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Bug 920385 - <net-ftp/proftpd-1.3.8b: terrapin vulnerability
Summary: <net-ftp/proftpd-1.3.8b: terrapin vulnerability
Alias: None
Product: Gentoo Security
Classification: Unclassified
Component: Vulnerabilities (show other bugs)
Hardware: All Linux
: Normal normal (vote)
Assignee: Gentoo Security
Whiteboard: A3 [stable?]
Depends on:
Blocks: CVE-2023-48795
  Show dependency tree
Reported: 2023-12-20 15:08 UTC by Sam James
Modified: 2023-12-20 15:19 UTC (History)
1 user (show)

See Also:
Package list:
Runtime testing required: ---


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Description Sam James archtester Gentoo Infrastructure gentoo-dev Security 2023-12-20 15:08:46 UTC
CVE-2023-48795 (

The SSH transport protocol with certain OpenSSH extensions, found in OpenSSH before 9.6 and other products, allows remote attackers to bypass integrity checks such that some packets are omitted (from the extension negotiation message), and a client and server may consequently end up with a connection for which some security features have been downgraded or disabled, aka a Terrapin attack. This occurs because the SSH Binary Packet Protocol (BPP), implemented by these extensions, mishandles the handshake phase and mishandles use of sequence numbers. For example, there is an effective attack against ChaCha20-Poly1305 (and CBC with Encrypt-then-MAC). The bypass occurs in and (if CBC is used) the MAC algorithms. This also affects Maverick Synergy Java SSH API before 3.1.0-SNAPSHOT, Dropbear through 2022.83, Ssh before 5.1.1 in Erlang/OTP, and PuTTY before 0.80; and there could be effects on Bitvise SSH through 9.31, AsyncSSH through 2.14.1, libssh through 0.10.5, and through 2023-12-17.
Comment 1 Larry the Git Cow gentoo-dev 2023-12-20 15:19:04 UTC
The bug has been referenced in the following commit(s):

commit 9b38a63644a6643c8356ab3720c391f47446dda7
Author:     Sam James <>
AuthorDate: 2023-12-20 15:10:20 +0000
Commit:     Sam James <>
CommitDate: 2023-12-20 15:18:39 +0000

    net-ftp/proftpd: add 1.3.8b
    Signed-off-by: Sam James <>

 net-ftp/proftpd/Manifest              |   1 +
 net-ftp/proftpd/proftpd-1.3.8b.ebuild | 304 ++++++++++++++++++++++++++++++++++
 2 files changed, 305 insertions(+)