CVE-2024-4741

Name	CVE-2024-4741
Description	Issue summary: Calling the OpenSSL API function SSL_free_buffers may cause memory to be accessed that was previously freed in some situations Impact summary: A use after free can have a range of potential consequences such as the corruption of valid data, crashes or execution of arbitrary code. However, only applications that directly call the SSL_free_buffers function are affected by this issue. Applications that do not call this function are not vulnerable. Our investigations indicate that this function is rarely used by applications. The SSL_free_buffers function is used to free the internal OpenSSL buffer used when processing an incoming record from the network. The call is only expected to succeed if the buffer is not currently in use. However, two scenarios have been identified where the buffer is freed even when still in use. The first scenario occurs where a record header has been received from the network and processed by OpenSSL, but the full record body has not yet arrived. In this case calling SSL_free_buffers will succeed even though a record has only been partially processed and the buffer is still in use. The second scenario occurs where a full record containing application data has been received and processed by OpenSSL but the application has only read part of this data. Again a call to SSL_free_buffers will succeed even though the buffer is still in use. While these scenarios could occur accidentally during normal operation a malicious attacker could attempt to engineer a stituation where this occurs. We are not aware of this issue being actively exploited. The FIPS modules in 3.3, 3.2, 3.1 and 3.0 are not affected by this issue.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DLA-3942-1
Debian Bugs	1072113

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
openssl (PTS)	jessie, jessie (lts)	1.0.1t-1+deb8u21	fixed
	stretch (security)	1.1.0l-1~deb9u6	fixed
	stretch (lts), stretch	1.1.0l-1~deb9u9	fixed
	buster (security), buster, buster (lts)	1.1.1n-0+deb10u6	vulnerable
	bullseye	1.1.1w-0+deb11u1	fixed
	bullseye (security)	1.1.1w-0+deb11u2	fixed
	bookworm	3.0.15-1~deb12u1	fixed
	bookworm (security)	3.0.14-1~deb12u2	fixed
	sid, trixie	3.3.2-2	fixed
openssl1.0 (PTS)	stretch (security)	1.0.2u-1~deb9u7	fixed
	stretch (lts), stretch	1.0.2u-1~deb9u9	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Origin	Debian Bugs
openssl	source	jessie	(not affected)
openssl	source	stretch	(not affected)
openssl	source	bullseye	1.1.1n-0+deb11u6	DLA-3942-1
openssl	source	bookworm	3.0.14-1~deb12u1
openssl	source	(unstable)	3.2.2-1		1072113
openssl1.0	source	(unstable)	(not affected)

Notes

[buster] - openssl <postponed> (Minor issue, fix along with next update round)
https://www.openssl.org/news/secadv/20240528.txt
https://github.com/openssl/openssl/commit/c1bd38a003fa19fd0d8ade85e1bbc20d8ae59dab (master)
https://github.com/openssl/openssl/commit/c88c3de51020c37e8706bf7a682a162593053aac (openssl-3.2)
https://github.com/openssl/openssl/commit/b3f0eb0a295f58f16ba43ba99dad70d4ee5c437d (openssl-3.0)
[stretch] - openssl <not-affected> (Vulnerable code introduced later)
[jessie] - openssl <not-affected> (Vulnerable code introduced later)
- openssl1.0 <not-affected> (Vulnerable code not present)