CVE-2017-8846 - Use After Free

Severity

43%

Complexity

86%

Confidentiality

48%

The read_stream function in stream.c in liblrzip.so in lrzip 0.631 allows remote attackers to cause a denial of service (use-after-free and application crash) via a crafted archive.

The read_stream function in stream.c in liblrzip.so in lrzip 0.631 allows remote attackers to cause a denial of service (use-after-free and application crash) via a crafted archive.

CVSS 3.0 Base Score 5.5. CVSS Attack Vector: local. CVSS Attack Complexity: low. CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H).

CVSS 2.0 Base Score 4.3. CVSS Attack Vector: network. CVSS Attack Complexity: medium. CVSS Vector: (AV:N/AC:M/Au:N/C:N/I:N/A:P).

Demo Examples

Use After Free

CWE-416

The following example demonstrates the weakness.


               
}
free(buf3R2);

Use After Free

CWE-416

The following code illustrates a use after free error:


               
}
free(ptr);
logError("operation aborted before commit", ptr);

When an error occurs, the pointer is immediately freed. However, this pointer is later incorrectly used in the logError function.

Overview

First reported 7 years ago

2017-05-08 14:29:00

Last updated 4 years ago

2020-05-13 01:15:00

Affected Software

lrzip Project lrzip 0.631

0.631

References

https://blogs.gentoo.org/ago/2017/05/07/lrzip-use-after-free-in-read_stream-stream-c/

Third Party Advisory, VDB Entry

https://github.com/ckolivas/lrzip/issues/71

Issue Tracking, Patch, Third Party Advisory

GLSA-202005-01

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