CVE-2020-25725: Use After Free
First published: Sat Nov 21 2020(Updated: )
In Xpdf 4.02, SplashOutputDev::endType3Char(GfxState *state) SplashOutputDev.cc:3079 is trying to use the freed `t3GlyphStack->cache`, which causes an `heap-use-after-free` problem. The codes of a previous fix for nested Type 3 characters wasn't correctly handling the case where a Type 3 char referred to another char in the same Type 3 font.
Credit: secalert@redhat.com secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Xpdfreader Xpdf | =4.02 | |
| Fedoraproject Fedora | =32 | |
| Fedoraproject Fedora | =33 |
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Reference Links
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-25725
- https://forum.xpdfreader.com/viewtopic.php?f=3&t=41915
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4ZUU5QG6SSVRTKZTR3A72LDRVZETEI63/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VLOYVJSM54IL6I5RY4QTJGRS7PIEG44X/
Frequently Asked Questions
What is CVE-2020-25725?
CVE-2020-25725 is a vulnerability in Xpdf 4.02 that causes a heap-use-after-free problem.
What software is affected by CVE-2020-25725?
Xpdf 4.02 and Fedora 32 and 33 are affected by CVE-2020-25725.
What is the severity of CVE-2020-25725?
The severity of CVE-2020-25725 is medium with a score of 5.5.
How can I fix CVE-2020-25725?
Upgrade Xpdf to a version that has the fix, and apply the latest updates for Fedora.
Where can I find more information about CVE-2020-25725?
You can find more information about CVE-2020-25725 at the provided references.
- collector/nvd-api
- agent/references
- agent/author
- agent/type
- agent/softwarecombine
- collector/nvd-index
- agent/software-canonical-lookup
- collector/mitre-cve
- source/MITRE
- agent/severity
- agent/weakness
- agent/last-modified-date
- agent/description
- agent/first-publish-date
- agent/event
- agent/tags
- agent/source
- vendor/xpdfreader
- canonical/xpdfreader xpdf
- version/xpdfreader xpdf/4.02
- vendor/fedoraproject
- canonical/fedoraproject fedora
- version/fedoraproject fedora/32
- version/fedoraproject fedora/33