A buffer overflow in the fribidi_get_par_embedding_levels_ex() function in lib/fribidi-bidi.c of GNU FriBidi 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 layout, as this internally uses FriBidi for bidirectional text layout. For example, the attacker can construct a crafted text file to be opened in GEdit, or a crafted IRC message to be viewed in HexChat.
The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow.
| Link | Tags |
|---|---|
| https://github.com/fribidi/fribidi/commit/034c6e9a1d296286305f4cfd1e0072b879f52568 | patch |
| https://marc.info/?l=oss-security&m=157322128105807&w=2 | third party advisory |
| https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=944327 | issue tracking third party advisory |
| https://security-tracker.debian.org/tracker/CVE-2019-18397 | third party advisory |
| https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/W5UJRTG32FDNI7T637Q6PZYL3UCRR5HR/ | vendor advisory |
| https://access.redhat.com/errata/RHSA-2019:4326 | vendor advisory |
| https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TFS3N6KKXPI6ATDNEUFRSLX7R6BOBNIP/ | vendor advisory |
| https://access.redhat.com/errata/RHSA-2019:4361 | vendor advisory |
| https://access.redhat.com/errata/RHSA-2020:0291 | vendor advisory |
| https://security.gentoo.org/glsa/202003-41 | vendor advisory |