REDHAT-BUG-1647043: Double Free
First published: Tue Nov 06 2018(Updated: )
An issue was discovered in GNU gettext 0.19.8. There is a double free in default_add_message in read-catalog.c, related to an invalid free in po_gram_parse in po-gram-gen.y, as demonstrated by lt-msgfmt. References: <a href="https://github.com/CCCCCrash/POCs/tree/master/Bin/Tools-gettext-0.19.8.1/doublefree">https://github.com/CCCCCrash/POCs/tree/master/Bin/Tools-gettext-0.19.8.1/doublefree</a> <a href="https://github.com/CCCCCrash/POCs/tree/master/Bin/Tools-gettext-0.19.8.1/heapcorruption">https://github.com/CCCCCrash/POCs/tree/master/Bin/Tools-gettext-0.19.8.1/heapcorruption</a>
| Affected Software | Affected Version | How to fix |
|---|---|---|
| gettext |
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Reference Links
- https://github.com/CCCCCrash/POCs/tree/master/Bin/Tools-gettext-0.19.8.1/doublefree
- https://github.com/CCCCCrash/POCs/tree/master/Bin/Tools-gettext-0.19.8.1/heapcorruption
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1647044
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1647045
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1647047
- https://access.redhat.com/errata/RHSA-2019:3643
- https://access.redhat.com/security/cve/cve-2018-18751
- https://access.redhat.com/errata/RHSA-2020:1138
- https://access.redhat.com/errata/RHSA-2020:2485
- https://access.redhat.com/errata/RHSA-2020:2846
- https://bugzilla.redhat.com/show_bug.cgi?id=1647043
Frequently Asked Questions
What is the severity of REDHAT-BUG-1647043?
The severity of REDHAT-BUG-1647043 is classified as moderate due to the potential for a double free vulnerability.
How do I fix REDHAT-BUG-1647043?
To fix REDHAT-BUG-1647043, update to the latest version of GNU gettext that addresses the double free issue.
What systems are affected by REDHAT-BUG-1647043?
REDHAT-BUG-1647043 affects systems using GNU gettext 0.19.8 and earlier versions.
Is there a known exploit for REDHAT-BUG-1647043?
Yes, there are proofs of concept available that demonstrate the exploitation of the double free vulnerability in GNU gettext 0.19.8.
What should I do if I cannot update GNU gettext to fix REDHAT-BUG-1647043?
If an update is not possible, consider mitigating the risk by restricting access to the affected software or disabling its use until a patch can be applied.
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