Bug 1899520 (CVE-2020-25725) - CVE-2020-25725 xpdf: sending crafted a PDF document to the pdftops tool could result in DoS
Summary: CVE-2020-25725 xpdf: sending crafted a PDF document to the pdftops tool could...
Keywords:
Status: CLOSED UPSTREAM
Alias: CVE-2020-25725
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1899521 1899522 1899523
Blocks:
TreeView+ depends on / blocked
 
Reported: 2020-11-19 13:28 UTC by Michael Kaplan
Modified: 2021-02-17 19:31 UTC (History)
2 users (show)

Fixed In Version:
Doc Type: ---
Doc Text:
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.
Clone Of:
Environment:
Last Closed: 2020-11-19 17:28:49 UTC
Embargoed:

Attachments (Terms of Use)

Description Michael Kaplan 2020-11-19 13:28:55 UTC 
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.
Comment 1 Michael Kaplan 2020-11-19 13:28:58 UTC 
Acknowledgments:

Name: Mike Zhang (Pangu Lab)
Comment 2 Michael Kaplan 2020-11-19 13:29:00 UTC 
External References:

https://forum.xpdfreader.com/viewtopic.php?f=3&t=41915
Comment 3 Michael Kaplan 2020-11-19 13:30:47 UTC 
Created xpdf tracking bugs for this issue:

Affects: epel-6 [bug 1899523]
Affects: epel-7 [bug 1899522]
Affects: fedora-all [bug 1899521]
Comment 4 Product Security DevOps Team 2020-11-19 17:28:49 UTC 
This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.
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