feb 2021 a las 17:24, Eric Fetzer (<[email protected]>) escribió: > Hmmm, I already hardened by that link: > https://www.ssh.com/ssh/sshd_config > > My /etc/ssh/sshd_config has: > > Ciphers aes128-ctr,aes192-ctr,aes256-ctr > > This is still showing up on my security scan though. Am I missing > something? > > Thanks, > Eric > > On Tue, Feb 9, 2021 at 12:23 PM kuisathaverat <[email protected]> > wrote: > >> There is work in progress to bump the version of the library and convert >> the sshd-module in a plugin to resolve this kind of issues quickly. For the >> moment you can configure your sshd servers on the Agents side to do not >> allow weak ciphers, see https://www.ssh.com/ssh/sshd_config. >> >> https://github.com/jenkinsci/sshd-module/pull/37 >> https://github.com/jenkinsci/sshd-module/pull/38 >> >> >> El mar, 9 feb 2021 a las 17:19, [email protected] (< >> [email protected]>) escribió: >> >>> I'm sorry, I just saw the last comment on here and, once again, this >>> showed up on our vulnerability report. I don't get exactly what I need to >>> do in order to fix this. Can someone lay it out for me please? Thanks - >>> Eric >>> >>> On Wednesday, August 26, 2020 at 12:39:40 PM UTC-6 [email protected] >>> wrote: >>> >>>> I was wrong you cannot configure the ciphers for the ssh server on the >>>> Java security files. The SSH server on Jenkins uses the >>>> https://github.com/apache/mina-sshd , IIRC the Jenkins implementation >>>> of the ssh server not read the sshd_config files so it is not posible to >>>> configure the ssh server. Apache mina has deprecated and disable those >>>> algorithms on 2.6.0 https://issues.apache.org/jira/browse/SSHD-1004, >>>> the sshd-module and CLI are using 1.7.0 >>>> https://github.com/jenkinsci/sshd-module/blob/master/pom.xml#L42 and >>>> https://github.com/jenkinsci/jenkins/blob/master/cli/pom.xml#L77 So I >>>> guess both should bump the dependency to remove support for weak algorithms >>>> >>>> >>>> El miércoles, 26 de agosto de 2020 a las 16:06:22 UTC+2, >>>> [email protected] escribió: >>>> >>>>> I think I found the solution to this: >>>>> >>>>> >>>>> https://www.thegeekdiary.com/how-to-disable-md5-based-hmac-algorithms-for-ssh/ >>>>> >>>>> >>>>> On Tuesday, August 25, 2020 at 1:59:49 PM UTC-6 [email protected] >>>>> wrote: >>>>> >>>>>> I'm confused. It doesn't look like the ciphers the vulnerability is >>>>>> citing are allowed in the java.security file on this system. We're >>>>>> getting >>>>>> flagged for: >>>>>> >>>>>> hmac-md5 >>>>>> hmac-md5-96 >>>>>> hmac-sha1-96 >>>>>> >>>>>> Settings are: >>>>>> >>>>>> jdk.tls.disabledAlgorithms=SSLv3, RC4, DES, MD5withRSA, DH keySize < >>>>>> 1024, \ >>>>>> EC keySize < 224, 3DES_EDE_CBC, anon, NULL >>>>>> >>>>>> Am I missing this, not a java security expert by any means... Thanks! >>>>>> On Monday, August 24, 2020 at 11:09:43 AM UTC-6 [email protected] >>>>>> wrote: >>>>>> >>>>>>> Yes, configuring the ciphers accepted by your JDK edit the >>>>>>> file lib\security\java.security (the path will vary based on your Java >>>>>>> version) >>>>>>> >>>>>>> El lunes, 24 de agosto de 2020 a las 16:48:22 UTC+2, >>>>>>> [email protected] escribió: >>>>>>> >>>>>>>> Hi all! I'm getting hit by my secuity team for a vulnerability for >>>>>>>> the Jenkins CLI via ssh allowing the following weak ciphers: >>>>>>>> >>>>>>>> hmac-md5 >>>>>>>> hmac-md5-96 >>>>>>>> hmac-sha1-96 >>>>>>>> >>>>>>>> Is there a way to configure ciphers accepted for the Jenkins CLI? >>>>>>>> >>>>>>>> Thanks, >>>>>>>> Eric >>>>>>>> >>>>>>> -- >>> You received this message because you are subscribed to a topic in the >>> Google Groups "Jenkins Users" group. >>> To unsubscribe from this topic, visit >>> https://groups.google.com/d/topic/jenkinsci-users/f84HCfhF4vY/unsubscribe >>> . >>> To unsubscribe from this group and all its topics, send an email to >>> [email protected]. >>> To view this discussion on the web visit >>> https://groups.google.com/d/msgid/jenkinsci-users/07db750a-9c00-40ee-bc68-0a2b051c48fdn%40googlegroups.com >>> <https://groups.google.com/d/msgid/jenkinsci-users/07db750a-9c00-40ee-bc68-0a2b051c48fdn%40googlegroups.com?utm_medium=email&utm_source=footer> >>> . >>> >> >> >> -- >> Un Saludo >> Iván Fernández Calvo >> https://www.linkedin.com/in/iv%C3%A1n-fern%C3%A1ndez-calvo-21425033 >> >> -- >> You received this message because you are subscribed to a topic in the >> Google Groups "Jenkins Users" group. >> To unsubscribe from this topic, visit >> https://groups.google.com/d/topic/jenkinsci-users/f84HCfhF4vY/unsubscribe >> . >> To unsubscribe from this group and all its topics, send an email to >> [email protected]. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/jenkinsci-users/CAKo5QrruVhwNoAi_XfMoFmHf_iwg-wPVBM%2BiwyRajRuyvmrbeQ%40mail.gmail.com >> <https://groups.google.com/d/msgid/jenkinsci-users/CAKo5QrruVhwNoAi_XfMoFmHf_iwg-wPVBM%2BiwyRajRuyvmrbeQ%40mail.gmail.com?utm_medium=email&utm_source=footer> >> . >> > -- > You received this message because you are subscribed to a topic in the > Google Groups "Jenkins Users" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/jenkinsci-users/f84HCfhF4vY/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/jenkinsci-users/CAByBicY8swNixDjYvy0_VkiRWZKs_wrw6QFm0jxOVFR1rEx%3DKw%40mail.gmail.com > <https://groups.google.com/d/msgid/jenkinsci-users/CAByBicY8swNixDjYvy0_VkiRWZKs_wrw6QFm0jxOVFR1rEx%3DKw%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > -- Un Saludo Iván Fernández Calvo https://www.linkedin.com/in/iv%C3%A1n-fern%C3%A1ndez-calvo-21425033 -- You received this message because you are subscribed to the Google Groups "Jenkins Users" group. 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