REDHAT-BUG-1768750: Buffer Overflow
First published: Tue Nov 05 2019(Updated: )
A stack buffer overflow in the fribidi_get_par_embedding_levels_ex() function in lib/fribidi-bidi.c of GNU FriBidi 1.0.0 through 1.0.7 allows an attacker to cause a denial of service or possibly execute arbitrary code by delivering crafted text content to a user, when this content is then rendered by an application that uses FriBidi for text layout calculations. Examples include any GNOME or GTK+ based application that uses Pango for text rendering, as this internally uses FriBidi for bidirectional text layout. For example, the attacker can construct a crafted text file to be opened in GEdit, a crafted IRC message to be viewed in HexChat or a crafted email to be viewed in Evolution.
| Affected Software | Affected Version | How to fix |
|---|---|---|
| libfribidi0 | >=1.0.0<=1.0.7 |
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Reference Links
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1781219
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1781218
- https://github.com/fribidi/fribidi/commit/034c6e9a1d296286305f4cfd1e0072b879f52568
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1768750#c0
- https://github.com/fribidi/fribidi/commit/d989590e124ad995de3598800c8835d819fadf80
- https://access.redhat.com/errata/RHSA-2019:4326
- https://access.redhat.com/security/cve/cve-2019-18397
- https://access.redhat.com/errata/RHSA-2019:4361
- https://access.redhat.com/errata/RHSA-2020:0291
- https://bugzilla.redhat.com/show_bug.cgi?id=1768750
Frequently Asked Questions
What is the severity of REDHAT-BUG-1768750?
The severity of REDHAT-BUG-1768750 is high due to the potential for denial of service and arbitrary code execution.
How do I fix REDHAT-BUG-1768750?
To fix REDHAT-BUG-1768750, upgrade GNU FriBidi to version 1.0.8 or later.
What type of vulnerability is REDHAT-BUG-1768750?
REDHAT-BUG-1768750 is classified as a stack buffer overflow vulnerability.
Which versions of GNU FriBidi are affected by REDHAT-BUG-1768750?
GNU FriBidi versions 1.0.0 through 1.0.7 are affected by REDHAT-BUG-1768750.
What could an attacker achieve by exploiting REDHAT-BUG-1768750?
An attacker could achieve denial of service or potentially execute arbitrary code by exploiting REDHAT-BUG-1768750.
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