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Bug 1740464 (CVE-2019-14274) - CVE-2019-14274 mcpp: heap based buffer overflow in function do_msg() in support.c
Summary: CVE-2019-14274 mcpp: heap based buffer overflow in function do_msg() in suppo...
Status: NEW
Alias: CVE-2019-14274
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
Depends On: 1740465 1743382
Blocks: 1740467
TreeView+ depends on / blocked
Reported: 2019-08-13 04:44 UTC by Dhananjay Arunesh
Modified: 2021-02-16 21:30 UTC (History)
3 users (show)

Fixed In Version:
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Description Dhananjay Arunesh 2019-08-13 04:44:49 UTC
A vulnerability was found in MCPP 2.7.2 has a heap-based buffer overflow in the do_msg() function in


Comment 1 Dhananjay Arunesh 2019-08-13 04:45:04 UTC
Created mcpp tracking bugs for this issue:

Affects: fedora-all [bug 1740465]

Comment 3 Marco Benatto 2019-08-19 15:49:34 UTC
External References:


Comment 6 Marco Benatto 2019-08-19 19:01:40 UTC
When mcpp application found multibyte characters when parsing the input file, it tries to show warning messages. The messages are shown via cwarn() function which further calls do_msg() with the error message itself formatted in printf-like format. The buffer containing the multibyte sequence is also passed as parameter for do_msg() which doesn't handle it gracefully. This causes a buffer overflow to happening during the output message formation, the overflow may cause low integrity and confidentiality impacts and eventually may lead to invalid memory access causing DoS.

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