[16661] in Kerberos-V5-bugs
[krbdev.mit.edu #8959] git commit
daemon@ATHENA.MIT.EDU (Greg Hudson via RT)
Tue Nov 3 16:55:20 2020
From: "Greg Hudson via RT" <rt@krbdev.mit.edu>
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<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 <ghudson@mit.edu>
Commit: 9239fa1d0124bdf3c78c20eb70873e3af2baabb1
Branch: krb5-1.17
src/lib/krb5/asn.1/asn1_encode.c | 16 +++++++++-------
1 files changed, 9 insertions(+), 7 deletions(-)
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