CVE-2018-25032 log

Source	CVE Red Hat MITRE NVD Debian Ubuntu SUSE Alpine Mageia CVE Details CIRCL Bugs Arch Linux Red Hat Gentoo SUSE GitHub Lists oss-security full-disclosure bugtraq Misc GitHub code web search
Severity	High
Remote	Yes
Type	Arbitrary code execution
Description	An out-of-bounds access flaw was found in zlib before 1.2.12, which allows memory corruption when deflating (ex: when compressing) if the input has many distant matches. For some rare inputs with a large number of distant matches (crafted payloads), the buffer into which the compressed or deflated data is written can overwrite the distance symbol table which it overlays. This issue results in corrupted output due to invalid distances, which leads to out-of-bound access, corrupting the memory and crashing the application or potentially execute arbitrary code.

Group	Package	Affected	Fixed	Severity	Status	Ticket
AVG-2657	zlib	1:1.2.11-1	1:1.2.12-1	High	Fixed

Date	Advisory	Group	Package	Severity	Type
04 Apr 2022	ASA-202204-3	AVG-2657	zlib	High	arbitrary code execution

References
https://github.com/madler/zlib/commit/5c44459c3b28a9bd3283aaceab7c615f8020c531 https://github.com/madler/zlib/issues/605 https://www.openwall.com/lists/oss-security/2022/03/24/1 https://www.openwall.com/lists/oss-security/2022/03/26/1

References

https://github.com/madler/zlib/commit/5c44459c3b28a9bd3283aaceab7c615f8020c531
https://github.com/madler/zlib/issues/605
https://www.openwall.com/lists/oss-security/2022/03/24/1
https://www.openwall.com/lists/oss-security/2022/03/26/1

Notes
This bug was introduced in zlib v1.2.2.2 through zlib v1.2.11, with the addition of the Z_FIXED option, which forces the use of fixed Huffman codes, rather than dynamic Huffman codes, allowing for a simpler decoder for special applications. This bug is difficult to trigger, as Z_FIXED is usually only used in special circumstances. Rsync does the compression in-transit using zlib. As rsync uses vulnerable zlib v1.2.8 package, which incorrectly handles memory when performing certain zlib compressing or deflating operations. This results in rsync to crash.

Notes

This bug was introduced in zlib v1.2.2.2 through zlib v1.2.11, with the addition of the Z_FIXED option, which forces the use of fixed Huffman codes, rather than dynamic Huffman codes, allowing for a simpler decoder for special applications.

This bug is difficult to trigger, as Z_FIXED is usually only used in special circumstances.

Rsync does the compression in-transit using zlib. As rsync uses vulnerable zlib v1.2.8 package, which incorrectly handles memory when performing certain zlib compressing or deflating operations. This results in rsync to crash.