Fedora 35: FEDORA-2022-8eb95d8611 Critical: Race Condition in Paramiko

Paramiko (a combination of the Esperanto words for "paranoid" and "friend") is

a module for python 2.3 or greater that implements the SSH2 protocol for secure

(encrypted and authenticated) connections to remote machines. Unlike SSL (aka

TLS), the SSH2 protocol does not require hierarchical certificates signed by a

powerful central authority. You may know SSH2 as the protocol that replaced

telnet and rsh for secure access to remote shells, but the protocol also

includes the ability to open arbitrary channels to remote services across an

encrypted tunnel (this is how sftp works, for example).

CVE-2022-24302: Creation of new private key files using `~paramiko.pkey.PKey`

subclasses was subject to a race condition between file creation and mode

modification, which could be exploited by an attacker with knowledge of where

the Paramiko-using code would write out such files; this has been patched by

using `os.open` and `os.fdopen` to ensure new files are opened with the correct

mode immediately (we've left the subsequent explicit 'chmod' in place to

minimize any possible disruption, though it may get removed in future

backwards-incompatible updates).

* Sat Mar 19 2022 Paul Howarth - 2.10.3-1

- Update to 2.10.3

- Certificate-based pubkey auth was inadvertently broken when adding SHA2

support in version 2.9.0 (GH#1963, GH#1977)

- Switch from module-global to thread-local storage when recording thread IDs

for a logging helper; this should avoid one flavor of memory leak for

long-running processes (GH#2002, GH#2003)

* Tue Mar 15 2022 Paul Howarth - 2.10.2-1

- Update to 2.10.2

- Fix Python 2 compatibility breakage introduced in 2.10.1 (GH#2001)

- Re-enable sftp tests, no longer failing under mock

* Sun Mar 13 2022 Paul Howarth - 2.10.1-1

- Update to 2.10.1

- CVE-2022-24302: Creation of new private key files using

'~paramiko.pkey.PKey' subclasses was subject to a race condition between

file creation and mode modification, which could be exploited by an

attacker with knowledge of where the Paramiko-using code would write out

such files; this has been patched by using 'os.open' and 'os.fdopen' to

ensure new files are opened with the correct mode immediately (we've left

the subsequent explicit 'chmod' in place to minimize any possible

disruption, though it may get removed in future backwards-incompatible

updates)

- Add support for the '%C' token when parsing SSH config files (GH#1976)

- Add support for OpenSSH's Windows agent as a fallback when Putty/WinPageant

isn't available or functional (GH#1509, GH#1837, GH#1868)

- Significantly speed up low-level read/write actions on

'~paramiko.sftp_file.SFTPFile' objects by using 'bytearray'/'memoryview'

(GH#892); this is unlikely to change anything for users of the higher level

methods like 'SFTPClient.get' or 'SFTPClient.getfo', but users of

'SFTPClient.open' will likely see orders of magnitude improvements for

files larger than a few megabytes in size

- Add 'six' explicitly to install-requires; it snuck into active use at some

point but has only been indicated by transitive dependency on 'bcrypt'

until they somewhat-recently dropped it (GH#1985); this will be short-lived

until we drop Python 2 support

* Fri Jan 21 2022 Fedora Release Engineering - 2.9.2-3

- Rebuilt for https://fedoraproject.org/wiki/Fedora_36_Mass_Rebuild

* Fri Jan 14 2022 Paul Howarth - 2.9.2-2

- Avoid use of deprecated python-mock by using unittest.mock instead

https://github.com/paramiko/paramiko/pull/1666

* Sat Jan 8 2022 Paul Howarth - 2.9.2-1

- Update to 2.9.2

- Connecting to servers that support 'server-sig-algs' but which have no

overlap between that list and what a Paramiko client supports, now raise

an exception instead of defaulting to 'rsa-sha2-512' (since the use of

'server-sig-algs' allows us to know what the server supports)

- Enhanced log output when connecting to servers that do not support

'server-sig-algs' extensions, making the new-as-of-2.9 defaulting to SHA2

pubkey algorithms more obvious when it kicks in

[ 1 ] Bug #2065665 - CVE-2022-24302 python-paramiko: Race condition in the write_private_key_file function

https://bugzilla.redhat.com/show_bug.cgi?id=2065665

su -c 'dnf upgrade --advisory FEDORA-2022-8eb95d8611' at the command

line. For more information, refer to the dnf documentation available at

https://dnf.readthedocs.io/en/latest/command_ref.html

All packages are signed with the Fedora Project GPG key. More details on the

GPG keys used by the Fedora Project can be found at

https://fedoraproject.org/security/

package-announce mailing list -- package-announce@lists.fedoraproject.org

To unsubscribe send an email to package-announce-leave@lists.fedoraproject.org

Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/

List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines

List Archives: https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/

Do not reply to spam on the list, report it: https://pagure.io/fedora-infrastructure