This bug was fixed in the package apt - 2.1.10ubuntu0.3
---------------
apt (2.1.10ubuntu0.3) groovy; urgency=medium
[ David Kalnischkies ]
* Fix incorrect base64 encoding due to int promotion (LP: #1916050)
* Harden test for no new acquires after transaction abort (Closes: #984966)
(LP: #1918920)
[ Julian Andres Klode ]
* Implement update --error-on=any (Closes: #594813) (LP: #1693900)
* Include all translations when building the cache (LP: #1907850)
* Do not require force-loopbreak on Protected packages (Closes: #983014)
(LP: #1916725)
* RunScripts: Do not reset SIGQUIT and SIGINT to SIG_DFL (LP: #1898026)
* Protect currently running kernel at run-time (LP: #1615381)
* Make ADDARG{,C}() macros expand to single statements
-- Julian Andres Klode <juli...@ubuntu.com> Fri, 12 Mar 2021 09:22:11
+0100
** Changed in: apt (Ubuntu Groovy)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1916050
Title:
Invalid base64 for high-bit characters
Status in apt package in Ubuntu:
Fix Released
Status in apt source package in Xenial:
Confirmed
Status in apt source package in Bionic:
Fix Committed
Status in apt source package in Focal:
Fix Committed
Status in apt source package in Groovy:
Fix Released
Status in apt source package in Hirsute:
Fix Released
Bug description:
[Impact]
The Base64Encode function incorrectly encodes using char instead of uint8_t,
leading to characters with the high bit set to be encoded wrongly. This
function is used for base authentication, and high bits are set for UTF-8
character sequences, so it's likely affecting people with utf-8 user names and
passwords and might cause them to be denied access to their https resources
(though arguably they'd work around that).
[Test case]
A unit test has been added that checks that the encoding is correct.
[Where problems could occur]
This only affects the base64 encoding function, which is only used for
quoting user names and passwords in basic auth in http, but it's also exposed
to library users and like in python-apt, so problems could occur wherever they
use that base64 encoding function as well.
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