Bug 1900055 (CVE-2020-28928) - CVE-2020-28928 musl: infinite loop in wcsnrtombs function
Summary: CVE-2020-28928 musl: infinite loop in wcsnrtombs function
Keywords:
Status: CLOSED UPSTREAM
Alias: CVE-2020-28928
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1900056
Blocks:
TreeView+ depends on / blocked
 
Reported: 2020-11-20 17:23 UTC by Guilherme de Almeida Suckevicz
Modified: 2020-11-20 23:33 UTC (History)
1 user (show)

Fixed In Version:
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Last Closed: 2020-11-20 23:33:53 UTC
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Description Guilherme de Almeida Suckevicz 2020-11-20 17:23:33 UTC 
The wcsnrtombs function in all musl libc versions up through 1.2.1 has been found to have multiple bugs in handling of destination buffer size when limiting the input character count, which can lead to infinite loop with no forward progress (no overflow) or writing past the end of the destination buffer.

Reference:
https://www.openwall.com/lists/oss-security/2020/11/20/4
Comment 1 Guilherme de Almeida Suckevicz 2020-11-20 17:23:48 UTC 
Created musl tracking bugs for this issue:

Affects: fedora-all [bug 1900056]
Comment 2 Product Security DevOps Team 2020-11-20 23:33:53 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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