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---
name: IRSSI-SA-2016
heading: heap corruption and missing boundary checks
release_date: 2016-09-14
git_commit: 295a4b77f07f14602eeaa371f00ddbf09910c82b
bugs:
-
cve: CVE-2016-7044
cwe: CWE-20, CWE-823, CWE-126, CWE-122
exploitable_by: client
affected_versions:
from: 0.8.17
to: 0.8.19
affected_note_bottom: '(with truecolor)'
affected_note_long: only when compiled with true-color enabled.
fixed_version: 0.8.20
credit: 'Gabriel Campana and Adrien Guinet from Quarkslab'
description: 'Remote crash and heap corruption in format parsing code'
discussion: >
Bug 1
The unformat_24bit_color() function is called by format_send_to_gui()
to decode 24bit color codes into their components. The pointer is
advanced unconditionally without checking if a complete code was
supplied.
Thus, after the return of unformat_24bit_color(), ptr might be invalid
and point out of the buffer.
-
cve: CVE-2016-7045
cwe: CWE-20, CWE-823, CWE-126, CWE-122
exploitable_by: client
affected_versions:
from: 0.8.17
to: 0.8.19
fixed_version: 0.8.20
credit: 'Gabriel Campana and Adrien Guinet from Quarkslab'
description: 'Remote crash and heap corruption in format parsing code'
discussion: >
Bug 2
The format_send_to_gui() function does not validate the length of the
string before incrementing the `ptr' pointer in all cases.
If that happens, the pointer `ptr' can be incremented twice and thus
end past the boundaries of the original `dup' buffer.
description: >
Gabriel Campana and Adrien Guinet from Quarkslab reported two remote
crash and heap corruption vulnerabilites in Irssi's format parsing
code.
They also provided us with proof of concept exploit code and patches
to fix those issues.
impact: >
Remote crash and heap corruption. Remote code execution seems
difficult since only Nuls are written.
recommended_action: >
Upgrade to Irssi 0.8.20. Irssi 0.8.20 is a maintenance release
without any new features.
After installing the updated packages, one can issue the /upgrade
command to load the new binary. TLS connections will require
/reconnect.
extra2:
- title: Fallback action
text: >
Distributions which need to remain on Irssi 0.8.17 are strongly urged
to apply the patch and provide updated packages.
Those who cannot upgrade right now, but with Perl support enabled in
their Irssi, can load the following script and add it to
~/.irssi/scripts/autorun as a first aid to mitigating these issues:
https://irssi.org/security/sa_patch.pl
discussion: >
Based on analysis Provided by Gabriel Campana and Adrien Guinet from
Quarkslab.
---
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