Debian Bug report logs -
#968366
libproxy: CVE-2020-26154: buffer overflow when PAC is enabled
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Bug#968366
; Package src:libproxy
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(Thu, 13 Aug 2020 15:39:03 GMT) (full text, mbox, link).
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New Bug report received and forwarded. Copy sent to team@security.debian.org, Debian GNOME Maintainers <pkg-gnome-maintainers@lists.alioth.debian.org>
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(Thu, 13 Aug 2020 15:39:03 GMT) (full text, mbox, link).
Message #5 received at submit@bugs.debian.org (full text, mbox, reply):
Source: libproxy
Version: 0.4.14-2
Severity: grave
Justification: user security hole
Tags: security upstream
Forwarded: https://github.com/libproxy/libproxy/pull/126
X-Debbugs-Cc: Debian Security Team <team@security.debian.org>
Li Fei (@lifeibiren on Github) reported that if the server serving a PAC
file sends more than 102400 bytes without a Content-Length present,
libproxy can overflow its buffer by PAC_HTTP_BLOCK_SIZE (512) bytes.
This PR is said to fix it, although I have not reviewed it in detail, and
it would be better if someone who knows C++ better than me did the review:
https://github.com/libproxy/libproxy/pull/126
Thanks to Michael Catanzaro for highlighting this as likely to be a
security vulnerability during a more general conversation about libproxy.
(Please reduce severity as desired if this is succesfully mitigated by
some security measure - I'm assuming stack smashing is arbitrary code
execution, but maybe it's just DoS.)
From source code inspection, versions >= 0.4.14-2 in stretch appear
to be vulnerable. 0.4.11-4 in jessie does not appear to be vulnerable,
because it assumes absence of Content-Length means a length of 0 (which
is a bug, but not a security bug). Intermediate versions between jessie
and stretch not checked.
smcv
Changed Bug title to 'libproxy: CVE-2020-26154: buffer overflow when PAC is enabled' from 'libproxy#126: buffer overflow when PAC is enabled'.
Request was from Salvatore Bonaccorso <carnil@debian.org>
to control@bugs.debian.org
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(Wed, 30 Sep 2020 04:09:02 GMT) (full text, mbox, link).
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