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Eagle's Path: March 2020
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< February 2020 Russ Allbery > Eagle's Path May 2020 >

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2020-03-30: pam-krb5 4.9

This is a security release fixing a one-byte buffer overflow when relaying prompts from the underlying Kerberos library. All users of my pam-krb5 module should upgrade as soon as possible. See the security advisory for more information.

There are also a couple more minor security improvements in this release: The module now rejects passwords as long or longer than PAM_MAX_RESP_SIZE (normally 512 octets) since they can be a denial of service attack via the Kerberos string-to-key function, and uses explicit_bzero where available to clear passwords before releasing memory.

Also in this release, use_pkinit is now supported with MIT Kerberos, the Kerberos prompter function returns more accurate error messages, I fixed an edge-case memory leak in pam_chauthtok, and the module/basic test will run properly with a system krb5.conf file that doesn't specify a realm.

You can get the latest release from the pam-krb5 distribution page. I've also uploaded the new version to Debian unstable and patched security releases with only the security fix to Debian stable and oldstable.

2020-03-30 19:34 — Permanent link

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