CVE-2020-25725

Description

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.

Related CPE's

a xpdfreader xpdf 4.02 *******

References

https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-25725

Exploit

Issue Tracking

Third Party Advisory

https://forum.xpdfreader.com/viewtopic.php?f=3&t=41915

Exploit

Vendor Advisory

CvssV3 impact

BaseSeverity

MEDIUM

ConfidentialityImpact

NONE

AttackComplexity

LOW

Scope

UNCHANGED

AttackVector

LOCAL

AvailabilityImpact

HIGH

IntegrityImpact

NONE

PrivilegesRequired

NONE

BaseScore

5.5

VectorString

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Version

3.1

UserInteraction

REQUIRED

CvssV2 impact

AccessComplexity

MEDIUM

ConfidentialityImpact

NONE

AvailabilityImpact

PARTIAL

IntegrityImpact

NONE

BaseScore

4.3

VectorString

AV:N/AC:M/Au:N/C:N/I:N/A:P

Version

2.0

AccessVector

NETWORK

Authentication

NONE