[krbdev.mit.edu #8959] git commit
"Greg Hudson via RT" <[email protected]>
| Newsgroups | gmane.comp.encryption.kerberos.bugs |
|---|---|
| Message-ID | <[email protected]> |
<URL: https://krbdev.mit.edu/rt/Ticket/Display.html?id=8959 > Add recursion limit for ASN.1 indefinite lengths The libkrb5 ASN.1 decoder supports BER indefinite lengths. It computes the tag length using recursion; the lack of a recursion limit allows an attacker to overrun the stack and cause the process to crash. Reported by Demi Obenour. CVE-2020-28196: In MIT krb5 releases 1.11 and later, an unauthenticated attacker can cause a denial of service for any client or server to which it can send an ASN.1-encoded Kerberos message of sufficient length. (cherry picked from commit 57415dda6cf04e73ffc3723be518eddfae599bfd) https://github.com/krb5/krb5/commit/9239fa1d0124bdf3c78c20eb70873e3af2baabb1 Author: Greg Hudson <[email protected]> Commit: 9239fa1d0124bdf3c78c20eb70873e3af2baabb1 Branch: krb5-1.17 src/lib/krb5/asn.1/asn1_encode.c | 16 +++++++++------- 1 files changed, 9 insertions(+), 7 deletions(-)